TY - CPAPER AU - Asahi, H., Mix, A.C., Suto, I., Belanger, C.L., Fukumura, A., Gupta, S., Konno, S., Matsuzaki, K.M., Romero, O.E., Gulick, S.P.S., Jaeger, J.M., and Schneider, L.J. CY - San Francisco, CA DA - 15–19 December 2014 N1 - Abstract PP21A-1286 PY - 2014 T2 - 2014 American Geophysical Union Fall Meeting TI - Oxygen isotope stratigraphy in the Gulf of Alaska (IODP Exp. 341) UR - https://abstractsearch.agu.org/meetings/2014/FM/PP21A-1286.html ID - 15429 ER - TY - CPAPER AU - Asahi, H., Mix, A.C., Suto, I., Gulick, S.P.S., Jaeger, J.M., LeVay, L., and Nam, S.I. CY - San Francisco, CA DA - 11–15 December 2016 N1 - Abstract T44B-08 PY - 2016 T2 - 2016 American Geophysical Union Fall Meeting TI - Orbital scale oxygen isotope stratigraphy at Sites U1417 and U1418 in the Gulf of Alaska (IODP Exp. 341) UR - https://abstractsearch.agu.org/meetings/2016/FM/T44B-08.html ID - 15455 ER - TY - CPAPER AU - Babin, D.P., Hemming, S.R., Simon, M., Hall, I.R., Franzese, A.M., Goldstein, S.L., Cai, Y., Johns, M.A., Tejada, L., LeVay, L., and the Expedition 361 Science Party CY - New Orleans, LA DA - 11– December 2017 PY - 2017 T2 - American Geophysical Union Fall Meeting TI - Terrigenous provenance follows climate variability at IODP Site U1474, southwestern Indian Ocean UR - https://abstractsearch.agu.org/meetings/2017/FM/PP34B-06.html ID - 49141 ER - TY - CHAP A2 - Hall, I.R., Hemming, S.R., LeVay, L.J., and the Expedition 361 Scientists AU - Babin, D.P., Franzese, A.M., Hemming, S.R., Hall, I.R., LeVay, L.J., Barker, S., Tejeda, L., Simon, M.H., and the Expedition 361 Scientists CY - College Station, TX PB - International Ocean Discovery Program PY - 2020 ST - Data report: X-ray fluorescence core scanning of IODP Site U1474 sediments, Natal Valley, Southwest Indian Ocean, Expedition 361 SV - Proceedings of the International Ocean Discovery Program T2 - South African Climates (Agulhas LGM Density Profile) TI - Data report: X-ray fluorescence core scanning of IODP Site U1474 sediments, Natal Valley, Southwest Indian Ocean, Expedition 361 UR - https://doi.org/10.14379/iodp.proc.361.201.2020 VL - 361 ID - 7650 ER - TY - JOUR AB - Prior to ~1 million years ago (Ma), variations in global ice volume were dominated by changes in obliquity; however, the role of precession remains unresolved. Using a record of North Atlantic ice rafting spanning the past 1.7 million years, we find that the onset of ice rafting within a given glacial cycle (reflecting ice sheet expansion) consistently occurred during times of decreasing obliquity whereas mass ice wasting (ablation) events were consistently tied to minima in precession. Furthermore, our results suggest that the ubiquitous association between precession-driven mass wasting events and glacial termination is a distinct feature of the mid to late Pleistocene. Before then, (increasing) obliquity alone was sufficient to end a glacial cycle, before losing its dominant grip on deglaciation with the southward extension of Northern Hemisphere ice sheets since ~1 Ma. Before about 1.25 million years ago, glacial cycles reflected the 40,000-year obliquity insolation cycle, whereas over the past 800 thousand years, glacial cycles have been paced by the 100,000-year eccentricity cycle. What about the role of the 23,000-year cycle of precession? Barker et al. present a 1.7-million-year record showing that glacial termination has depended mostly on precession for the past million years. That change seems to be a function of ice sheet size. —HJS Precession has driven northern hemispheric ice sheet decay since the start of the Middle Pleistocene transition. AU - Barker, Stephen AU - Starr, Aidan AU - van der Lubbe, Jeroen AU - Doughty, Alice AU - Knorr, Gregor AU - Conn, Stephen AU - Lordsmith, Sian AU - Owen, Lindsey AU - Nederbragt, Alexandra AU - Hemming, Sidney AU - Hall, Ian AU - Levay, Leah AU - Berke, M. A. AU - Brentegani, L. AU - Caley, T. AU - Cartagena-Sierra, A. AU - Charles, C. D. AU - Coenen, J. J. AU - Crespin, J. G. AU - Franzese, A. M. AU - Gruetzner, J. AU - Han, X. AU - Hines, S. K. V. AU - Jimenez Espejo, F. J. AU - Just, J. AU - Koutsodendris, A. AU - Kubota, K. AU - Lathika, N. AU - Norris, R. D. AU - Periera dos Santos, T. AU - Robinson, R. AU - Rolison, J. M. AU - Simon, M. H. AU - Tangunan, D. AU - Yamane, M. AU - Zhang, H. DO - doi:10.1126/science.abm4033 IS - 6596 N1 - https://www.science.org/doi/abs/10.1126/science.abm4033 PY - 2022 SP - 961–967 ST - Persistent influence of precession on northern ice sheet variability since the early Pleistocene T2 - Science TI - Persistent influence of precession on northern ice sheet variability since the early Pleistocene UR - https://doi.org/10.1126/science.abm4033 VL - 376 ID - 48833 ER - TY - CPAPER AU - Barnes, P., Saffer, D.M., Wallace, L.M., Pecher, I.A., Petronotis, K.E., and LeVay, L. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Drilling and coring the northern Hikurangi subduction margin to unlock the secrets of slow slip UR - https://abstractsearch.agu.org/meetings/2018/FM/T54C-03.html ID - 14707 ER - TY - CPAPER AU - Barnes, P., Gamboa, D., Bell, R.E., Moore, G.F., Mountjoy, J.J., Paganoni, M., Clennell, M.B., Cook, A., McNamara, D.D., Underwood, M., Rabinowitz, H., Noda, A., Meneghini, F., Kutterolf, S., Hashimoto, Y., Engelmann de Oliveira, C., Pecher, I.A., Wallace, L.M., Saffer, D.M., LeVay, L.J., Petronotis, K.E., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Revisiting the giant Ruatoria debris flow on the Hikurangi margin, New Zealand: results from IODP Expeditions 372 and 375, Site U1520 UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0310.html ID - 14708 ER - TY - JOUR AB - International Ocean Discovery Program (IODP) Expedition 372 combines two research topics, slow slip events (SSEs) on subduction faults (IODP Proposal 781A-Full) and actively deforming gas hydrate-bearing landslides (Proposal 841-APL). Our study area on the Hikurangi margin east of New Zealand provides unique locations for addressing both research topics. Gas hydrates have long been suspected of being involved in seafloor failure; not much evidence, however, has been found to date for gas hydrate-related submarine landslides. Solid, icelike gas hydrate in sediment pores is generally thought to increase seafloor strength, as confirmed by a number of laboratory measurements. Dissociation of gas hydrate to water and overpressured gas, on the other hand, may destabilize the seafloor, potentially causing submarine landslides. The Tuaheni Landslide Complex on the Hikurangi margin shows evidence for active, creeping deformation. Intriguingly, the landward edge of creeping coincides with the pinchout of the base of gas hydrate stability (BGHS) on the seafloor. We therefore hypothesize that gas hydrate may be linked to creeping by (1) repeated small-scale sliding at the BGHS, in a variation of the conventional model linking gas hydrates and seafloor failure; (2) overpressure at the BGHS due to a permeability reduction linked to gas hydrates, which may lead to hydrofracturing, weakening the seafloor and allowing transmission of pressure into the gas hydrate stability zone; or (3) icelike viscous deformation of gas hydrates in sediment pores, similar to onshore rock glaciers. The latter two processes imply that gas hydrate itself is involved in creeping, constituting a paradigm shift in relating gas hydrates to submarine slope failure. Alternatively, creeping may not be related to gas hydrates but instead be caused by repeated pressure pulses or linked to earthquake-related liquefaction. We have devised a coring and logging program to test our hypotheses. SSEs at subduction zones are an enigmatic form of creeping fault behavior. At the northern Hikurangi subduction margin (HSM), they are among the best-documented and shallowest on Earth. They recur about every 2 y and may extend close to the trench, where clastic and pelagic sediments about 1.0-1.5 km thick overlie the subducting, seamount-studded Hikurangi Plateau. The northern HSM thus provides an excellent setting to use IODP capabilities to discern the mechanisms behind slow slip fault behavior, as proposed in IODP Proposal 781A-Full. The objectives of Proposal 781A-Full will be implemented across two related IODP expeditions, 372 and 375. Expedition 372 will undertake logging while drilling (LWD) at three sites targeting the upper plate (midslope basin, proposed Site HSM-01A), the frontal thrust (proposed Site HSM-18A), and the subducting section in the trench (proposed Site HSM-05A). Expedition 375 will undertake coring at the same sites, as well as an additional seamount site on the subducting plate, and implement the borehole observatory objectives. The data from each expedition will be shared between both scientific parties. Collectively, the LWD and coring data will be used to (1) characterize the compositional, structural, thermal, and diagenetic state of the incoming plate and the shallow plate boundary fault near the trench, which comprise the protolith and initial conditions for fault zone rock associated with SSEs at greater depth, and (2) characterize the material properties, thermal regime, and stress conditions in the upper plate above the SSE source region. These data will be used during Expedition 375 to guide the installation of CORK observatories at the frontal thrust and in the upper plate above the SSE source to monitor temporal variations in deformation, fluid flow, seismicity, and physical and chemical properties throughout the SSE cycle (Saffer et al., 2017). Together, these data will test a suite of hypotheses about the fundamental mechanics and behavior of SSEs and their relationship to great earthquakes along the subduction interface. AU - Barnes, Philip M. AU - Pecher, Ingo AU - LeVay, Leah J. J2 - Affiliation (analytic): National Institute of Water and Atmospheric Research, Wellington Coordinates: S384800 S384300 E1784600 E1783400 Contains 68 references Research Program: IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Scientific Prospectus (International Ocean Discovery Program), Vol.372, 59p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2332-1385 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2017043440 URL access: Open access DOI: 10.14379/iodp.sp.372.2017 KW - Australasia Australian Plate Boreholes Creep Crust Downhole methods Drilling Expedition 372 Failures Faults Gas hydrates Geophysical methods Geophysical profiles Geophysical surveys Hikurangi Margin International Ocean Discovery Program Marine drilling Marine sediments Mass movements Measurement-while-drilling New Zealand Oceanic crust Pacific Ocean Pacific Plate Planning Plate tectonics Pore pressure Reflection methods Sediments Seismic methods Seismic profiles Seismic stratigraphy Seismicity Slumping South Pacific Southwest Pacific Subduction Subduction zones Surveys Temperature West Pacific 07 Marine Geology and Oceanography 20 Geophysics, Applied LA - English PY - 2017 SN - 2332-1385 ; ST - Expedition 372 Scientific Prospectus: Creeping Gas Hydrate Slides and LWD for Hikurangi Subduction Margin. International Ocean Discovery Program TI - Expedition 372 Scientific Prospectus: Creeping Gas Hydrate Slides and LWD for Hikurangi Subduction Margin. International Ocean Discovery Program UR - https://doi.org/10.14379/iodp.sp.372.2017 ID - 5465 ER - TY - JOUR AB - Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust. AU - Barnes, Philip M. AU - Wallace, Laura M. AU - Saffer, Demian M. AU - Bell, Rebecca E. AU - Underwood, Michael B. AU - Fagereng, Ake AU - Meneghini, Francesca AU - Savage, Heather M. AU - Rabinowitz, Hannah S. AU - Morgan, Julia K. AU - Kitajima, Hiroko AU - Kutterolf, Steffen AU - Hashimoto, Yoshitaka AU - Engelmann de Oliveira, Christie H. AU - Noda, Atsushi AU - Crundwell, Martin P. AU - Shepherd, Claire L. AU - Woodhouse, Adam D. AU - Harris, Robert N. AU - Wang, Maomao AU - Henrys, Stuart AU - Barker, Daniel H.N. AU - Petronotis, Katerina E. AU - Bourlange, Sylvain M. AU - Clennell, Michael B. AU - Cook, Ann E. AU - Dugan, Brandon E. AU - Elger, Judith AU - Fulton, Patrick M. AU - Gamboa, Davide AU - Greve, Annika AU - Han, Shuoshuo AU - Hüpers, Andre AU - Ikari, Matt J. AU - Ito, Yoshihiro AU - Kim, Gil Young AU - Koge, Hiroaki AU - Lee, Hikweon AU - Li, Xuesen AU - Luo, Min AU - Malie, Pierre R. AU - Moore, Gregory F. AU - Mountjoy, Joshu J. AU - McNamara, David D. AU - Paganoni, Matteo AU - Screaton, Elizabeth J. AU - Shankar, Uma AU - Shreedharan, Srisharan AU - Solomon, Evan A. AU - Wang, Xiujuan AU - Wu, Hung-Yu AU - Pecher, Ingo A. AU - LeVay, Leah J. DO - 10.1126/sciadv.aay3314 IS - 13 N1 - https://advances.sciencemag.org/content/advances/6/13/eaay3314.full.pdf Barnes, Philip M. Wallace, Laura M. Saffer, Demian M. Bell, Rebecca E. Underwood, Michael B. Fagereng, Ake Meneghini, Francesca Savage, Heather M. Rabinowitz, Hannah S. Morgan, Julia K. Kitajima, Hiroko Kutterolf, Steffen Hashimoto, Yoshitaka Engelmann de Oliveira, Christie H. Noda, Atsushi Crundwell, Martin P. Shepherd, Claire L. Woodhouse, Adam D. Harris, Robert N. Wang, Maomao Henrys, Stuart Barker, Daniel H.N. Petronotis, Katerina E. Bourlange, Sylvain M. Clennell, Michael B. Cook, Ann E. Dugan, Brandon E. Elger, Judith Fulton, Patrick M. Gamboa, Davide Greve, Annika Han, Shuoshuo Hüpers, Andre Ikari, Matt J. Ito, Yoshihiro Kim, Gil Young Koge, Hiroaki Lee, Hikweon Li, Xuesen Luo, Min Malie, Pierre R. Moore, Gregory F. Mountjoy, Joshu J. McNamara, David D. Paganoni, Matteo Screaton, Elizabeth J. Shankar, Uma Shreedharan, Srisharan Solomon, Evan A. Wang, Xiujuan Wu, Hung-Yu Pecher, Ingo A. LeVay, Leah J. PY - 2020 SP - eaay3314 ST - Slow slip source characterized by lithological and geometric heterogeneity T2 - Science Advances TI - Slow slip source characterized by lithological and geometric heterogeneity UR - https://doi.org/10.1126/sciadv.aay3314 VL - 6 ID - 6760 ER - TY - JOUR AB - The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ13C and δ18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic reconstruction of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ∼4–5°C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of warming, we observe a long-term increase in δ18Osw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species from ∼57–54 Ma, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO2 concentrations during this time. AU - Barnet, James S. K. AU - Harper, Dustin T. AU - LeVay, Leah J. AU - Edgar, Kirsty M. AU - Henehan, Michael J. AU - Babila, Tali L. AU - Ullmann, Clemens V. AU - Leng, Melanie J. AU - Kroon, Dick AU - Zachos, James C. AU - Littler, Kate DA - 2020/09/01/ DO - https://doi.org/10.1016/j.epsl.2020.116414 KW - trace elements paleoclimate paleoceanography Paleogene Paleocene-Eocene Thermal Maximum Indian Ocean N1 - https://www.sciencedirect.com/science/article/pii/S0012821X20303587 PY - 2020 SN - 0012-821X SP - 116414 ST - Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene: new trace element records from the low latitude Indian Ocean T2 - Earth and Planetary Science Letters TI - Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene: new trace element records from the low latitude Indian Ocean UR - https://doi.org/10.1016/j.epsl.2020.116414 VL - 545 ID - 8674 ER - TY - JOUR AB - The Paleocene–Eocene transition was a time of short-term rapid climatic and biotic change, superimposed on a long-term warming trend. The response of shallow tropical carbonate systems to past rapid warming is important to understand in the context of ongoing and future anthropogenic global warming. Larger benthic foraminifera (LBF) were abundant and important components of shallow water ecosystems throughout the early Paleogene and are sensitive to environmental change, making them ideal organisms to track shallow marine biodiversity. Furthermore, through the use of integrated bio- and chemostratigraphy it is possible to correlate the shallow (<100 m) and deep water realms to create a regional stratigraphic framework for the time period. Here we present a new LBF biostratigraphic and high-resolution carbonate carbon isotopic record spanning the Paleocene–Eocene transition from the onshore sub-surface of the United Arab Emirates (UAE). Results show a turnover event in the LBF assemblage during the early Eocene, wherein there are a number of first and last occurrences of species. However, assemblages remain generally stable coincident with the large negative carbon isotope excursion interpreted to be the onset of the Paleocene–Eocene thermal maximum (PETM). Turnover in the LBF assemblage in the early Eocene likely occurred due to the crossing of a long-term climatic and oceanographic threshold. The impacts of this long-term climatic change on the overall biotic assemblage at this site are significant, with LBF outcompeting a previously diverse community of corals, gastropods, and bivalves to become the dominant carbonate producers through the Paleocene–Eocene­ transition. Despite this, modern studies suggest that LBF are not immune to impacts of anthropogenic climate change, perhaps due to the significantly higher rates of change in the modern compared to the Paleocene–Eocene transition. AU - Beasley, Charlotte AU - Cotton, Laura AU - Al-Suwaidi, Aisha AU - LeVay, Leah AU - Sluijs, Appy AU - Ullmann, Clemens V. AU - Hesselbo, Stephen P. AU - Littler, Kate IS - 1 PY - 2021 SP - 79–106 ST - Triumph and tribulation for shallow water fauna during the Paleocene–Eocene transition: insights from the United Arab Emirates T2 - Newsletters on Stratigraphy TI - Triumph and tribulation for shallow water fauna during the Paleocene–Eocene transition: insights from the United Arab Emirates UR - https://doi.org/10.1127/nos/2020/0573 VL - 54 ID - 10676 ER - TY - CPAPER AU - Behboudi, E., Lokmer, I., McNamara, D., Manzocchi, T., Wallace, L., Saffer, D., Barnes, P., Pecher, I., Lee, H., Kim, G.Y., Wu, H.-Y., Petronotis, K., LeVay, L., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Online DA - 4–8 May 2020 PY - 2020 T2 - 2020 European Geosciences Union General Assembly TI - Stress orientation variability along the Hikurangi subduction margin: insights from borehole image logging UR - https://doi.org/10.5194/egusphere-egu2020-20603 ID - 14386 ER - TY - JOUR AU - Berke, M.A., Cartagena-Sierra, A., Castaneda, I.S., Van Der Meer, M.T.J., Hall, I.R., Hemming, S.R., and LeVay, L.J. DO - https://doi.org/10.1130/abs/2018AM-323259 IS - 6 PY - 2018 SP - 184 ST - Plio-Pleistocene biomarker reconstructions at the Agulhas Plateau and implications for terrestrial African Climate T2 - Geological Society of America Abstracts with Programs TI - Plio-Pleistocene biomarker reconstructions at the Agulhas Plateau and implications for terrestrial African Climate UR - https://doi.org/10.1130/abs/2018AM-323259 VL - 50 ID - 16190 ER - TY - CPAPER AU - Berke, M.A., Taylor, A.K., Castaneda, I.S., Hall, I.R., Hemming, S.R., and LeVay, L. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - American Geophysical Union Fall Meeting TI - Biomarker records of late Pliocene aridity from southeastern Africa UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11C-1260.html ID - 49136 ER - TY - CHAP A2 - Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., and the Expedition 341 Scientists AB - Site U1418 was cored on the Surveyor Fan in the Gulf of Alaska during Integrated Ocean Drilling Program (IODP) Expedition 341. A 949 m sedimentary sequence consisting of muds and diamicts was recovered. The uppermost ∼266 m contained rare intermittent occurrences of calcareous nannofossils. This interval spans approximately the last 200 ky and potentially records environmental changes associated with glacial-interglacial cycles, making it useful for paleoceanographic reconstructions. In an effort to determine calcareous nannofossil productivity through this time interval, we studied the nannofossil assemblage and calcium carbonate (CaCO3) weight percentage of the sediments. The nannofossil assemblage was dominated by Gephyrocapsa species and Coccolithus pelagicus. Gephyrocapsa spp. were most abundant between ∼100 and 266 m core composite depth below seafloor (CCSF-A). Shallower than 100 m, C. pelagicus composed at least half of the assemblage. Reworked specimens of Eocene-Oligocene age were consistently observed. CaCO3 content averaged 2.77 wt% and did not display any notable trends across the study interval. AU - Braha, Inva AU - Hager-Hahn, Emily AU - LeVay, Leah J. CY - College Station, TX J2 - Affiliation (analytic): International Ocean Discovery Program, College Station, TX Affiliation (monographic): International Ocean Discovery Program, College Station, TX, United States Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 341 Scientists, College Station, TX Coordinates: N584635 N584637 W1442933 W1442936 illus., incl. 2 plates, 2 tables, sketch map Contains 12 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Proceedings of the Integrated Ocean Drilling Program; southern Alaska Margin; Expedition 341 of the riserless drilling platform, Victoria, British Columbia (Canada), to Valdez, Alaska (USA); Sites U1417-U1421, 29 May-29 July 2013, John M. Jaeger, Sean P. S. Gulick, Leah J. LeVay, Angela L. Slagle, Laureen Drab, Hirofumi Asahi, Heinrich Bahlburg, Christina L. Belanger, Glaucia Bueno Benedetti Berbel, Laurel B. Childress, Ellen A. Cowan, Matthias Forwick, Akemi Fukumura, Ge Shulan, Shyam M. Gupta, Arata Kioka, Susumu Konno, Christian E. März, Kenji M. Matsuzaki, Erin L. McClymont, Alan C. Mix, Christopher M. Moy, Juliane Müller, Atsunori Nakamura, Takanori Ojima, Kenneth D. Ridgway, Fabiana Rodrigues Ribeiro, Oscar E. Romero, Joseph S. Stoner, Guillaume St-Onge, Itsuki Suto, Maureen H. Walczak and Lindsay L. Worthington; Integrated Ocean Drilling Program, Expedition 341 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.341, 10p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2020003962 DOI: 10.2204/iodp.proc.341.205.2019 KW - Algae Assemblages Biostratigraphy Calcium carbonate Cenozoic Coccolithophoraceae Cores East Pacific Expedition 341 Gulf of Alaska Holocene IODP Site U1418 Integrated Ocean Drilling Program Marine sediments Microfossils Nannofossils North Pacific Northeast Pacific Pacific Ocean Paleoecology Pleistocene Productivity Quaternary Sediments Shells Upper Pleistocene 24 Surficial Geology, Quaternary Geology LA - English PB - Integrated Ocean Drilling Program PY - 2019 SN - 1930-1014 ST - Data report: calcareous nannofossils and bulk calcium carbonate measurements from IODP Expedition 341, Site U1418, Gulf of Alaska T2 - Proceedings of the Integrated Ocean Drilling Program TI - Data report: calcareous nannofossils and bulk calcium carbonate measurements from IODP Expedition 341, Site U1418, Gulf of Alaska UR - https://doi.org/10.2204/iodp.proc.341.205.2019 VL - 341 ID - 4775 ER - TY - JOUR AU - Bralower, T.J., Schneider, L.J., Gibbs, S., Raffi, I., and Sessa, J.A. IS - 52 PY - 2009 SP - PP44A-04 ST - Quantitative ecological analysis of the nannoplankton response to the Paleocene Eocene Thermal Maximum T2 - Eos, Transactions of the American Geophysical Union TI - Quantitative ecological analysis of the nannoplankton response to the Paleocene Eocene Thermal Maximum UR - https://abstractsearch.agu.org/meetings/2009/FM/PP44A-04.html VL - 90 ID - 49130 ER - TY - CPAPER AU - Cares, Z., Farr, C.L., LeVay, L., Tangunan, D., and Brentegani, L. CY - New Orleans, LA DA - 11–15 December 2017 PY - 2017 T2 - 2017 American Geophysical Union Fall Meeting TI - Calcareous nannoplankton assemblages across the Pliocene-Pleistocene transition in the southwestern Indian Ocean, IODP Site U1475 UR - https://abstractsearch.agu.org/meetings/2017/FM/PP23A-1285.html ID - 16187 ER - TY - JOUR AB - Abstract The meridional variability of the Subtropical Front (STF) in the Southern Hemisphere, linked to expansions or contractions of the Southern Ocean, may have played an important role in global ocean circulation by moderating the magnitude of water exchange at the Indian-Atlantic Ocean Gateway, so called Agulhas Leakage. Here we present new biomarker records of upper water column temperature ( and ) and primary productivity (chlorins and alkenones) from marine sediments at IODP Site U1475 on the Agulhas Plateau, near the STF and within the Agulhas retroflection pathway. We use these multiproxy time-series records from 1.4 to 0.3 Ma to examine implied changes in the upper oceanographic conditions at the mid-Pleistocene transition (MPT, ca. 1.2–0.8 Ma). Our reconstructions, combined with prior evidence of migrations of the STF over the last 350 ka, suggest that in the Southwestern Indian Ocean the STF may have been further south from the Agulhas Plateau during the mid-Pleistocene Interim State (MPIS, MIS 23–12) and reached its northernmost position during MIS 34–24 and MIS 10. Comparison to a Globorotalia menardii-derived Agulhas Leakage reconstruction from the Cape Basin suggests that only the most extreme northward migrations of the STF are associated with reduced Agulhas Leakage. During the MPIS, STF migrations do not appear to control Agulhas Leakage variability, we suggest previously modeled shifting westerly winds may be responsible for the patterns observed. A detachment between STF migrations and Agulhas Leakage, in addition to invoking shifting westerly winds may also help explain changes in CO2 ventilation seen during the MPIS. AU - Cartagena-Sierra, Alejandra AU - Berke, Melissa A. AU - Robinson, Rebecca S. AU - Marcks, Basia AU - Castañeda, Isla S. AU - Starr, Aidan AU - Hall, Ian R. AU - Hemming, Sidney R. AU - LeVay, Leah J. AU - the Expedition 361 Scientific Party DO - https://doi.org/10.1029/2020PA004084 IS - 7 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020PA004084 PY - 2021 SN - 2572-4517 SP - e2020PA004084 ST - Latitudinal migrations of the subtropical front at the Agulhas Plateau through the Mid-Pleistocene Transition T2 - Paleoceanography and Paleoclimatology TI - Latitudinal migrations of the subtropical front at the Agulhas Plateau through the Mid-Pleistocene Transition UR - https://doi.org/10.1029/2020PA004084 VL - 36 ID - 16980 ER - TY - JOUR AU - Clemens, S.C., Kuhnt, W., and LeVay, L.J. PY - 2014 ST - Expedition 353 Scientific Prospectus: iMonsoon T2 - International Ocean Discovery Program TI - Expedition 353 Scientific Prospectus: iMonsoon UR - https://doi.org/10.14379/iodp.sp.353.2014 ID - 14001 ER - TY - JOUR AB - International Ocean Discovery Program (IODP) Expedition 353 (29 November 2014-29 January 2015) drilled six sites in the Bay of Bengal, recovering 4280 m of sediments during 32.9 days of on-site drilling. Recovery averaged 97%, including coring with the advanced piston corer, half-length advanced piston corer, and extended core barrel systems. The primary objective of Expedition 353 is to reconstruct changes in Indian monsoon circulation since the Miocene at tectonic to centennial timescales. Analysis of the sediment sections recovered will improve our understanding of how monsoonal climates respond to chan ges in forcing external to the Earth's climate system (i.e., insolation) and changes in forcing internal to the Earth's climate system, including changes in continental ice volume, greenhouse gases, sea level, and the ocean-atmosphere exchange of energy and moisture. All of these mechanisms play critical roles in current and future climate change in monsoonal regions. The primary signal targeted is the exceptionally low salinity surface waters that result, in roughly equal measure, from both direct summer monsoon precipitation to the Bay of Bengal and runoff from the numerous large river basins that drain into the Bay of Bengal. Changes in rainfall and surface ocean salinity are captured and preserved in a number of chemical, physical, isotopic, and biological components of sediments deposited in the Bay of Bengal. Expedition 353 sites are strategically located in key regions where these signals are the strongest and best preserved. Salinity changes at IODP Sites U1445 and U1446 (northeast Indian margin) result from direct precipitation as well as runoff from the Ganges-Brahmaputra river complex and the many river basins of peninsular India. Salinity changes at IODP Sites U1447 and U1448 (Andaman Sea) result from direct precipitation and runoff from the Irrawaddy and Salween river basins. IODP Site U1443 (Ninetyeast Ridge) is an open-ocean site with a modern surface water salinity very near the global mean but is documented to have recorded changes in monsoonal circulation over orbital to tectonic timescales. This site serves as an anchor for establishing the extent to which the north to south (19°N to 5°N) salinity gradient changes over time. AU - Clemens, S.C., Kuhnt, W., LeVay, L.J., and the Expedition 353 Scientists J2 - Affiliation (analytic): Brown University, Department of Geological Sciences, Providence, RI Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 353 Scientists, College Station, TX Coordinates: N052300 N190500 E0930000 E0844700 Contains 151 references Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Reports (International Ocean Discovery Program), Vol.353, 46p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2015044801 URL access: Open access DOI: 10.14379/iodp.pr.353.2015 KW - Algae Atmospheric circulation Bay of Bengal Biostratigraphy Boreholes Cenozoic Chemostratigraphy Cores Correlation Cretaceous Diatoms Drilling Expedition 353 Foraminifera IODP Site U1443 IODP Site U1444 IODP Site U1445 IODP Site U1446 IODP Site U1447 IODP Site U1448 Indian Ocean International Ocean Discovery Program Invertebrata Lithostratigraphy Magnetostratigraphy Marine drilling Marine sediments Mesozoic Microfossils Nannofossils Ocean circulation Physical properties Planning Plantae Pleistocene Protista Quaternary Sediments Tertiary Upper Cretaceous Water masses 12 Stratigraphy, Historical Geology and Paleoecology LA - English PY - 2015 SN - 2372-9562 ; ST - Expedition 353 Preliminary Report: Indian Monsoon Rainfall T2 - International Ocean Discovery Program TI - Expedition 353 Preliminary Report: Indian Monsoon Rainfall UR - https://doi.org/10.14379/iodp.pr.353.2015 ID - 5170 ER - TY - CPAPER AU - Clemens, S.C., Kuhnt, W., LeVay, L.J., and the Expedition 353 Scientific Party CY - Goa, India DA - 3–5 November 2015 PY - 2015 T2 - 2015 Indian Geophysical Union (IGU) Annual Convention TI - Dynamics of the Indian Ocean: perspective and retrospective ID - 15962 ER - TY - BOOK AU - Clemens, S.C., Kuhnt, W., LeVay, L.J., and the Expedition 353 Scientists CY - College Station, TX J2 - Affiliation (analytic): Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, RI Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 353 Scientists, College Station, TX Coordinates: N052300 N190500 E0930000 E0844700 Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.353. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2016076797 DOI: 10.14379/iodp.proc.353.2016 KW - Algae Bay of Bengal Biostratigraphy Boreholes Cenozoic Chemostratigraphy Cores Diatoms Downhole methods Expedition 353 Foraminifera Geochemistry Hydrochemistry IODP Site U1443 IODP Site U1444 IODP Site U1445 IODP Site U1446 IODP Site U1447 IODP Site U1448 Indian Ocean International Ocean Discovery Program Invertebrata Lithostratigraphy Magnetic properties Magnetic susceptibility Magnetostratigraphy Marine sediments Microfossils Nannofossils Paleomagnetism Physical properties Plantae Pore water Protista Quaternary Sediments Tertiary Well logs 12 Stratigraphy, Historical Geology and Paleoecology LA - English PB - International Ocean Discovery Program PY - 2016 SN - 2377-3189 ; ST - Indian Monsoon Rainfall. Proceedings of the International Ocean Discovery Program TI - Indian Monsoon Rainfall. Proceedings of the International Ocean Discovery Program UR - https://doi.org/10.14379/iodp.proc.353.2016 VL - 353 ID - 5173 ER - TY - JOUR AB - Abstract The Pāpaku Fault Zone, drilled at International Ocean Discovery Program (IODP) Site U1518, is an active splay fault in the frontal accretionary wedge of the Hikurangi Margin. In logging-while-drilling data, the 33-m-thick fault zone exhibits mixed modes of deformation associated with a trend of downward decreasing density, P-wave velocity, and resistivity. Methane hydrate is observed from ~30 to 585 m below seafloor (mbsf), including within and surrounding the fault zone. Hydrate accumulations are vertically discontinuous and occur throughout the entire logged section at low to moderate saturation in silty and sandy centimeter-thick layers. We argue that the hydrate distribution implies that the methane is not sourced from fluid flow along the fault but instead by local diffusion. This, combined with geophysical observations and geochemical measurements from Site U1518, suggests that the fault is not a focused migration pathway for deeply sourced fluids and that the near-seafloor Pāpaku Fault Zone has little to no active fluid flow. AU - Cook, Ann E. AU - Paganoni, Matteo AU - Clennell, Michael Benedict AU - McNamara, David D. AU - Nole, Michael AU - Wang, Xiujuan AU - Han, Shuoshuo AU - Bell, Rebecca E. AU - Solomon, Evan A. AU - Saffer, Demian M. AU - Barnes, Philip M. AU - Pecher, Ingo A. AU - Wallace, Laura M. AU - LeVay, Leah J. AU - Petronotis, Katerina E. DO - https://doi.org/10.1029/2020GL088474 IS - 16 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL088474 PY - 2020 SN - 0094-8276 SP - e2020GL088474 ST - Physical properties and gas hydrate at a near-seafloor thrust fault, Hikurangi Margin, New Zealand T2 - Geophysical Research Letters TI - Physical properties and gas hydrate at a near-seafloor thrust fault, Hikurangi Margin, New Zealand UR - https://doi.org/10.1029/2020GL088474 VL - 47 ID - 7161 ER - TY - CPAPER AU - Dugan, B., Pecher, I.A., Nole, M., Mountjoy, J.J., Barnes, P.M., LeVay, L., IODP Expedition 372 Scientists, and IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Formation pore pressure through the Tuaheni landslide complex and the gas hydrate stability zone at IODP Expedition 372 Site U1517, Hikurangi Margin, New Zealand UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0313.html ID - 14710 ER - TY - CONF AU - Dugan, Brandon AU - Pecher, Ingo Andreas AU - Nole, Michael AU - Mountjoy, Joshu J AU - Barnes, Philip M AU - LeVay, Leah PY - 2018 SP - T51I-0313 ST - Formation pore pressure through the Tuaheni Landslide Complex and the gas hydrate stability zone at IODP Expedition 372 Site U1517, Hikurangi Margin, New Zealand T2 - AGU Fall Meeting 2018 TI - Formation pore pressure through the Tuaheni Landslide Complex and the gas hydrate stability zone at IODP Expedition 372 Site U1517, Hikurangi Margin, New Zealand UR - https://agu.confex.com/agu/fm18/meetingapp.cgi/Paper/391775 VL - 2018 ID - 12539 ER - TY - BOOK AB - International Ocean Discovery Program (IODP) Expedition 388 seeks to answer first-order questions about the tectonic, climatic, and biotic evolution of the Equatorial Atlantic Gateway (EAG). The scheduled drilling operations will target sequences of Late Cretaceous and Cenozoic sediments offshore northeast Brazil, just south of the theorized final opening point of the EAG. These sequences are accessible to conventional riserless drilling in the vicinity of the Pernambuco Plateau, part of the northeastern Brazilian continental shelf. This region was chosen to satisfy two key constraints: first, that some of the oldest oceanic crust of the equatorial Atlantic and overlying early postrift sediments are present at depths shallow enough to be recovered by riserless drilling, and second, Late Cretaceous and Paleogene sediments preserved on the Pernambuco Plateau are close enough to the continental margin and at shallow enough paleowater depths (<2000 m) to provide well-preserved organic biomarkers and calcareous microfossils for multiproxy studies of greenhouse climate states. New records in this region will allow us to address major questions in four key objectives: the early rift history of the equatorial Atlantic, the biogeochemistry of the restricted equatorial Atlantic, the long-term paleoceanography of the EAG, and the limits of tropical climates and ecosystems under conditions of extreme warmth. Tackling these major questions with new drilling in the EAG region will advance our understanding of the long-term interactions between tectonics, oceanography, ocean biogeochemistry, and climate and the functioning of tropical ecosystems and climate during intervals of extreme warmth. AU - Dunkley Jones, Tom AU - Fauth, Gerson AU - LeVay, Leah J. CY - International Ocean Discovery Program J2 - Affiliation (analytic): University of Birmingham, School of Geography, Earth and Environmental Science, Birmingham Coordinates: S100000 S073000 W0330000 W0350000 Contains 75 references Research Program: IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Scientific Prospectus (International Ocean Discovery Program), Vol.388, 31p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2332-1385 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2020030408 URL access: Open access DOI: 10.14379/iodp.sp.388.2019 KW - Atlantic Ocean Boreholes Brazil Cenozoic Climate change Cretaceous Downhole methods Equatorial Atlantic Expedition 388 Expeditions Geodynamics Gondwana Gravity anomalies International Ocean Discovery Program Lithostratigraphy Lower Cretaceous Marine sediments Mesozoic Northeastern Brazil Ocean circulation Paleo-oceanography Paleoclimatology Paleoenvironment Paleotemperature Pernambuco Plateau Planning Plate tectonics Quaternary Rifting Sediments South America Tertiary Well-logging 12 Stratigraphy, Historical Geology and Paleoecology 18 Geophysics, Solid-Earth LA - English PY - 2019 SN - 2332-1385 ; SP - 31 ST - Expedition 388 Scientific Prospectus: Equatorial Atlantic Gateway TI - Expedition 388 Scientific Prospectus: Equatorial Atlantic Gateway UR - https://doi.org/10.14379/iodp.sp.388.2019 ID - 5527 ER - TY - CPAPER AU - Edgar, K., Hanson, E., MacLeod, K., Batenburg, S., Bogus, K., LeVay, L., De Vleeschouwer, D., Hasegawa, T., Huber, B.T., Petrizzo, M.R., Xu, X., and Hobbs, R.W. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - The impact of Tasman Gateway opening on early Paleogene climate and oceans: new results from IODP Expedition 369, Site U1514 UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11D-1275.html ID - 15164 ER - TY - CPAPER AU - Fagereng, A., Savage, H.M., Morgan, J., Wang, M., Meneghini, F., Barnes, P., Bell, R.E., Kitajima, H., McNamara, D.D., Saffer, D.M., Wallace, L.M., Pecher, I.A., Petronotis, K.E., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Brittle-ductile deformation and fault slip behavior of a shallow subduction thrust, Hikurangi margin, New Zealand UR - https://abstractsearch.agu.org/meetings/2018/FM/T54C-06.html ID - 14712 ER - TY - JOUR AB - Geophysical observations show spatial and temporal variations in fault slip style on shallow subduction thrust faults, but geological signatures and underlying deformation processes remain poorly understood. International Ocean Discovery Program (IODP) Expeditions 372 and 375 investigated New Zealand's Hikurangi margin in a region that has experienced both tsunami earthquakes and repeated slow-slip events. We report direct observations from cores that sampled the active Papaku splay fault at 304 m below the seafloor. This fault roots into the plate interface and comprises an 18-m-thick main fault underlain by ∼30 m of less intensely deformed footwall and an ∼10-m-thick subsidiary fault above undeformed footwall. Fault zone structures include breccias, folds, and asymmetric clasts within transposed and/or dismembered, relatively homogeneous, silty hemipelagic sediments. The data demonstrate that the fault has experienced both ductile and brittle deformation. This structural variation indicates that a range of local slip speeds can occur along shallow faults, and they are controlled by temporal, potentially far-field, changes in strain rate or effective stress. AU - Fagereng, A. AU - Savage, H. M. AU - Morgan, J. K. AU - Wang, M. AU - Meneghini, F. AU - Barnes, P. M. AU - Bell, R. AU - Kitajima, H. AU - McNamara, D. D. AU - Saffer, D. M. AU - Wallace, L. M. AU - Petronotis, Katerina AU - LeVay, L. IS - 9 J2 - Affiliation (analytic): Cardiff University, School of Earth and Ocean Sciences, Cardiff Affiliation (monographic): Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 372 Scientists, College Station, TX Coordinates: S385133 S385133 E1785346 E1785346 illus., incl. sects., geol. sketch map Contains 36 references Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Geology (Boulder), 47(9), p.872-876. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States, Reference includes data supplied by the Geological Society of America GeoRef ID: 2019065641 DOI: 10.1130/G46367.1 KW - Australasia Brittle deformation Crust Deformation Ductile deformation Expedition 372 Expedition 375 Faults Geophysical methods Geophysical profiles Geophysical surveys Hikurangi Margin IODP Site U1518 International Ocean Discovery Program New Zealand North Island Oceanic crust Pacific Ocean Plate convergence Pore pressure Seismic methods Seismic profiles South Pacific Southwest Pacific Subduction zones Surveys Tectonics Thrust faults West Pacific 16 Structural Geology 20 Geophysics, Applied LA - English PY - 2019 SN - 0091-7613 SP - 872–876 ST - Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand T2 - Geology TI - Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand UR - https://doi.org/10.1130/G46367.1 VL - 47 ID - 5468 ER - TY - CPAPER AU - Gruetzner, J., Just, J., Koutsodendris, A., Tangunan, D., Hall, I.R., Hemming, S.R., LeVay, L.J., and Expedition 361 Scientists CY - Braunschweig, Germany DA - 14–16 March 2017 PY - 2017 T2 - 2017 ICDP/IODP Kolloquium TI - IODP Expedition 361—Southern African Climates and Agulhas LGM Density Profile UR - http://epic.awi.de/44304/ ID - 16192 ER - TY - CPAPER AU - Gruetzner, J., Uenzelmann-Neben, G., Jimenez-Espejo, F.J.J., Hall, I.R., LeVay, L., Lathika, N., and the IODP Expedition 361 Scientists, CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - American Geophysical Union Fall Meeting TI - High-resolution records of major element ratios for the Plio-Pleistocene at the Agulhas Plateau: implications for orbital variations in sediment provenance, the formation of seismic reflectors and deep water flow changes UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11C-1264.html ID - 49137 ER - TY - JOUR AB - Abstract The exchange of water masses between the Indian Ocean and the Atlantic constitutes an integral interocean link in the global thermohaline circulation. Long-term changes in deep water flow have been studied using seismic reflection profiles but the seismic stratigraphy was poorly constrained and not resolved for the time period from the late Miocene onward. Here we present results from International Ocean Discovery Program Site U1475 (Agulhas Plateau) located over a sediment drift proximal to the entrance of North Atlantic Deep Water into the Southern Ocean and South Indian Ocean. Site U1475 comprises a complete carbonate-rich stratigraphic section of the last ~7 Ma that provides an archive of climate-induced variations in ocean circulation. Six marker reflectors occurring in the upper 300 m of the drift are identified here for the first time. The formation of these reflectors is mainly due to density changes that are mostly caused by changes in biogenic versus terrigenous sediment deposition. Synthetic seismograms allow age assignments for the horizons based on biostratigraphy and magnetostratigraphy. Prominent reflectors are related to late Pleistocene glacial/interglacial variability, the middle and early Pleistocene transitions, and the onset of the northern hemisphere glaciation. A peculiar early Pliocene interval (~5.3–4.0 Ma) bounded by two reflectors is characterized by fourfold elevated sedimentation rates (>10 cm/kyr) and the occurrence of sediment waves. We argue that this enhanced sediment transport to the Agulhas Plateau was caused by a reorganization of the bottom current circulation pattern due to maximized inflow of North Atlantic Deep Water. AU - Gruetzner, Jens AU - Jiménez Espejo, Francisco J. AU - Lathika, Nambiyathodi AU - Uenzelmann-Neben, Gabriele AU - Hall, Ian R. AU - Hemming, Sidney R. AU - LeVay, Leah J. AU - the Expedition 361 Scientists DO - https://doi.org/10.1029/2018GC007668 IS - 1 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GC007668 PY - 2019 SN - 1525-2027 SP - 339–358 ST - A new seismic stratigraphy in the Indian-Atlantic Ocean gateway resembles major paleo-oceanographic changes of the last 7 Ma T2 - Geochemistry, Geophysics, Geosystems TI - A new seismic stratigraphy in the Indian-Atlantic Ocean gateway resembles major paleo-oceanographic changes of the last 7 Ma UR - https://doi.org/10.1029/2018GC007668 VL - 20 ID - 7654 ER - TY - JOUR AB - Erosion, sediment production, and routing on a tectonically active continental margin reflect both tectonic and climatic processes; partitioning the relative importance of these processes remains controversial. Gulf of Alaska contains a preserved sedimentary record of the Yakutat Terrane collision with North America. Because tectonic convergence in the coastal St. Elias orogen has been roughly constant for 6 My, variations in its eroded sediments preserved in the offshore Surveyor Fan constrain a budget of tectonic material influx, erosion, and sediment output. Seismically imaged sediment volumes calibrated with chronologies derived from Integrated Ocean Drilling Program boreholes show that erosion accelerated in response to Northern Hemisphere glacial intensification (≈2.7 Ma) and that the 900-km-long Surveyor Channel inception appears to correlate with this event. However, tectonic influx exceeded integrated sediment efflux over the interval 2.8-1.2 Ma. Volumetric erosion accelerated following the onset of quasi-periodic (≈100-ky) glacial cycles in the mid-Pleistocene climate transition (1.2-0.7 Ma). Since then, erosion and transport of material out of the orogen has outpaced tectonic influx by 50-80%. Such a rapid net mass loss explains apparent increases in exhumation rates inferred onshore from exposure dates and mapped out-of-sequence fault patterns. The 1.2-My mass budget imbalance must relax back toward equilibrium in balance with tectonic influx over the timescale of orogenic wedge response (millions of years). The St. Elias Range provides a key example of how active orogenic systems respond to transient mass fluxes, and of the possible influence of climate-driven erosive processes that diverge from equilibrium on the million-year scale. AU - Gulick, Sean P. S. AU - Jaeger, John M. AU - Mix, Alan C. AU - Asahi, Hirofumi AU - Bahlburg, Heinrich AU - Belanger, Christina L. AU - Berbel, Glaucia B. B. AU - Childress, Laurel AU - Cowan, Ellen AU - Drab, Laureen AU - Forwick, Matthias AU - Fukumura, Akemi AU - Shulan, Ge AU - Gupta, Shyam AU - Kioka, Arata AU - Konno, Susumu AU - LeVay, Leah J. AU - März, Christian AU - Matsuzaki, Kenji M. AU - McClymont, Erin L. AU - Moy, Chris AU - Müller, Juliane AU - Nakamura, Atsunori AU - Ojima, Takanori AU - Ribeiro, Fabiana R. AU - Ridgway, Kenneth D. AU - Romero, Oscar E. AU - Slagle, Angela L. AU - Stoner, Joseph S. AU - St-Onge, Guillaume AU - Suto, Itsuki AU - Walczak, Maureen D. AU - Worthington, Lindsay L. AU - Bailey, Ian AU - Enkelmann, Eva AU - Reece, Robert AU - Swartz, John M. IS - 49 J2 - Affiliation (analytic): University of Texas at Austin, Institute for Geophysics, Austin, TX Affiliation (monographic): University of Texas at Austin, Institute for Geophysics, Austin, TX, United States Coordinates: N565000 N600000 W1420000 W1480000 illus., incl. geol. sketch maps Contains 48 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Proceedings of the National Academy of Sciences of the United States of America, 112(49), p.15042-15047. Publisher: National Academy of Sciences, Washington, DC, United States. ISSN: 0027-8424 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2020061123 DOI: 10.1073/pnas.1512549112 KW - Alaska Aleutian Trench Blying Sound Quadrangle Cenozoic Continental shelf Continental slope East Pacific Erosion rates Expedition 341 Geotraverses Gulf of Alaska IODP Site U1417 IODP Site U1418 IODP Site U1419 IODP Site U1420 IODP Site U1421 Icy Bay Quadrangle Integrated Ocean Drilling Program Middle Pleistocene Middleton Island Quadrangle Neogene North America North Pacific Northeast Pacific Pacific Ocean Pleistocene Pliocene Quaternary Saint Elias Mountains Saint Elias Orogen Sedimentation Sedimentation rates Surveyor Channel Surveyor Fan Tertiary United States Uplifts 24 Surficial Geology, Quaternary Geology LA - English PY - 2015 SN - 0027-8424 SP - 15042–15047 ST - Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska T2 - Proceedings of the National Academy of Sciences of the United States of America TI - Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska UR - https://doi.org/10.1073/pnas.1512549112 VL - 112 ID - 4787 ER - TY - BOOK AB - The Agulhas Current is the strongest western boundary current in the Southern Hemisphere, transporting some 70 Sv of warm and saline surface waters from the tropical Indian Ocean along the East African margin to the tip of Africa. Exchanges of heat and moisture with the atmosphere influence southern African climates, including individual weather systems such as extratropical cyclone formation in the region and rainfall patterns. Recent ocean models and paleo-oceanographic data further point at a potential role of the Agulhas Current in controlling the strength and mode of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Pleistocene. Spillage of saline Agulhas water into the South Atlantic stimulates buoyancy anomalies that act as a control mechanism on the basin-wide AMOC, with implications for convective activity in the North Atlantic and Northern Hemisphere climate. International Ocean Discovery Program (IODP) Expedition 361 aims to extend this work to periods of major ocean and climate restructuring during the Pliocene/Pleistocene to assess the role that the Agulhas Current and ensuing (interocean) marine heat and salt transports have played in shaping the regional- and global-scale ocean and climate development. This expedition will core six sites on the southeast African margin and Indian-Atlantic ocean gateway. The primary sites are located between 416 and 3040 m water depths. The specific scientific objectives are • To assess the sensitivity of the Agulhas Current to changing climates of the Pliocene/Pleistocene, in association with transient to long-term changes of high-latitude climates, tropical heat budgets, and the monsoon system; • To reconstruct the dynamics of the Indian-Atlantic gateway circulation during such climate changes, in association with changing wind fields and migrating ocean fronts; • To examine the connection between Agulhas leakage and ensuing buoyancy transfer and shifts of the AMOC during major ocean and climate reorganizations during at least the last 5 My; and • To address the impact of Agulhas variability on southern Africa terrestrial climates and, notably, rainfall patterns and river runoff. Additionally, Expedition 361 will complete an intensive interstitial fluids program at four of the sites aimed at constraining the temperature, salinity, and density structure of the Last Glacial Maximum (LGM) deep ocean, from the bottom of the ocean to the base of the main thermocline, to address the processes that could fill the LGM ocean and control its circulation. Expedition 361 will seek to recover ∼5200 m of sediment in total. The coring strategy will include the triple advanced piston corer system along with the extended core barrel coring system where required to reach target depths. Given the significant transit time required during the expedition (15.5 days), the coring schedule is tight and will require detailed operational planning and flexibility from the scientific party. The final operations plan, including the number of sites to be cored and/or logged, is contingent upon the R/V JOIDES Resolution operations schedule, operational risks, and the outcome of requests for territorial permission to occupy particular sites. All relevant IODP sampling and data policies will be adhered to during the expedition. Beyond the interstitial fluids program, shipboard sampling will be restricted to acquiring ephemeral data and to limited low-resolution sampling of parameters that may be critically affected by short-term core storage. Most sampling will be deferred to a postcruise sampling party that will take place at the Gulf Coast Repository in College Station, Texas (USA). A substantial onshore X-ray fluorescence scanning plan is anticipated and will be further developed in consultation with scientific participants. AU - Hall, Ian AU - Hemming, Sidney AU - LeVay, Leah CY - International Ocean Discovery Program J2 - Affiliation (analytic): Cardiff University, School of Earth and Ocean Sciences, Cardiff Coordinates: S412700 S190800 E0370100 E0171200 Contains 48 references Research Program: IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Scientific Prospectus (International Ocean Discovery Program), Vol.361, 51p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2332-1385 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2015094115 URL access: Open access DOI: 10.14379/iodp.sp.361.2015 KW - Africa Agulhas Current Atlantic Ocean Cenozoic Climate change Drilling Expedition 361 Geophysical methods Geophysical profiles Geophysical surveys Indian Ocean International Ocean Discovery Program Last glacial maximum Marine drilling Marine sediments Neogene Ocean circulation Paleo-oceanography Paleoclimatology Planning Pleistocene Pliocene Quaternary Sediments Seismic methods Seismic profiles Seismic stratigraphy South Atlantic Southeast Atlantic Southern Africa Surveys Tertiary 12 Stratigraphy, Historical Geology and Paleoecology 20 Geophysics, Applied LA - English PY - 2015 SN - 2332-1385 ; ST - Expedition 361 Scientific Prospectus: South African Climates (Agulhas LGM Density Profile) TI - Expedition 361 Scientific Prospectus: South African Climates (Agulhas LGM Density Profile) UR - https://doi.org/10.14379/iodp.sp.361.2015 ID - 5315 ER - TY - BOOK AB - International Ocean Discovery Program (IODP) Expedition 361 drilled six sites on the southeast African margin and in the Indian-Atlantic ocean gateway, southwest Indian Ocean, from 30 January to 31 March 2016. In total, 5175 m of core was recovered, with an average recovery of 102%, during 29.7 days of on-site operations. The sites, situated in the Mozambique Channel at locations directly influenced by discharge from the Zambezi and Limpopo River catchments, the Natal Valley, the Agulhas Plateau, and Cape Basin, were targeted to reconstruct the history of the greater Agulhas Current system over the past ∼5 my. The Agulhas Current is the strongest western boundary current in the Southern Hemisphere, transporting some 70 Sv of warm, saline surface water from the tropical Indian Ocean along the East African margin to the tip of Africa. Exchanges of heat and moisture with the atmosphere influence southern African climates, including individual weather systems such as extratropical cyclone formation in the region and rainfall patterns. Recent ocean model and paleoceanographic data further point at a potential role of the Agulhas Current in controlling the strength and mode of the Atlantic Meridional Overturning Circulation (AMOC) during the Late Pleistocene. Spillage of saline Agulhas water into the South Atlantic stimulates buoyancy anomalies that act as control mechanisms on the basin-wide AMOC, with implications for convective activity in the North Atlantic and global climate change. The main objectives of the expedition were to establish the sensitivity of the Agulhas Current to climatic changes during the Pliocene-Pleistocene, to determine the dynamics of the Indian-Atlantic gateway circulation during this time, to examine the connection of the Agulhas leakage and AMOC, and to address the influence of the Agulhas Current on African terrestrial climates and coincidences with human evolution. Additionally, the expedition set out to fulfill the needs of the Ancillary Project Letter, consisting of high-resolution interstitial water samples that will constrain the temperature and salinity profiles of the ocean during the Last Glacial Maximum. The expedition made major strides toward fulfilling each of these objectives. The recovered sequences allowed generation of complete spliced stratigraphic sections that span from 0 to between ∼0.13 and 7 Ma. This sediment will provide decadal- to millennial-scale climatic records that will allow answering the paleoceanographic and paleoclimatic questions set out in the drilling proposal. AU - Hall, I.R., Hemming, S.R., LeVay, L.J., and the Expedition 361 Scientists CY - International Ocean Discovery Program J2 - Affiliation (analytic): Cardiff University, Department of Earth Sciences, Cardiff Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 361 Scientists, College Station, TX Coordinates: S311300 S311300 E0313243 E0313243; S412537 S412537 E0251538 E0251538; S154915 S154915 E0414607 E0414607; S192117 S192117 E0365454 E0365454; S254916 S254916 E0344610 E0344610; S350332 S350332 E0172404 E0172404 Contains 177 references Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Report - International Ocean Discovery Program, Vol.361, 46p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2016051681 URL access: Open access DOI: 10.14379/iodp.pr.361.2016 KW - Africa Agulhas Current Algae Atlantic Meridional Overturning Circulation Atlantic Ocean Biostratigraphy Cenozoic Chemostratigraphy Climate effects Continental margin Cores Currents Expedition 361 Foraminifera IODP Site U1474 IODP Site U1475 IODP Site U1476 IODP Site U1477 IODP Site U1478 IODP Site U1479 Indian Ocean International Ocean Discovery Program Invertebrata Last glacial maximum Lithostratigraphy Magnetostratigraphy Marine sediments Microfossils Mozambique Channel Nannofossils Neogene Ocean circulation Ocean currents Paleo-oceanography Paleoclimatology Paleomagnetism Physical properties Plantae Pleistocene Pliocene Protista Quaternary Sediments South Atlantic Southeast Atlantic Southern Africa Tertiary 12 Stratigraphy, Historical Geology and Paleoecology LA - English PY - 2016 SN - 2372-9562 ; ST - Expedition 361 Preliminary Report: South African Climates (Agulhas LGM Density Profile) TI - Expedition 361 Preliminary Report: South African Climates (Agulhas LGM Density Profile) UR - https://doi.org/10.14379/iodp.pr.361.2016 ID - 5314 ER - TY - BOOK AU - Hall, I.R., Hemming, S.R., LeVay, L.J., and the Expedition 361 Scientists CY - College Station, TX DO - https://doi.org/10.14379/iodp.proc.361.2017 J2 - Affiliation (analytic): Cardiff University, School of Earth and Ocean Sciences, Cardiff Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 361 Scientists, College Station, TX Coordinates: S412545 S154900 E0414610 E0172400 Research Program: IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.361. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2017087779 KW - Agulhas Current Algae Atlantic Ocean Biostratigraphy Cenozoic Cores Correlation Diatoms Expedition 361 Foraminifera Geochemistry Hydrochemistry Indian Ocean International Ocean Discovery Program Invertebrata Lithostratigraphy Magnetostratigraphy Marine sediments Microfossils Mozambique Channel Nannofossils Neogene Paleo-oceanography Paleoclimatology Physical properties Plantae Pore water Protista Quaternary Sediments South Atlantic Southeast Atlantic Tertiary West Indian Ocean 12 Stratigraphy, Historical Geology and Paleoecology LA - English PB - International Ocean Discovery Program PY - 2017 SN - 2377-3189 ; ST - South African Climates (Agulhas LGM Density Profile). Proceedings of the International Ocean Discovery Program TI - South African Climates (Agulhas LGM Density Profile). Proceedings of the International Ocean Discovery Program UR - https://doi.org/10.14379/iodp.proc.361.2017 VL - 361 ID - 5318 ER - TY - CPAPER AU - Hall, I.R., Lubbe, J.V.D., Baars, T.F., Barker, S., Hemming, S.R., LeVay, L.J., and the IODP Expedition 361 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - A five-million-year long eolian dust record from the Mozambique Channel - IODP Site U1476 UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11C-1265.html ID - 16188 ER - TY - CPAPER AU - Hall, I.R., Starr, A., Barker, S., Hemming, S.R., LeVay, L., Jimenez, F.J., Gruetzner, J., Lathika, N., and the Expedition 361 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - American Geophysical Union Fall Meeting TI - Deep water variability on the Southern Agulhas Plateau over the past 1.5 Ma UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11C-1262.html ID - 49138 ER - TY - CPAPER AU - Heeschen, K. AU - Schloemer, S. AU - Torres, M. AU - Cook, A. E. AU - Screaton, E. AU - Georgiopoulou, A. AU - Pecher, I. AU - Mayanna, S. AU - Barnes, P. AU - Solomon, E. AU - LeVay, L. CY - Online DA - 4–8 May 2020 PY - 2020 T2 - 2020 European Geosciences Union General Assembly TI - Distribution and fractionation of light hydrocarbons related to gas hydrate occurrence and biogenic production at Hikurangi Margin (IODP Site U1517), New Zealand UR - https://doi.org/10.5194/egusphere-egu2020-15046 ID - 14383 ER - TY - CPAPER AU - Heeschen, K.U., Torres, M.E., Pecher, I.A., Schlomer, S., Owari, S., Rose, P.S., Karina, M., Schicks, J.M., Hu, G., Mountjoy, J.J., Barnes, P., LeVay, L.J., Solomon, E.A., Saffer, D.M., Wallace, L., Petronotis, K.E., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Occurrence and fractionation of light hydrocarbons in the gas-hydrate bearing sediments of IODP Site U1517, Hikurangi margin, New Zealand UR - https://abstractsearch.agu.org/meetings/2018/FM/OS13A-06.html ID - 14714 ER - TY - CPAPER AU - Hemming, S.R., Hall, I.R., and LeVay, L. CY - San Francisco, CA DA - 11–15 December 2016 PY - 2016 T2 - 2016 American Geophysical Union Fall Meeting TI - South African climates: highlights from International Ocean Discovery Program Expedition 361 UR - https://abstractsearch.agu.org/meetings/2016/FM/PP42A-08.html ID - 16185 ER - TY - CPAPER AU - Hemming, S.R., Hall, I.R., Just, J., Rasbury, T., Kubota, K., Simon, M., Barker, S., Goldstein, S.L., LeVay, L., Liang, J.A., Estrada, M., Braunthal, A.N., and Expedition 361 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - American Geophysical Union Fall Meeting TI - Timescale of paleoceanographic history at IODP Site U1474, Natal Valley, Southwestern Indian Ocean UR - https://abstractsearch.agu.org/meetings/2018/FM/PP11C-1269.html ID - 49139 ER - TY - JOUR AB - During the Middle Miocene, Earth’s climate transitioned from a relatively warm phase (Miocene climatic optimum) to a colder mode with reestablishment of permanent ice sheets on Antarctica, thus marking a fundamental step in Cenozoic cooling. Carbon sequestration and atmospheric CO2 drawdown through increased terrestrial and/or marine productivity have been proposed as the main drivers of this fundamental transition. We integrate high-resolution (1–3 k.y.) benthic stable isotope data with X-ray fluorescence scanner–derived biogenic silica and carbonate accumulation estimates in an exceptionally well preserved sedimentary archive, recovered at Integrated Ocean Drilling Program Site U1338, to reconstruct eastern equatorial Pacific productivity variations and to investigate temporal links between high- and low-latitude climate change over the interval 16–13 Ma. Our records show that the climatic optimum (16.8–14.7 Ma) was characterized by high-amplitude climate variations, marked by intense perturbations of the carbon cycle. Episodes of peak warmth at (Southern Hemisphere) insolation maxima coincided with transient shoaling of the carbonate compensation depth and enhanced carbonate dissolution in the deep ocean. A switch to obliquity-paced climate variability after 14.7 Ma concurred with a general improvement in carbonate preservation and the onset of stepwise global cooling, culminating with extensive ice growth over Antarctica ca. 13.8 Ma. We find that two massive increases in opal accumulation ca. 14.0 and ca. 13.8 Ma occurred just before and during the final and most prominent cooling step, supporting the hypothesis that enhanced siliceous productivity in the eastern equatorial Pacific contributed to CO2 drawdown. AU - Holbourn, Ann AU - Kuhnt, Wolfgang AU - Lyle, Mitch AU - Schneider, Leah AU - Romero, Oscar AU - Andersen, Nils DO - 10.1130/g34890.1 IS - 1 PY - 2014 SN - 0091-7613 SP - 19–22 ST - Middle Miocene climate cooling linked to intensification of eastern equatorial Pacific upwelling T2 - Geology TI - Middle Miocene climate cooling linked to intensification of eastern equatorial Pacific upwelling UR - https://doi.org/10.1130/G34890.1 VL - 42 Y2 - 10/6/2021 ID - 17108 ER - TY - JOUR AU - Jaeger, John AU - Gulick, Sean AU - Mix, Alan AU - Petronotis, Katerina J2 - Affiliation (analytic): University of Florida, Department of Geological Sciences, Gainesville, FL Coordinates: N531800 N610800 W1384700 W1505800 Contains 205 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Scientific Prospectus (Integrated Ocean Drilling Program), Vol.341, 114p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9415 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2011079218 URL access: Open access DOI: 10.2204/iodp.sp.341.2011 KW - Alaska Boreholes Cenozoic Climate change Climate effects Continental margin Cores Downhole methods Drilling East Pacific Erosion Expedition 341 Expeditions Geophysical methods Geophysical profiles Geophysical surveys Glaciation Gulf of Alaska Integrated Ocean Drilling Program Lithofacies Lithostratigraphy Marine drilling Marine sediments Neogene North America North Pacific Northeast Pacific Orogeny Pacific Ocean Paleo-oceanography Paleoclimatology Planning Quaternary Saint Elias Mountains Sedimentation Sediments Seismic methods Seismic profiles Seismic stratigraphy Surveys Tectonics Tertiary United States Weathering 12 Stratigraphy, Historical Geology and Paleoecology 16 Structural Geology 20 Geophysics, Applied LA - English PY - 2011 SN - 1932-9415 ; ST - Southern Alaska margin: interactions of tectonics, climate, and sedimentation T2 - Integrated Ocean Drilling Program Scientific Prospectus TI - Southern Alaska margin: interactions of tectonics, climate, and sedimentation UR - https://doi.org/10.2204/iodp.sp.341.2011 VL - 341 ID - 4783 ER - TY - BOOK AU - Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., and the Expedition 341 Scientists CY - College Station, TX J2 - Affiliation (analytic): University of Florida, Department of Geological Sciences, Gainesville, FL Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 341 Scientists, College Station, TX Coordinates: N565700 N594200 W1431200 W1470700 Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the Integrated Ocean Drilling Program (Online), Vol.341. Publisher: Integrated Ocean Drilling Program Management International for the Integrated Drilling Program (IODP), Washington, DC, United States. ISSN: 1930-1014 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2014105285 DOI: 10.2204/iodp.proc.341.2014 KW - Alaska Algae Biostratigraphy C-13/C-12 Carbon Cenozoic Chemostratigraphy Climate change Continental margin Cores Diatoms East Pacific Expedition 341 Foraminifera Geophysical methods Geophysical profiles Geophysical surveys Gulf of Alaska IODP Site U1417 IODP Site U1418 IODP Site U1419 IODP Site U1420 IODP Site U1421 Integrated Ocean Drilling Program Invertebrata Isotope ratios Isotopes Lithostratigraphy Magnetic properties Magnetic susceptibility Magnetostratigraphy Microfossils Neogene North Pacific Northeast Pacific O-18/O-16 Oxygen Pacific Ocean Paleo-oceanography Paleoclimatology Paleomagnetism Physical properties Plantae Protista Quaternary Radiolaria Seismic methods Seismic profiles Seismic stratigraphy Southern Alaska Stable isotopes Surveys Tertiary United States Well logs 12 Stratigraphy, Historical Geology and Paleoecology 20 Geophysics, Applied LA - English PB - Integrated Ocean Drilling Program PY - 2014 SN - 1930-1014 ; ST - Proceedings of the Integrated Ocean Drilling Program TI - Proceedings of the Integrated Ocean Drilling Program UR - https://doi.org/10.2204/iodp.proc.341.2014 VL - 341 ID - 4789 ER - TY - CPAPER AU - Jeppson, T., Kitajima, H., Ikari, M., Lee, H., Ito, Y., Harris, R.N., Shreedharan, S., Luo, M., Malie, P.R., Huepers, A., Solomon, E.A., Underwood, M., Kutterolf, S., Meneghini, F., Hashimoto, Y., Engelmann de Oliveira, C., Rabinowitz, H., Noda, A., Fulton, P.M., Saffer, D.M., Wallace, L.M., Barnes, P., Pecher, I.A., Petronotis, K.E., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Lithology and cement controls on the evolution of compressional wave velocity and porosity in input materials at northern Hikurangi and other subduction zones UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0309.html ID - 14715 ER - TY - CPAPER AU - Jiménez-Espejo, F., Gruetzner, J., Bahr, A., Sierro, F.J., Ohkouchi, N., Hall, I.R., Hemming, S.R., LeVay, L.J., and Expedition 361 Scientists CY - National Taiwan University, Taiwan DA - 20–24 March 2017 PY - 2017 T2 - 2017 XRF Core Scanning Conference TI - XRF core-scanning signal interpretation in Miocene carbonate and siliciclastic contourite deposits (IODP sites U1387 and U1475) UR - http://epic.awi.de/44303/ ID - 15391 ER - TY - CPAPER AU - Koge, H., McNamara, D.D., Gamboa, D., Wu, H.-Y., Kim, G.Y., Cardona, S., Shanker, U., Barnes, P., Pecher, I.A., LeVay, L.J., Saffer, D.M., Wallace, L.M., Petronotis, K.E., Noda, A., Morgan, J., Ashi, J., Yamaguchi, A., Yamada, Y., and Hamada, Y. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Constraining the deformation history of the frontal wedge of Hikurangi subduction margin with analog modeling and bedding trends from borehole logging of IODP Expedition 372 UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0302.html ID - 14716 ER - TY - JOUR AB - The paleoclimate and ecosystem variability in Africa during the Plio/Pleistocene has received considerable attention due to its potential links to hominid evolution. However, the reconstruction of this variability hinges critically upon highly temporally resolved proxy data from continuous, well-dated sediment archives. In light of these requirements we use a new XRF core-scanning record from International Ocean Discovery Program (IODP) Site U1478 off the Limpopo River mouth (Mozambique Channel, SW Indian Ocean) spanning the past c. 4 Ma to identify the climate variability in SE Africa. Our results show that the elemental distribution in the Site U1478 cores is mainly controlled by the rate of terrigenous input and – to a lesser extent – by bottom-current transport and post-depositional processes such as propagation of paleoredox boundaries and diagenesis across some intervals. The log(Ti/Ca) ratio, which is used as a tracer of terrigenous sediment input, shows quasi-cyclical variability across the entire record that closely matches the periods of orbital parameters. However, the cyclical behaviour of the log(Ti/Ca) signal varies through time, with the uppermost 106 m of the sequence (0–1.07 Ma) displaying a mix of precession and obliquity signals, the intervals 106–223 m (1.07–2.80 Ma) and 240–257 m (3.68–4.05 Ma) being dominated by precession, and the interval 223–240 m (2.80–3.68 Ma) being controlled by eccentricity. To refine the available chronology for Site U1478, which is based on shipboard biostratigraphic and paleomagnetic data, we have tuned the log(Ti/Ca) record to the LR04 benthic oxygen isotope record, summer insolation at 25° S, and orbital eccentricity depending on the dominant cyclicities in the XRF dataset across individual time intervals. The resulting chronology enables us to evaluate the XRF data as well as the previously available shipboard sedimentological and geochemical datasets within a regional and global climatic context. This allows the connection of a c. 7-m-thick contourite deposit and a prominent paleoredox boundary to hydroclimate and ocean-circulation changes during the early Pleistocene and across the Mid-Pleistocene Transition, respectively. Moreover, a decoupling of the log(Ti/Ca) and the log(Ti/K) records, with the latter indicating the degree of sediment weathering, from 3.2 to 2.8 Ma points to an increased delivery of highly weathered sediments to Site U1478. We attribute this to temporarily wetter and warmer conditions in the catchment of the Limpopo River and/or a change in the sediment source, perhaps associated with the tectonically driven enlargement of the Zambezi River catchment during the late Pliocene/early Pleistocene. AU - Koutsodendris, Andreas AU - Nakajima, Kai AU - Kaboth-Bahr, Stefanie AU - Berke, Melissa A. AU - Franzese, Allison M. AU - Hall, Ian R. AU - Hemming, Sidney R. AU - Just, Janna AU - LeVay, Leah J. AU - Pross, Jörg AU - Robinson, Rebecca IS - 2 N1 - Koutsodendris, Andreas; Nakajima, Kai; Kaboth-Bahr, Stefanie; Berke, Melissa A.; Franzese, Allison M.; Hall, Ian R.; Hemming, Sidney R.; Just, Janna; LeVay, Leah J.; Pross, Jörg; Robinson, Rebecca PY - 2021 SP - 159–181 ST - A Plio-Pleistocene (c. 0–4 Ma) cyclostratigraphy for IODP Site U1478 (Mozambique Channel, SW Indian Ocean): exploring an offshore record of paleoclimate and ecosystem variability in SE Africa T2 - Newsletters on Stratigraphy TI - A Plio-Pleistocene (c. 0–4 Ma) cyclostratigraphy for IODP Site U1478 (Mozambique Channel, SW Indian Ocean): exploring an offshore record of paleoclimate and ecosystem variability in SE Africa UR - https://doi.org/10.1127/nos/2020/0608 VL - 54 ID - 7655 ER - TY - JOUR AU - Lathika, N., Rahaman, W., Hemming, S.R., Thamban, M., Hall, I.R., LeVay, L.J., and the Expedition 361 Scientific Party PY - 2017 ST - Evolution of deep-water circulation in the Indian-Atlantic ocean gateway since late Miocene from authigenic neodymium isotope records T2 - Goldschmidt 2017 Abstracts TI - Evolution of deep-water circulation in the Indian-Atlantic ocean gateway since late Miocene from authigenic neodymium isotope records ID - 49142 ER - TY - JOUR AU - LeVay, L.J., Bralower, T.J., Fox, L., Holbourn, A., Kump, L.R., Romero, O.E., and Wade, B.S. IS - 6 PY - 2014 SP - 276 ST - Enhanced calcareous nannoplankton productivity during the middle Miocene transition in the eastern equatorial Pacific T2 - Geological Society of American Abstracts with Programs TI - Enhanced calcareous nannoplankton productivity during the middle Miocene transition in the eastern equatorial Pacific VL - 46 ID - 49126 ER - TY - CPAPER AU - LeVay, L.J., Romero, O.E., McClymont, E., Miller, J., Penkrot, M.L., Jaeger, J.M., Mix, A., and Walczak, M. CY - San Francisco, CA DA - 11–15 December 2016 N1 - Abstract PP51D-2347 PY - 2016 T2 - 2016 American Geophysical Union Fall Meeting TI - Late Pleistocene-Holocene phytoplankton productivity in the Gulf of Alaska, IODP Site U1419 UR - https://abstractsearch.agu.org/meetings/2016/FM/PP51D-2347.html ID - 15460 ER - TY - CPAPER AU - LeVay, L.J., Edgar, K.M., Hanson, E.M., Bogus, K.A., and Huber, B. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Calcareous nannofossils from a new high-latitude PETM section: IODP Site U1514, Mentelle Basin, southeast Indian Ocean UR - https://abstractsearch.agu.org/meetings/2018/FM/PP21G-1495.html ID - 15165 ER - TY - CPAPER AU - Littler, K., Clemens, S., Kuhnt, W., LeVay, L., and the Expedition 353 Scientific Party CY - Newcastle upon Tyne, UK DA - 25 September 2015 PY - 2015 T2 - 2015 UK IODP General Conference TI - High-resolution records of Indian Monsoon variability: preliminary results from Expedition 353 ID - 15969 ER - TY - JOUR AB - Integrated Ocean Drilling Program Expedition 320/321, "Pacific Equatorial Age Transect" (Sites U1331-U1338), was designed to recover a continuous Cenozoic record of the equatorial Pacific by coring above the paleoposition of the equator at successive crustal ages on the Pacific plate. These sediments record the evolution of the equatorial climate system throughout the Cenozoic. As we have gained more information about the past movement of plates and when in Earth's history "critical" climate events took place, it became possible to drill an age-transect ("flow-line") along the position of the paleoequator in the Pacific, targeting important time intervals to reconstruct how the equatorial Pacific was involved in the climate change. The Pacific Equatorial Age Transect (PEAT) program cored eight sites from the sediment surface to basement, with basalt aged between 53 and 18 Ma, covering the time period following maximum Cenozoic warmth, through initial major glaciations, to today. The PEAT program allows the reconstruction of extreme changes of the calcium carbonate compensation depth (CCD) across major geological boundaries during the last 53 m.y. A very shallow CCD during most of the Paleogene makes it difficult to obtain well-preserved carbonate sediments during these stratigraphic intervals, but we recovered a unique sedimentary biogenic sediment archive for time periods just after the Paleocene/Eocene boundary event, the Eocene cooling, the Eocene-Oligocene transition, the "one cold pole" Oligocene, the Oligocene-Miocene transition, and the middle Miocene cooling. Together with older Deep Sea Drilling Project and Ocean Drilling Program drilling in the equatorial Pacific, we can also delineate the position of the paleoequator and variations in sediment thickness from ∼150°W to 110°W longitude. Expedition 321, the second part of the PEAT program, focused on the time period roughly from 25 Ma forward. During Expedition 321 two major Neogene equatorial Pacific sediment sections were recovered at Sites U1337 and U1338. AU - Lyle, M., Raffi, I., Pälike, H., Nishi, H., Gamage, K., Klaus, A., and the Expedition 320/321 Scientist J2 - Affiliation (analytic): Texas A&M University, Department of Oceanography, College Station, TX Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX Coordinates: N023028 N035000 W1175810 W1231223 Contains 92 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Report (Integrated Ocean Drilling Program), Vol.321, 112p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2009098180 DOI: 10.2204/iodp.pr.321.2009 KW - Algae Boreholes Carbon Carbon cycle Carbonate compensation depth Cenozoic Chemically precipitated rocks Chemostratigraphy Chert Chronostratigraphy Climate change Cores Correlation Diatoms Drilling East Pacific Equatorial Pacific Expeditions 320/321 Foraminifera Geochemical cycle Geochemistry IODP Site U1331 IODP Site U1332 IODP Site U1333 IODP Site U1334 IODP Site U1335 IODP Site U1336 IODP Site U1337 IODP Site U1338 Integrated Ocean Drilling Program Invertebrata Isotope ratios Isotopes Lithostratigraphy Magnetostratigraphy Marine drilling Marine sedimentation Marine sediments Microfossils Nannofossils O-18/O-16 Organic compounds Oxygen Pacific Ocean Paleo-oceanography Paleoclimatology Paleoecology Paleoenvironment Paleomagnetism Paleotemperature Plantae Productivity Protista Radiolaria Reconstruction Sea-surface temperature Sedimentary rocks Sedimentation Sedimentation rates Sediments Stable isotopes Tertiary Total organic carbon Well logs 12 Stratigraphy, Historical Geology and Paleoecology LA - English N1 - Lyle, Mitchell W. Raffi, Isabella Palike, Heiko Nishi, Hiroshi Gamage, Kusali Klaus, Adam Evans, Helen Williams, Trevor Acton, Gary D. Bown, Paul Delaney, Margaret Jones, Tom Dunkley Edgar, Kirsty Fitch, Peter Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kamikuri, Shin-ichi Kuroda, Junichiro Leon-Rodriguez, Lizette Moore, Theodore, Jr. Murphy, Brandon Nakamura, Hideto Ohneiser, Christian Richter, Carl Robinson, Rebecca Sawada, Ken Scher, Howie Takata, Hiroyuki Westerhold, Thomas Wilson, Paul A. Yamamoto, Yuhji Malinverno, Alberto Anderson, Louise Backman, Jan Beltran, Catherine Busch, William Channell, James Dewangan, Pawan Hasegawa, Hitoshi Hathorne, Ed Hayashi, Hiroki Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsunori Murphy, Daniel Ogane, Kaoru Romero, Oscar Schneider, Leah Sluijs, Appy Jun Tian Tsujimoto, Akira Wade, Bridget Wilkens, Roy Yamamoto, Shinya Yamazaki, Toshitsugu PY - 2009 SN - 1932-9423 ; ST - Pacific Equatorial Transect T2 - Integrated Ocean Drilling Program Preliminary Report TI - Pacific Equatorial Transect UR - https://doi.org/10.2204/iodp.pr.321.2009 VL - 321 ID - 4080 ER - TY - JOUR AU - Lyle, M., Pälike, H., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the IODP Expeditions 320/321 Science Party J2 - Affiliation (analytic): Texas A&M University, Department of Oceanography, College Station, TX Affiliation (monographic): Texas A&M University, Department of Oceanography, College Station, TX, United States Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 320, Shipboard Scientific Party, College Station, TX Coordinates: N023000 N120500 W1175800 W1421000 illus., incl. sketch map Contains 48 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Scientific Drilling, Vol.9, p.4-15. Publisher: Integrated Ocean Drilling Program Management International, Sapporo; Washington, DC, International. ISSN: 1816-8957 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2010072179 URL access: Open access DOI: 10.2204/iodp.sd.9.01.2010 KW - Boreholes Cenozoic Chemostratigraphy Cores Drilling East Pacific Eastern Equatorial Pacific Equatorial Pacific Expeditions Expeditions 320/321 Geophysical methods Integrated Ocean Drilling Program Isotope ratios Isotopes Lithostratigraphy Marine drilling North Pacific Northeast Pacific O-18/O-16 Oxygen Pacific Equatorial Age Transect Pacific Ocean Paleo-oceanography Paleoclimatology Paleoenvironment Programs Quaternary Reconstruction Sedimentary rocks Sedimentation Sedimentation rates Seismic methods Seismic stratigraphy Stable isotopes Tertiary 12 Stratigraphy, Historical Geology and Paleoecology LA - English N1 - Lyle, Mitchell Palike, Heiko Nishi, Hiroshi Raffi, Isabella Gamage, Kusali Klaus, Adam Acton, Gary Bown, Paul Delany, Margaret Dunkley Jones, Tom Edgar, Kirsty Evans, Helen Fitch, Peter Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kamikuri, Shin-ichi Kuroda, Junichiro Leon-Rodriguez, Lizette Moore, Theodore, Jr. Murphy, Brandon Nakamura, Hideto Ohneiser, Christian Richter, Carl Robinson, Rebecca Sawada, Ken Scher, Howie Takata, Hiroyuki Westerhold, Thomas Williams, Trevor Wilson, Paul Yamamoto, Yuhji Anderson, Louise Backman, Jan Beltran, Catherine Busch, William Channell, James E. T. Dewangan, Pawan Hasegawa, Hitoshi Hathorne, Ed Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsumori Malinverno, Alberto Murphy, Daniel Ogane, Kaoru Romero, Oscar Schneider, Leah Sluijs, Appy Tian, Jun Tsujimoto, Akira Wade, Bridget Wilkens, Roy Yamamoto, Shinya Yamazaki, Toshitsugu PY - 2010 SN - 1816-8957 SP - 4–15 ST - The Pacific Equatorial Age Transect, IODP Expeditions 320 and 321: building a 50-million-year-long environmental record of the Equatorial Pacific Ocean T2 - Scientific Drilling TI - The Pacific Equatorial Age Transect, IODP Expeditions 320 and 321: building a 50-million-year-long environmental record of the Equatorial Pacific Ocean UR - https://doi.org/10.2204/iodp.sd.9.01.2010 VL - 9 ID - 4101 ER - TY - JOUR AU - März, C., Mix, A.C., McClymont, E., Nakamura, A., Berbel, G., Gulick, S., Jaeger, J., Schneider, L., and the Expedition 341 Scientists Team PY - 2014 SP - EGU2014-4860 ST - Variations of marine pore water salinity and chlorinity in Gulf of Alaska sediments (IODP Expedition 341) T2 - Geophysical Research Abstracts TI - Variations of marine pore water salinity and chlorinity in Gulf of Alaska sediments (IODP Expedition 341) UR - http://meetingorganizer.copernicus.org/EGU2014/EGU2014-4860.pdf VL - 16 ID - 15474 ER - TY - JOUR AB - Early Paleogene neodymium (Nd) isotopic reconstructions of ocean circulation in the Pacific suggest a bipolar mode of overturning circulation characterized by convection of deep-water masses from 70 to at least 40 Ma. This mode is fundamentally different from the "sluggish, diffusive" mode that characterizes the modern North Pacific. Therefore, major reorganization of Pacific circulation must have occurred between 40 Ma and the modern. To investigate the potential timing of such a reorganization, we present new Nd isotope data from drill sites spanning 40 to 10 Ma. Here, we use Nd isotopic analyses to identify the sources of dissolved Nd to the Pacific in order to evaluate the application of the Nd proxy for ancient water mass composition. We combine analyses of fossil fish debris, sequentially leached oxide coatings and leach residues to further refine our understanding of Nd marine geochemical cycling and to contribute new constraints on the paleoceanographic history of the Pacific. Overall, these data support previous interpretations of the convection of deep water in the Pacific sector of the Southern Ocean and surface-ventilated North Pacific Deep Water formation from ∼70 to 40 Ma. The new Nd isotope data suggest a gradual transition between 36 and 25 Ma, a time period characterized by global cooling. This transition consists of a change from North Pacific Nd isotopic signatures controlled by convection and water mass mixing to values heavily influenced by overprinting from other sources of Nd to the deep Pacific. Such a transition is consistent with a change in overturning circulation from a "Paleogene mode" to a mode dominated by sluggish diffusive mixing. After 25 Ma the data indicate a significant contribution of radiogenic dissolved Nd to the deep waters of the North Pacific. The most likely source of radiogenic dissolved Nd would have been labile volcanic ash that altered the composition of the water mass as it slowly advected through the North Pacific. A slowing of overturning circulation in the North Pacific could have resulted in diminished poleward heat transport, increasing equator to pole thermal gradients and contributing to a cooling global climate. AU - McKinley, Claire C. AU - Thomas, Deborah J. AU - LeVay, Leah J. AU - Rolewicz, Zachary J2 - Affiliation (analytic): Texas A&M University, Department of Oceanography, College Station, TX Affiliation (monographic): Texas A&M University, Department of Oceanography, College Station, TX, United States Coordinates: N323900 N324000 E1583100 E1583000; N395139 N395139 E1735320 E1735320; S235113 S235111 W1653916 W1653917; S415107 S415107 W1530623 W1530623 illus., incl. 2 tables, sketch maps Contains 53 references Research Program: DSDP Deep Sea Drilling Project; IODP Integrated Ocean Drilling Program; IPOD International Phase of Ocean Drilling; ODP Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Earth and Planetary Science Letters, Vol.521, p.139-149. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands GeoRef ID: 2019077873 DOI: 10.1016/j.epsl.2019.06.009 KW - Cenozoic Convection DSDP Site 464 DSDP Site 596 Deep Sea Drilling Project East Pacific Expedition 329 Hess Rise IODP Site U1370 IPOD Integrated Ocean Drilling Program Isotope ratios Isotopes Leg 198 Leg 62 Leg 91 Mass spectra Metals Mixing Nd-144/Nd-143 Neodymium North Pacific North Pacific Deep Water Northwest Pacific ODP Site 1209 Ocean Drilling Program Ocean circulation Overprinting Pacific Ocean Paleo-oceanography Paleoclimatology Paleogene Rare earths Reconstruction Sea water Shatsky Rise South Pacific Southeast Pacific Spectra Stable isotopes Tertiary Thermal ionization mass spectra Ventilation West Pacific 02 Geochemistry 12 Stratigraphy, Historical Geology and Paleoecology LA - English PY - 2019 SN - 0012-821X SP - 139–149 ST - Nd isotopic structure of the Pacific Ocean 40–10 Ma, and evidence for the reorganization of deep North Pacific ocean circulation between 36 and 25 Ma T2 - Earth and Planetary Science Letters TI - Nd isotopic structure of the Pacific Ocean 40–10 Ma, and evidence for the reorganization of deep North Pacific ocean circulation between 36 and 25 Ma UR - https://doi.org/10.1016/j.epsl.2019.06.009 VL - 521 ID - 639 ER - TY - JOUR AB - Abstract We constrain orientations of the horizontal stress field from borehole image data in a transect across the Hikurangi Subduction Margin. This region experiences NW-SE convergence and is the site of recurrent slow slip events. The direction of the horizontal maximum stress is E-W at an active splay thrust fault near the subduction margin trench. This trend changes to NNW-SSE in a forearc trench slope basin on the offshore accretionary wedge, and to NE-SW in the onshore forearc. Multiple, tectonic, and geological processes, either individually or in concert, may explain this variability. The observed offshore to onshore stress rotation may reflect a change from dominantly compressional tectonics at the deformation front, to a strike-slip and/or extensional tectonic regime closer to the Taupo Volcanic Zone, further inland. In addition, the offshore stress may be affected by topography and/or stress rotation around subducting seamounts, and/or temporal stress changes during the slow slip cycle. AU - McNamara, D. D. AU - Behboudi, E. AU - Wallace, L. AU - Saffer, D. AU - Cook, A. E. AU - Fagereng, A. AU - Paganoni, M. AU - Wu, Hung-Yu AU - Kim, G. AU - Lee, H. AU - Savage, H. M. AU - Barnes, P. AU - Pecher, I. AU - LeVay, L. J. AU - Petronotis, K. E. DO - https://doi.org/10.1029/2020GL091707 IS - 5 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GL091707 PY - 2021 SN - 0094-8276 SP - e2020GL091707 ST - Variable in situ stress orientations across the northern Hikurangi subduction margin T2 - Geophysical Research Letters TI - Variable in situ stress orientations across the northern Hikurangi subduction margin UR - https://doi.org/10.1029/2020GL091707 VL - 48 ID - 12558 ER - TY - CPAPER AU - Meneghini, F., Boschi, C., Fagereng, A., Morgan, J., Underwood, M., Hashimoto, Y., Engelmann de Oliveira, C., Kutterolf, S., Noda, A., Rabinowitz, H.S., Savage, H.M., Wang, M., Wallace, L.M., Saffer, D.M., Barnes, P., Pecher, I.A., Petronotis, K.E., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Lithification of volcaniclastic deposits in the Hikurangi subduction zone: preliminary characterization of fluid circulation in the incoming plate, and volatiles entering the trench UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0308.html ID - 14719 ER - TY - CPAPER AU - Nole, M., Daigle, H., Dugan, B., Clennell, M.B., Paganoni, M., Barnes, P., Pecher, I.A., LeVay, L., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Pore morphology, permeability, and constraints on gas hydrate accumulation in sediments from the Tuaheni Landslide Complex, NZ UR - https://abstractsearch.agu.org/meetings/2018/FM/OS51F-1331.html ID - 14721 ER - TY - CPAPER AU - Nole, Michael AU - Daigle, Hugh AU - Dugan, Brandon AU - Clennell, Michael B AU - Paganoni, Matteo AU - Barnes, Philip AU - Pecher, Ingo Andreas AU - LeVay, Leah CY - Washington, DC DA - 10–14 December 2018 PY - 2018 SP - OS51F-1331 T2 - 2018 American Geophysical Union Fall Meeting TI - Pore morphology, permeability, and constraints on gas hydrate accumulation in sediments from the Tuaheni Landslide Complex, NZ UR - https://abstractsearch.agu.org/meetings/2018/FM/OS51F-1331.html ID - 12546 ER - TY - JOUR AB - Integrated Ocean Drilling Program Expedition 320/321, "Pacific Equatorial Age Transect" (Sites U1331-U1338), was designed to recover a continuous Cenozoic record of the paleoequatorial Pacific by coring above the paleoposition of the Equator at successive crustal ages on the Pacific plate. These sediments record the evolution of the paleoequatorial climate system throughout the Cenozoic. As we gained more information about the past movement of plates and when in Earth's history "critical" climate events took place, it became possible to drill an age transect ("flow line") along the position of the paleoequator in the Pacific, targeting important time slices where the sedimentary archive allows us to reconstruct past climatic and tectonic conditions. The Pacific Equatorial Age Transect (PEAT) program cored eight sites from the sediment surface to at or near basement, with basalt aged between 53 and 16 Ma, covering the time period following maximum Cenozoic warmth, through initial major glaciations, to today. The PEAT program allows the reconstruction of extreme changes of the calcium carbonate compensation depth (CCD) across major geological boundaries during the last 53 m.y. A very shallow CCD during most of the Paleogene makes it difficult to obtain well-preserved carbonate sediments during these stratigraphic intervals, but we recovered a unique sedimentary biogenic sediment archive for time periods just after the Paleocene/Eocene boundary event, the Eocene cooling, the Eocene-Oligocene transition, the "one cold pole" Oligocene, the Oligocene-Miocene transition, and the middle Miocene cooling. Together with older Deep Sea Drilling Project and Ocean Drilling Program drilling in the equatorial Pacific, we can also delineate the position of the paleoequator and variations in sediment thickness from ∼150°W to 110°W longitude. AU - Pälike, H., Nishi, H., Lyle, M., Raffi, I., Klaus, A., Gamage, K., and the Expedition 320/321 Scientists J2 - Affiliation (analytic): National Oceanography Centre-Southampton, School of Ocean and Earth Science, Southampton Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX Coordinates: N120405 N120405 W1420943 W1420943; N115443 N115443 W1410244 W1410244; N103100 N103100 W1382510 W1382510; N080000 N080000 W1315825 W1315825; N051844 N051844 W1261700 W1261700; N074204 N074204 W1281515 W1281515 Contains 91 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Report (Integrated Ocean Drilling Program), Vol.320, 175p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2009068408 DOI: 10.2204/iodp.pr.320.2009 KW - Algae Basalts Biostratigraphy Boreholes Calcium carbonate Carbonate sediments Cenozoic Chemostratigraphy Cores Correlation Crust Drilling Eocene Equatorial Pacific Expedition 320 Foraminifera Geochemistry Gravity flows IODP Site U1331 IODP Site U1332 IODP Site U1333 IODP Site U1334 IODP Site U1335 IODP Site U1336 Igneous rocks Integrated Ocean Drilling Program Invertebrata Lithostratigraphy Magnetic properties Magnetic susceptibility Magnetostratigraphy Marine drilling Marine sediments Microfossils Mid-ocean ridge basalts Miocene Nannofossils Neogene Oceanic crust Oligocene Pacific Equatorial Age Transect Pacific Ocean Paleo-oceanography Paleoclimatology Paleogene Paleogeography Paleomagnetism Paleotemperature Plantae Plate tectonics Pore water Productivity Protista Radiolaria Reconstruction Sedimentary rocks Sedimentation Sedimentation rates Sediments Seismic stratigraphy Tertiary Volcanic rocks 12 Stratigraphy, Historical Geology and Paleoecology LA - English N1 - Palike, Heiko Nishi, Hiroshi Lyle, Mitchell Raffi, Isabella Klaus, Adam Gamage, Kusali Evans, Helen Williams, Trevor Acton, Gary D. Bown, Paul Delaney, Margaret Dunkley Jones, Tom Edgar, Kirsty Fitch, Peter Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kamikuri, Shin-ichi Kuroda, Junichiro Leon-Rodriguez, Lizette Moore, Theodore, Jr. Murphy, Brandon Nakamura, Hideto Ohneiser, Christian Richter, Carl Robinson, Rebecca Sawada, Ken Scher, Howie Takata, Hiroyuki Westerhold, Thomas Wilson, Paul A. Yamamoto, Yuhji Malinverno, Alberto Anderson, Louise Backman, Jan Beltran, Catherine Busch, William Channell, James E. T. Dewangan, Pawan Hasegawa, Hitochi Hathorne, Edmund Hayashi, Hiroki Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsumori Murphy, Daniel Ogane, Haoru Romero, Oscar E. Schneider, Leah Sluijs, Appy Jun Tian Tsujimoto, Akira Wade, Bridget Wilkens, Roy H. Yamamoto, Shinya Yamazaki, Toshitsugu PY - 2009 SN - 1932-9423 ; ST - Pacific Equatorial Transect T2 - Integrated Ocean Drilling Program Preliminary Report TI - Pacific Equatorial Transect UR - https://doi.org/10.2204/iodp.pr.320.2009 VL - 320 ID - 4079 ER - TY - BOOK AU - Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists CY - Tokyo J2 - Affiliation (analytic): National Oceanography Centre-Southampton, School of Ocean and Earth Science, Southampton Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX Coordinates: N023000 N120500 W1175800 W1421000 Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the Integrated Ocean Drilling Program, Vol.320/321. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2010100912 DOI: 10.2204/iodp.proc.320321.2010 KW - Algae Basement Biostratigraphy Boreholes Calcium carbonate Carbonate compensation depth Cenozoic Chemostratigraphy Cores Crust Diatoms Downhole methods Drilling East Pacific Equatorial Pacific Expeditions 320/321 Foraminifera Heat flow IODP Site U1331 IODP Site U1332 IODP Site U1333 IODP Site U1334 IODP Site U1335 IODP Site U1336 IODP Site U1337 IODP Site U1338 Igneous rocks Integrated Ocean Drilling Program Invertebrata Lithostratigraphy Magnetostratigraphy Marine drilling Marine sediments Microfossils Nannofossils North Pacific Northeast Pacific Oceanic crust Organic compounds Pacific Equatorial Age Transect Pacific Ocean Paleo-oceanography Paleoclimatology Paleoenvironment Paleomagnetism Paleotemperature Physical properties Plantae Productivity Protista Radiolaria Reconstruction Sedimentary rocks Sedimentation Sedimentation rates Sediments Seismic stratigraphy Tertiary Total organic carbon Well logs 12 Stratigraphy, Historical Geology and Paleoecology 20 Geophysics, Applied LA - English N1 - Pälike, Heiko Nishi, Hiroshi Klaus, Adam Evans, Helen Williams, Trevor Acton, Gary D. Bown, Paul Delaney, Margaret Jones, Tom Dunkley Edgar, Kirsty Fitch, Peter Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kamikuri, Shin-ichi Kuroda, Junichiro Leon-Rodriguez, Lizette Moore, Theodore, Jr. Murphy, Brandon Nakamura, Hideto Ohneiser, Christian Richter, Carl Robinson, Rebecca Sawada, Ken Scher, Howie Takata, Hiroyuki Westerhold, Thomas Wilson, Paul A. Yamamoto, Yuhji Lyle, Mitchell W. Raffi, Isabella Gamage, Kusali Anderson, Louise Malinverno, Alberto Backman, Jan Beltran, Catherine Busch, William Channell, James Dewangan, Pawan Hasegawa, Hitoshi Hathorne, Edmund Hayashi, Hiroki Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsunori Murphy, Daniel Ogane, Kaoru Romero, Oscar Schneider, Leah Sluijs, Appy Jun Tian Tsujimoto, Akira Wade, Bridget Wilkens, Roy Yamamoto, Shinya Yamazaki, Toshitsugu PB - Integrated Ocean Drilling Program Management International, Inc. PY - 2010 SN - 1930-1014 ; ST - Proceedings of the Integrated Ocean Drilling Program TI - Proceedings of the Integrated Ocean Drilling Program UR - https://doi.org/10.2204/iodp.proc.320321.2010 VL - 320/321 ID - 4106 ER - TY - JOUR AB - Atmospheric carbon dioxide concentrations and climate are regulated on geological timescales by the balance between carbon input from volcanic and metamorphic outgassing and its removal by weathering feedbacks; these feedbacks involve the erosion of silicate rocks and organic-carbon-bearing rocks. The integrated effect of these processes is reflected in the calcium carbonate compensation depth, which is the oceanic depth at which calcium carbonate is dissolved. Here we present a carbonate accumulation record that covers the past 53 million years from a depth transect in the equatorial Pacific Ocean. The carbonate compensation depth tracks long-term ocean cooling, deepening from 3.0–3.5 kilometres during the early Cenozoic (approximately 55 million years ago) to 4.6 kilometres at present, consistent with an overall Cenozoic increase in weathering. We find large superimposed fluctuations in carbonate compensation depth during the middle and late Eocene. Using Earth system models, we identify changes in weathering and the mode of organic-carbon delivery as two key processes to explain these large-scale Eocene fluctuations of the carbonate compensation depth. AU - Pälike, Heiko AU - Lyle, Mitchell W. AU - Nishi, Hiroshi AU - Raffi, Isabella AU - Ridgwell, Andy AU - Gamage, Kusali AU - Klaus, Adam AU - Acton, Gary AU - Anderson, Louise AU - Backman, Jan AU - Baldauf, Jack AU - Beltran, Catherine AU - Bohaty, Steven M. AU - Bown, Paul AU - Busch, William AU - Channell, Jim E. T. AU - Chun, Cecily O. J. AU - Delaney, Margaret AU - Dewangan, Pawan AU - Dunkley Jones, Tom AU - Edgar, Kirsty M. AU - Evans, Helen AU - Fitch, Peter AU - Foster, Gavin L. AU - Gussone, Nikolaus AU - Hasegawa, Hitoshi AU - Hathorne, Ed C. AU - Hayashi, Hiroki AU - Herrle, Jens O. AU - Holbourn, Ann AU - Hovan, Steve AU - Hyeong, Kiseong AU - Iijima, Koichi AU - Ito, Takashi AU - Kamikuri, Shin-ichi AU - Kimoto, Katsunori AU - Kuroda, Junichiro AU - Leon-Rodriguez, Lizette AU - Malinverno, Alberto AU - Moore Jr, Ted C. AU - Murphy, Brandon H. AU - Murphy, Daniel P. AU - Nakamura, Hideto AU - Ogane, Kaoru AU - Ohneiser, Christian AU - Richter, Carl AU - Robinson, Rebecca AU - Rohling, Eelco J. AU - Romero, Oscar AU - Sawada, Ken AU - Scher, Howie AU - Schneider, Leah AU - Sluijs, Appy AU - Takata, Hiroyuki AU - Tian, Jun AU - Tsujimoto, Akira AU - Wade, Bridget S. AU - Westerhold, Thomas AU - Wilkens, Roy AU - Williams, Trevor AU - Wilson, Paul A. AU - Yamamoto, Yuhji AU - Yamamoto, Shinya AU - Yamazaki, Toshitsugu AU - Zeebe, Richard E. DA - 2012/08/01 DO - 10.1038/nature11360 IS - 7413 PY - 2012 SN - 1476-4687 SP - 609–614 ST - A Cenozoic record of the equatorial Pacific carbonate compensation depth T2 - Nature TI - A Cenozoic record of the equatorial Pacific carbonate compensation depth UR - https://doi.org/10.1038/nature11360 VL - 488 ID - 17105 ER - TY - JOUR AU - Parnell-Turner, R., Briais, A., and LeVay, L.J. PY - 2022 ST - Expedition 395C Preliminary Report: Reykjanes Mantle Convection and Climate: Crustal Objectives T2 - International Ocean Discovery Program TI - Expedition 395C Preliminary Report: Reykjanes Mantle Convection and Climate: Crustal Objectives UR - https://doi.org/10.14379/iodp.pr.395C.2022 ID - 21316 ER - TY - BOOK AB - The intersection between the Mid-Atlantic Ridge and Iceland hotspot provides a natural laboratory where the composition and dynamics of Earth's upper mantle can be observed. Plume-ridge interaction drives variations in the melting regime, which result in a range of crustal types, including a series of V-shaped ridges (VSRs) and V-shaped troughs (VSTs) south of Iceland. Time-dependent mantle upwelling beneath Iceland dynamically supports regional bathymetry and leads to changes in the height of oceanic gateways, which in turn control the flow of deep water on geologic timescales. Expedition 395 has three objectives: (1) to test contrasting hypotheses for the formation of VSRs, (2) to understand temporal changes in ocean circulation and explore connections with plume activity, and (3) to reconstruct the evolving chemistry of hydrothermal fluids with increasing crustal age and varying sediment thickness and crustal architecture. This expedition will recover basaltic samples from crust that is blanketed by thick sediments and is thus inaccessible when using dredging. Major, trace, and isotope geochemistry of basalts will allow us to observe spatial and temporal variations in mantle melting processes. We will test the hypothesis that the Iceland plume thermally pulses on two timescales (5-10 and ∼30 Ma), leading to fundamental changes in crustal architecture. This idea will be tested against alternative hypotheses involving propagating rifts and buoyant mantle upwelling. Millennial-scale paleoclimate records are contained in rapidly accumulated sediments of contourite drifts in this region. The accumulation rate of these sediments is a proxy for current strength, which is moderated by dynamic support of oceanic gateways such as the Greenland-Scotland Ridge. These sediments also provide constraints for climatic events including Pliocene warmth, the onset of Northern Hemisphere glaciation, and abrupt Late Pleistocene climate change. Our combined approach will explore relationships between deep Earth processes, ocean circulation, and climate. Our objectives will be addressed by recovering sedimentary and basaltic cores, and we plan to penetrate ∼130 m into igneous basement at five sites east of Reykjanes Ridge. Four sites intersect VSR/VST pairs, one of which coincides with Björn drift. A fifth site is located over 32.4 My old oceanic crust that is devoid of V-shaped features. This site was chosen because it intersects Oligocene-Miocene sediments of Gardar drift. Recovered sediments and basalts will provide a major advance in our understanding of mantle dynamics and the linked nature of Earth's interior, oceans, and climate. AU - Parnell-Turner, Ross AU - Briais, Anne AU - LeVay, Leah CY - International Ocean Discovery Program J2 - Affiliation (analytic): Scripps Institution of Oceanography, San Diego, CA Coordinates: N600000 N610000 W0220000 W0290000 Contains 45 references Research Program: IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Scientific Prospectus (International Ocean Discovery Program), Vol.395, 33p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2332-1385 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2020056619 URL access: Open access DOI: 10.14379/iodp.sp.395.2020 KW - Atlantic Ocean Basalts Basement Cenozoic Chemical composition Convection Crust Drilling Expedition 395 Geophysical methods Geophysical profiles Geophysical surveys Hydrothermal alteration Igneous rocks International Ocean Discovery Program Mantle Marine sediments Metasomatism Neogene North Atlantic Oceanic crust Paleo-oceanography Paleoclimatology Pleistocene Pliocene Quaternary Reykjanes Ridge Sediments Seismic methods Seismic profiles Surveys Tertiary Volcanic rocks Well-logging 18 Geophysics, Solid-Earth 20 Geophysics, Applied LA - English PY - 2020 SN - 2332-1385 ; ST - Expedition 395 Scientific Prospectus: Reykjanes Mantle Convection and Climate TI - Expedition 395 Scientific Prospectus: Reykjanes Mantle Convection and Climate UR - https://doi.org/10.14379/iodp.sp.395.2020 ID - 5531 ER - TY - BOOK AB - International Ocean Discovery Program (IODP) Expedition 372 combined two research topics, slow slip events (SSEs) on subduction faults (IODP Proposal 781A-Full) and actively deforming gas hydrate-bearing landslides (IODP Proposal 841-APL). Our study area on the Hikurangi margin, east of the coast of New Zealand, provided unique locations for addressing both research topics. SSEs at subduction zones are an enigmatic form of creeping fault behavior. They typically occur on subduction zones at depths beyond the capabilities of ocean floor drilling. However, at the northern Hikurangi subduction margin they are among the best-documented and shallowest on Earth. Here, SSEs may extend close to the trench, where clastic and pelagic sediments about 1.0-1.5 km thick overlie the subducting, seamount-studded Hikurangi Plateau. Geodetic data show that these SSEs recur about every 2 years and are associated with measurable seafloor displacement. The northern Hikurangi subduction margin thus provides an excellent setting to use IODP capabilities to discern the mechanisms behind slow slip fault behavior. Expedition 372 acquired logging-while-drilling (LWD) data at three subduction-focused sites to depths of 600, 650, and 750 meters below seafloor (mbsf), respectively. These include two sites (U1518 and U1519) above the plate interface fault that experiences SSEs and one site (U1520) in the subducting "inputs" sequence in the Hikurangi Trough, 15 km east of the plate boundary. Overall, we acquired excellent logging data and reached our target depths at two of these sites. Drilling and logging at Site U1520 did not reach the planned depth due to operational time constraints. These logging data will be augmented by coring and borehole observatories planned for IODP Expedition 375. Gas hydrates have long been suspected of being involved in seafloor failure; not much evidence, however, has been found to date for gas hydrate-related submarine landslides. Solid, ice-like gas hydrate in sediment pores is generally thought to increase seafloor strength, as confirmed by a number of laboratory measurements. Dissociation of gas hydrate to water and overpressured gas, on the other hand, may weaken and destabilize sediments, potentially causing submarine landslides. The Tuaheni Landslide Complex (TLC) on the Hikurangi margin shows evidence for active, creeping deformation. Intriguingly, the landward edge of creeping coincides with the pinch-out of the base of gas hydrate stability on the seafloor. We therefore hypothesized that gas hydrate may be linked to creep-like deformation and presented several hypotheses that may link gas hydrates to slow deformation. Alternatively, creeping may not be related to gas hydrates but instead be caused by repeated pressure pulses or linked to earthquake-related liquefaction. Expedition 372 comprised a coring and LWD program to test our landslide hypotheses. Due to weather-related downtime, the gas hydrate-related program was reduced, and we focused on a set of experiments at Site U1517 in the creeping part of the TLC. We conducted a successful LWD and coring program to 205 mbsf, the latter with almost complete recovery, through the TLC and gas hydrate stability zone, followed by temperature and pressure tool deployments. AU - Pecher, I.A., Barnes, P.M., LeVay, L.J., and the Expedition 372 Scientists CY - College Station, TX, United States J2 - Affiliation (analytic): University of Auckland, School of Environmental and Marine Sciences, Auckland Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 372 Scientists, College Station, TX Coordinates: S385000 S385000 E1782900 E1782900; S385200 S385200 E1785400 E1785400; S384400 S384400 E1783700 E1783700; S385800 S385800 E1790800 E1790800 Contains 64 references Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Report - International Ocean Discovery Program, Vol.372, 35p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. GeoRef ID: 2018028000 URL access: Open access DOI: 10.14379/iodp.pr.372.2018 KW - Australasia Boreholes Cores Creep Dissociation Downhole methods Faults Gas hydrates Geophysical methods Geophysical profiles Geophysical surveys Hikurangi Margin IODP Site U1517 IODP Site U1518 IODP Site U1519 IODP Site U1520 International Ocean Discovery Program Marine sediments Mass movements Measurement-while-drilling New Zealand North Island Overpressure Pacific Ocean Physical properties Sediments Seismic methods Seismic profiles Slumping South Pacific Southwest Pacific Subduction zones Surveys Well logs West Pacific 07 Marine Geology and Oceanography 20 Geophysics, Applied LA - English PY - 2018 SN - 2372-9562 ; ST - Expedition 372 Preliminary Report: Creeping Gas Hydrate Slides and Hikurangi LWD TI - Expedition 372 Preliminary Report: Creeping Gas Hydrate Slides and Hikurangi LWD UR - https://doi.org/10.14379/iodp.pr.372.2018 ID - 5464 ER - TY - CPAPER AU - Pecher, I.A., Oluwunmi, P., Djeffal, A., Bangs, N.L., Crutchley, G.J., Mountjoy, J.J., Villinger, H.W., Barnes, P., Heeschen, K.U., Dugan, B., Reagan, M.T., Moridis, G.J., Archer, R., Saffer, D.M., Wallace, L.M., LeVay, L.J., and Petronotis, K.E. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Response of gas hydrate systems to subduction-zone processes on the northern Hikurangi margin, New Zealand UR - https://abstractsearch.agu.org/meetings/2018/FM/T54C-08.html ID - 14722 ER - TY - BOOK AU - Pecher, I.A., Barnes, P.M., LeVay, L.J., and the Expedition 372A Scientists CY - College Station, TX J2 - Affiliation (analytic): University of Auckland, School of Environmental and Marine Sciences, Auckland Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 372A Scientists, College Station, TX Coordinates: S384947 S384947 E1782834 E1782834 Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.372A. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2019046807 DOI: 10.14379/iodp.proc.372A.2019 KW - Australasia Biostratigraphy Boreholes Cenozoic Continental margin Cores Creep Expedition 372 Foraminifera Gas hydrates Geophysical methods Geophysical profiles Geophysical surveys Hikurangi Margin Holocene IODP Site U1517 International Ocean Discovery Program Lithostratigraphy Magnetostratigraphy Marine sediments Mass movements Microfossils Nannofossils New Zealand North Island Pacific Ocean Physical properties Pleistocene Quaternary Sediments Seismic methods Seismic profiles Seismic stratigraphy Slumping South Pacific Southwest Pacific Subduction zones Surveys Tuaheni Landslide Complex Well logs West Pacific 12 Stratigraphy, Historical Geology and Paleoecology 20 Geophysics, Applied LA - English PB - International Ocean Discovery Program PY - 2019 SN - 2377-3189 ; ST - Creeping Gas Hydrate Slides. Proceedings of the International Ocean Discovery Program TI - Creeping Gas Hydrate Slides. Proceedings of the International Ocean Discovery Program UR - https://doi.org/10.14379/iodp.proc.372A.2019 VL - 372A ID - 5469 ER - TY - CHAP A2 - Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., and the Expedition 341 Scientists AU - Penkrot, M. AU - Levay, L.J. AU - Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., and the Expedition 341 Scientists CY - College Station, TX PB - Integrated Ocean Drilling Program PY - 2017 ST - Data report: X-ray florescence scanning of sediment cores, Site U1419, Gulf of Alaska T2 - Proceedings of the Integrated Ocean Drilling Program TI - Data report: X-ray florescence scanning of sediment cores, Site U1419, Gulf of Alaska UR - https://doi.org/10.2204/iodp.proc.341.203.2017 VL - 341 ID - 9997 ER - TY - CPAPER AU - Penkrot, M.L., Jaeger, J.M., LeVay, L., St-Onge, G., Mix, A.C., Bahlburg, H., Davies-Walczak, M., and Gulick, S.P.S. CY - San Francisco, CA DA - 15–19 December 2014 N1 - Abstract PP21A-1285 PY - 2014 T2 - 2014 American Geophysical Union Fall Meeting TI - Northern Cordilleran ice sheet dynamics in coastal Alaska from MIS 3 to the Present: initial results UR - https://abstractsearch.agu.org/meetings/2014/FM/PP21A-1285.html ID - 15438 ER - TY - CPAPER AU - Penkrot, M.L., Jaeger, J.M., Cowan, E.A., Walczak, M.H., Mix, A.C., and LeVay, L., CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - American Geophysical Union Fall Meeting TI - Tectonic and climate influences on spatial and temporal variations of subglacial erosion; Bering Glacier, Alaska UR - https://abstractsearch.agu.org/meetings/2018/FM/C51E-1119.html ID - 49140 ER - TY - JOUR AB - Marine sediments preserve archives of glacier behavior from many proxies, with lithofacies analysis providing direct evidence of glacial extent and dynamics. Many of these lithofacies have corresponding physical and geochemical properties that may be identified through quantitative, nondestructive logging properties. This study applies supervised and unsupervised classification to downcore logging data to attempt to model temperate glacimarine facies, which are independently identified via visual lithofacies analysis based on core photographs, digital X-radiography, and computed tomography scans. We test the limits of these methods by modeling both broad glacial and interglacial and small-scale variations in Late Pleistocene (<60,000 yr) glacier extent leading into the Holocene deglaciation for a temperate ice stream at Integrated Ocean Drilling Program Site U1419 in the Gulf of Alaska. Multi-meter–scale mud and diamict lithofacies interpreted as non-glacial versus glacial conditions can be modeled with both methods using downcore physical property logging data (b* color reflectance, magnetic susceptibility, and natural gamma-ray activity) augmented with scanning X-ray fluorescence (XRF) elemental abundance (Ca, Zr, Si, K, Rb, and Al). Physical properties are most useful for delineating decimeter-meter–scale variations in composition and clay content, whereas scanning XRF elements best capture differences in sand versus clay content and composition at decimeter-centimeter scales. Neither classification technique can model the observed small-scale variations in diamict facies using elemental abundance from higher-resolution scanning XRF or from physical properties. Comparison of unsupervised cluster model results with observed lithofacies allows for identification of three different glacial conditions at Site U1419—ice-proximal, fluctuating, and retreating. For small-scale variations in glacial extent, cluster model results are best used as complementary data to image-based lithofacies identification rather than as a replacement. AU - Penkrot, Michelle L. AU - Jaeger, John M. AU - Cowan, Ellen A. AU - St-Onge, Guillaume AU - LeVay, Leah DO - 10.1130/ges01635.1 IS - 4 PY - 2018 SN - 1553-040X SP - 1935–1960 ST - Multivariate modeling of glacimarine lithostratigraphy combining scanning XRF, multisensory core properties, and CT imagery: IODP Site U1419 T2 - Geosphere TI - Multivariate modeling of glacimarine lithostratigraphy combining scanning XRF, multisensory core properties, and CT imagery: IODP Site U1419 UR - https://doi.org/10.1130/GES01635.1 VL - 14 Y2 - 3/2/2021 ID - 10008 ER - TY - JOUR AB - Abstract As a high-nutrient and low-chlorophyll region, the modern Gulf of Alaska (GoA) is strongly impacted by the limitation of iron. Paleostudies along the Alaskan slope have mainly focused on reconstructing environmental conditions over the past 18 ka. Based on micropaleontological, biogeochemical, and sedimentological parameters, we explore a sediment record covering the past 54 ka at Integrated Ocean Drilling Program Site U1419 to understand the impact of orbital- and suborbital-scale climate variability on productivity and sea-surface conditions. Close to the Cordilleran Ice Sheet (CIS), Site U1419 is ideally located to elucidate how the evolution of a large ice mass and glacial processes affected orbital- and suborbital-scale changes in nutrients (e.g., iron) supply. Meltwater discharge from the northern CIS impacted sea surface dynamics of GoA coastal waters. The corresponding increases in bulk biogenic concentrations during Marine Isotope Stage (MIS) 3 and MIS 2 (54–17 ka) suggests a direct impact from iron fertilization. The lack of a consistent relationship between productivity and SST suggests that cooling of surface waters was not the dominant control on primary producers. The inundation of the subaerially exposed continental shelf during the last deglacial (17–10 ka) warming could have served as a major micronutrient source, accounting for a deglacial peak in production. Low productivity after the last deglaciation suggests reduced iron availability, which we link to reduced meltwater inputs from smaller ice masses onshore. Our multiproxy approach reveals a more comprehensive picture of late Quaternary productivity variations compared to earlier studies along the Alaskan margin. The impact of tidewater glaciers and meltwater discharge on past marine productivity and nutrient budget dynamics of high-latitude coastal regions is discussed. AU - Romero, Oscar E. AU - LeVay, Leah J. AU - McClymont, Erin L. AU - Müller, Juliane AU - Cowan, Ellen A. DO - https://doi.org/10.1029/2021PA004385 IS - 1 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021PA004385 PY - 2022 SN - 2572-4517 SP - e2021PA004385 ST - Orbital and suborbital-scale variations of productivity and sea surface conditions in the Gulf of Alaska during the past 54,000 years: impact of iron fertilization by icebergs and meltwater T2 - Paleoceanography and Paleoclimatology TI - Orbital and suborbital-scale variations of productivity and sea surface conditions in the Gulf of Alaska during the past 54,000 years: impact of iron fertilization by icebergs and meltwater UR - https://doi.org/10.1029/2021PA004385 VL - 37 ID - 22408 ER - TY - CPAPER AU - Saffer, D.M., Bell, R.E., Barnes, P., Wallace, L.M., Kitajima, H., Moore, G.F., Han, S., Pecher, I.A., Petronotis, K.E., and LeVay, L. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Elastic moduli and physical properties of fault rock and protolith associated with SSEs at the northern Hikurangi margin, NZ UR - https://abstractsearch.agu.org/meetings/2018/FM/T54C-04.html ID - 14724 ER - TY - CPAPER AU - Sagar, N., LeVay, L., Naik, D., Peketi, A., and the Expedition 353 Scientific Party CY - Goa, India DA - 3–5 November 2015 PY - 2015 T2 - 2015 Indian Geophysical Union (IGU) Annual Convention TI - International Ocean Discovery Program (IODP) Expedition 353: Indian Monsoon Rainfall ID - 15965 ER - TY - CPAPER AU - Savage, H.M., Coffey, G.L., Shreedharan, S., Polissar, P.J., Fagereng, A., Meneghini, F., Morgan, J., Wang, M., Hashimoto, Y., Wallace, L.M., Saffer, D.M., Barnes, P., Pecher, I.A., Petronotis, K.E., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Signatures of brittle deformation in a shallow fault in the Hikurangi subduction margin UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0303.html ID - 14725 ER - TY - JOUR AB - Abstract Quantifying fault damage zones provides a window into stress distribution and rheology around faults. International Ocean Discovery Program (IODP) Expeditions 372/375 drilled an active thrust splay fault within the Hikurangi subduction margin. The fault, which is hosted in Pleistocene clastic sediments, is surrounded by brittle fractures and faults as well as ductile deformation features. We find that fracture density in the damage zone enveloping the fault is asymmetric, with the hanging wall showing greater overall fracture density and at greater distances from the fault than the footwall. Furthermore, the peak in fracture density occurs within an area of mesoscale folding and localized slip in the hanging wall rather than adjacent to the main fault zone. We attribute the asymmetry in damage to disparate deformation histories between the hanging wall and footwall, greater ductile deformation within the footwall, and/or dynamic stress asymmetry around a propagating rupture. Damage asymmetry is common at shallow depths in subduction zones and influences the mechanical and hydrological properties of the fault, such as channelized fluid flow and fault stability. Finally, we demonstrate that subduction zone faults show similar damage-displacement scaling as continental faults. AU - Savage, Heather M. AU - Shreedharan, Srisharan AU - Fagereng, Åke AU - Morgan, Julia K. AU - Meneghini, Francesca AU - Wang, Maomao AU - McNamara, David D. AU - Wallace, Laura M. AU - Saffer, Demian M. AU - Barnes, Philip M. AU - Petronotis, Katerina E. AU - LeVay, Leah J. DO - https://doi.org/10.1029/2021GC009662 IS - 8 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021GC009662 PY - 2021 SN - 1525-2027 SP - e2021GC009662 ST - Asymmetric brittle deformation at the Pāpaku fault, Hikurangi Subduction Margin, NZ, IODP Expedition 375 T2 - Geochemistry, Geophysics, Geosystems TI - Asymmetric brittle deformation at the Pāpaku fault, Hikurangi Subduction Margin, NZ, IODP Expedition 375 UR - https://doi.org/10.1029/2021GC009662 VL - 22 ID - 16967 ER - TY - JOUR AU - Schneider, L.J., Allen, J.A., Frank, T.D., and Bralower, T.J. IS - 7 PY - 2006 SP - 491 ST - Cretaceous-Paleocene calcite compensation depth fluctuations in the Atlantic and Pacific oceans T2 - Geological Society of America Abstracts with Programs TI - Cretaceous-Paleocene calcite compensation depth fluctuations in the Atlantic and Pacific oceans VL - 38 ID - 49134 ER - TY - CPAPER AU - Schneider, L.J., Watkins, D.K., and Frank, T.D. CY - Lincoln, NE PY - 2006 T2 - International Nannoplankton Association Conference TI - Differential interoceanic surface water cooling during the late Campanian as indicated by calcareous nannofossil assemblage changes ID - 49135 ER - TY - JOUR AU - Schneider, L.J., and Bralower, T.J. IS - 52 PY - 2007 SP - PP41B-0545 ST - Experimental dissolution of fine-fraction carbonate sediments from the Paleocene T2 - Eos, Transactions of the American Geophysical Union TI - Experimental dissolution of fine-fraction carbonate sediments from the Paleocene UR - https://abstractsearch.agu.org/meetings/2007/FM/PP41B-0545.html VL - 88 ID - 49133 ER - TY - JOUR AU - Schneider, L.J., Bralower, T.J., Kump, L.R., and Hilting, A.K. IS - 53 PY - 2008 SP - PP33B-1551 ST - The paleoecology of Eocene nannoplankton and global oceanographic variability during the early-middle Eocene T2 - Eos, Transactions of the American Geophysical Union TI - The paleoecology of Eocene nannoplankton and global oceanographic variability during the early-middle Eocene UR - https://abstractsearch.agu.org/meetings/2008/FM/PP33B-1551.html VL - 89 ID - 49132 ER - TY - JOUR AU - Schneider, L.J., Bralower, T.J., Kump, L.R., Hilting, A.K, and Sessa, J.A. PY - 2009 ST - The paleoecology of Eocene nannoplankton and global oceanographic variability during the early-middle Eocene T2 - The Climatic and Biotic Events of the Paleogene Abstracts TI - The paleoecology of Eocene nannoplankton and global oceanographic variability during the early-middle Eocene ID - 49131 ER - TY - CPAPER AU - Schneider, L.J., Bralower, T.J., and Kump, L.R. CY - La Jolla, CA PY - 2010 T2 - International Conference on Paleoceanography TI - Global Eocene nannofossil paleoecology and the response to early Eocene ocean destratification ID - 49129 ER - TY - CPAPER AU - Schneider, L.J., Bralower, T.J., Patzkowsky, M.E., and Kump, L.R. CY - San Francisco, CA DA - 3–7 December 2012 PY - 2012 T2 - American Geophysical Union Fall Meeting TI - Global nannoplankton dynamics across the Paleocene-Eocene Thermal Maximum: A statistical approach UR - https://abstractsearch.agu.org/meetings/2012/FM/PP31B-2019.html ID - 49128 ER - TY - CPAPER AU - Schneider, L.J., Bralower, T.J., Kump, L.R., Holbourn, A., and Romero, O.E. CY - Houston, TX DA - 10–13 March 2013 PY - 2013 T2 - Geological Problem Solving with Microfossils III TI - Enhanced calcareous nannoplankton productivity during the middle Miocene transition in the eastern equatorial Pacific (IODP Site U1338) ID - 49127 ER - TY - JOUR AB - Nannoplankton play a significant role in the global carbon cycle; changes in the composition of the assemblage can influence primary productivity, carbon burial, and ultimately climate. Here counts of nannofossils in Eocene samples document one of the largest nannoplankton assemblage turnovers of the Cenozoic Era. This event is marked by the global expansion of Reticulofenestra at the termination of the early Eocene climatic optimum (EECO), and continues through the progressive cooling to the earliest Oligocene glaciation. To understand the mechanisms driving this assemblage shift we use multivariate statistical techniques and carbon and oxygen isotope records from localities worldwide. We find that the turnover in the global nannofossil assemblage is tied to thermal destratification of the ocean and a coincident decrease in the efficiency of the oceanic biologic pump at the height of the EECO. We propose that increased vertical mixing and increased nutrient supply to surface waters during the EECO caused a shift in the trophic structure towards enhanced productivity, influencing the global nannoplankton population. Abstract Copyright (2011) Elsevier, B.V. AU - Schneider, Leah J. AU - Bralower, Timothy J. AU - Kump, Lee R. IS - 3 J2 - Affiliation (analytic): Pennsylvania State University at University Park, University Park, PA Affiliation (monographic): Pennsylvania State University at University Park, University Park, PA, United States Coordinates: N321300 N321300 E1581600 E1581600; S195315 S195314 E1121515 E1121514; S565000 S565000 E0680536 E0680536; S643101 S643100 E0030600 E0030559 illus., incl. sketch map Contains 76 references Research Program: DSDP Deep Sea Drilling Project; IPOD International Phase of Ocean Drilling; ODP Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Palaeogeography, Palaeoclimatology, Palaeoecology, 310(3-4), p.152-162. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands GeoRef ID: 2017006491 DOI: 10.1016/j.palaeo.2011.06.018 KW - Algae Arctic environment Assemblages Atlantic Ocean Biologic evolution Biostratigraphy C-13/C-12 Carbon Carbon cycle Cenozoic DSDP Site 549 Deep Sea Drilling Project Early Eocene Climatic Optimum Eocene Exmouth Plateau Geochemical cycle IPOD Indian Ocean Isotope ratios Isotopes Kerguelen Plateau Leg 113 Leg 122 Leg 183 Leg 198 Leg 208 Leg 80 Lower Eocene Maud Rise Microfossils Multivariate analysis Nannofossils Nannoplankton North Atlantic North Pacific Northwest Pacific O-18/O-16 ODP Site 1135 ODP Site 1137 ODP Site 1210 ODP Site 1263 ODP Site 689 ODP Site 690 ODP Site 762 Ocean Drilling Program Oxygen Pacific Ocean Paleo-oceanography Paleoecology Paleogene Plankton Plantae Reticulofenestra Shatsky Rise South Atlantic Southern Ocean Stable isotopes Statistical analysis Temperate environment Tertiary Trophic analysis Tropical environment Walvis Ridge Weddell Sea West Pacific 02 Geochemistry 12 Stratigraphy, Historical Geology and Paleoecology LA - English PY - 2011 SN - 0031-0182 SP - 152–162 ST - Response of nannoplankton to early Eocene ocean destratification T2 - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Response of nannoplankton to early Eocene ocean destratification UR - https://doi.org/10.1016/j.palaeo.2011.06.018 VL - 310 ID - 4115 ER - TY - JOUR AB - The Paleocene-Eocene Thermal Maximum (PETM; ca. 55.8 Ma) is thought to coincide with a profound but entirely transient change among nannoplankton communities throughout the ocean. Here we explore the ecology of nannoplankton during the PETM by using multivariate analyses of a global data set that is based upon the distribution of taxa in time and space. We use these results, coupled with stable isotope data and geochemical modeling, to reinterpret the ecology of key genera. The results of the multivariate analyses suggest that the community was perturbed significantly in coastal and high-latitudes sites compared to the open ocean, and the relative influence of temperature and nutrient availability on the assemblage varies regionally. The open ocean became more stratified and less productive during the PETM and the oligotrophic assemblage responded primarily to changes in nutrient availability. Alternatively, assemblages at the equator and in the Southern Ocean responded to temperature more than to nutrient reduction. In addition, the assemblage change at the PETM was not merely transient—there is evidence of adaptation and a long-term change in the nannoplankton community that persists after the PETM and results in the disappearance of a high-latitude assemblage. The long-term effect on communities caused by transient warming during the PETM has implications for modern-day climate change, suggesting similar permanent changes to nannoplankton community structure as the oceans warm. AU - Schneider, Leah J. AU - Bralower, Timothy J. AU - Kump, Lee R. AU - Patzkowsky, Mark E. IS - 4 PY - 2013 SP - 628–647 ST - Calcareous nannoplankton ecology and community change across the Paleocene-Eocene Thermal Maximum T2 - Paleobiology TI - Calcareous nannoplankton ecology and community change across the Paleocene-Eocene Thermal Maximum UR - https://doi.org/10.1666/12050 VL - 39 ID - 49125 ER - TY - JOUR AB - Global climate during the Neogene is distinguished by the transition into a colder, more variable world dominated by the onset and intensification of major Northern Hemisphere glaciations. This transition to the icehouse world corresponds with a global increase in erosion rates and sediment delivery to basins. The effects of this increased erosion may be profound, as worldwide analyses of orogenic belts have shown that Earth systems cannot be considered to be the product of a series of distinct, decoupled tectonic and climatic processes. Rather, there is complex interplay between deformation, exhumation, and climate systems. Exhumation plays a key role in controlling the regional distribution of metamorphic rocks, local climate change, and development of structures throughout an orogen. As tectonic processes influence regional climate by raising mountains that enhance orographic precipitation patterns and intensity, the Neogene climate transition, in turn, likely affected tectonic processes through changes in erosion rates, which redistributed mass and subsequently altered stresses in orogenic wedges. Analytical models examining the coupling between glacial erosion and orogenic processes reveal that glacial erosion can significantly modify the patterns and rates of erosion in an orogenic wedge. A critical question is at what stage of the deteriorating Neogene climate is an orogen ultimately driven into subcriticality? Does this state lead to increased exhumation in the glaciated core of a mountain belt, enhanced topographic relief, and migration of the locus of sediment accumulation to the toes of an orogen that impacts deformation patterns? Addressing the linkages between global climate change, modification of the dynamics of surficial processes, and subsequent tectonic responses requires integrated studies of orogenic systems in areas that exemplify specific end-members of the problem. The Gulf of Alaska borders the St. Elias orogen of Alaska and Canada, the highest coastal mountain range on Earth and the highest range in North America. This orogen is <30 Ma in age, and mountain building occurred during a period of significant global climate change, allowing Integrated Ocean Drilling Program Expedition 341 to examine the response of an orogenic system to the establishment of a highly erosive glacial system. Additionally, the implications of Neogene glacial growth in the circum-North Pacific are far reaching, beyond a tectonic response to increased glacial erosion and exhumation. As climate determines the timing and patterns of precipitation, it controls glacial dynamics, erosion, and sediment/meltwater and chemical fluxes to the ocean. Establishing the timing of northwestern Cordilleran ice sheet advance-retreat cycles in southern Alaska will address a major challenge in Neogene paleoclimatology, which is to determine the extent to which glacial-age climate change was a synchronous worldwide event and what the driving mechanisms were for potentially propagating millennial-scale warming-cooling cycles around the globe. Evidence of substantial changes in surface productivity in the Gulf of Alaska since the Last Glacial Maximum indicates that millennial-scale climate change and eustasy in the northeast Pacific Ocean has a first-order effect on primary productivity. AU - Scientists, Expedition 341 J2 - Affiliation (analytic): University of Florida, Department of Geological Sciences, Gainesville, FL Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 341 Scientists, College Station, TX Coordinates: N565800 N565800 W1470700 E1470700; N584700 N584700 W1443000 W1443000; N593200 N593200 W1440800 W1440800; N594100 N594100 W1431200 W1431200; N593000 N593000 W1440300 W1440300 Contains 210 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Preliminary Report (Integrated Ocean Drilling Program), Vol.341, 192p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2014053715 DOI: 10.2204/iodp.pr.341.2014 KW - Alaska Algae Biostratigraphy Boreholes Cenozoic Clastic sediments Climate change Continental margin Cores Depositional environment Diamicton Diatoms East Pacific Erosion Exhumation Expedition 341 Foraminifera Geophysical methods Geophysical profiles Geophysical surveys Glaciation Gulf of Alaska IODP Site U1417 IODP Site U1418 IODP Site U1419 IODP Site U1420 IODP Site U1421 Integrated Ocean Drilling Program Invertebrata Lithofacies Lithostratigraphy Magnetostratigraphy Marine sediments Microfossils Neogene North Pacific Northeast Pacific Orogenic belts Orogeny Pacific Ocean Paleo-oceanography Paleoclimatology Paleomagnetism Plantae Productivity Protista Quaternary Radiolaria Sedimentary rocks Sedimentation Sediments Seismic methods Seismic profiles Seismic stratigraphy Southern Alaska Surveys Tectonics Tertiary United States Volcaniclastics Well logs 12 Stratigraphy, Historical Geology and Paleoecology LA - English N1 - Jaeger, J.M., Gulick, S.P.S., LeVay, L.J., Asahi, H., Bahlburg, H., Belanger, C.L., Berbel, G.B.B., Childress, L.B., Cowan, E.A., Drab, L., Forwick, M., Fukumura, A., Ge, S., Gupta, S.M., Kioka, A., Konno, S., März, C.E., Matsuzaki, K.M., McClymont, E.L., Mix, A.C., Moy, C.M., Müller, J., Nakamura, A., Ojima, T., Ridgway, K.D., Rodrigues Ribeiro, F., Romero, O.E., Slagle, A.L., Stoner, J.S., St-Onge, G., Suto, I., Walczak, M.H., and Worthington, L.L. PY - 2014 SN - 1932-9423 ; ST - Southern Alaska margin: interactions of tectonics, climate, and sedimentation T2 - Integrated Ocean Drilling Program Preliminary Report TI - Southern Alaska margin: interactions of tectonics, climate, and sedimentation UR - https://doi.org/10.2204/iodp.pr.341.2014 VL - 341 ID - 4782 ER - TY - CPAPER AU - Screaton, E., Torres, M.E., Dugan, B., Heeschen, K.U., Mountjoy, J.J., Oware, S., Rose, P.S., Pecher, I.A., Barnes, P.M., LeVay, L.J., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Impact of sea-level and bottom water temperature change on methane-hydrate stability: IODP Site U1517, Hikurangi margin UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0312.html ID - 14726 ER - TY - JOUR AB - Dissolved chloride concentrations higher than seawater were observed over a broad depth range in pore water profiles from International Ocean Discovery Program Site U1517 on the Hikurangi Margin. This Cl maximum is not associated with an 87Sr/86Sr anomaly, indicating that it is not caused by hydration reactions during ash alteration. We use a numerical modeling approach to examine possible causes for recent gas hydrate formation that can result in the observed Cl high. Our approach considers sedimentation, sea level, and bottom water temperature (BWT) changes due to glaciation as drivers for the downward migration of the base of gas hydrate stability and gas hydrate formation. The modeling results reveal that lowering of sea level during glaciation can allow methane hydrate dissociation followed by postglacial hydrate formation as sea level rises. However, BWT cooling of 2 °C during glaciation followed by warming during deglaciation would mostly counteract the impacts of sea level change. Bottom water cooling during glaciation is expected in this region and many locations worldwide. As a result, our simulations do not support the previous hypotheses of large-scale gas hydrate dissociation due to sea level drop during glaciation, which have been proposed as triggers for widespread gas release and slope failure. Such a mechanism is only possible where BWT remains constant or increases during glaciation. Our simulations indicate that sedimentation constitutes the largest factor driving recent methane hydrate formation at Site U1517, and we suggest that sedimentation may play a larger role in gas hydrate dynamics along margins than previously recognized. Abstract Copyright (2019), American Geophysical Union. All Rights Reserved. AU - Screaton, E. J. AU - Torres, M. E. AU - Dugan, B. AU - Heeschen, K. U. AU - Mountjoy, J. J. AU - Ayres, C. AU - Rose, P. S. AU - Pecher, I. A. AU - Barnes, P. M. AU - LeVay, L. J. IS - 11 J2 - Affiliation (analytic): University of Florida, Department of Geological Sciences, Gainesville, FL Affiliation (monographic): University of Florida, Department of Geological Sciences, Gainesville, FL, United States Coordinates: S385100 S384500 E1783200 E1782500 illus., incl. sketch map Contains 70 references Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Geochemistry, Geophysics, Geosystems - G>3`, 20(11), p.4906-4921. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union GeoRef ID: 2020034087 DOI: 10.1029/2019GC008603 KW - Aliphatic hydrocarbons Alkaline earth metals Alkanes Bottom water Chloride ion Chlorine Data processing Digital simulation Dynamics Expedition 372 Expeditions 372/375 Gas hydrates Geophysical methods Geophysical profiles Geophysical surveys Glacial environment Glaciation Halogens Hikurangi Margin Hydrocarbons IODP Site U1517 Interglacial environment International Ocean Discovery Program Isotope ratios Isotopes Metals Methane Ocean floors Organic compounds Pacific Ocean Pore water Sea-level changes Sedimentation Sedimentation rates Seismic methods Seismic profiles South Pacific Southwest Pacific Sr-87/Sr-86 Stability Stable isotopes Strontium Surveys West Pacific 02 Geochemistry 06 Petrology, Sedimentary LA - English PY - 2019 SN - 1525-2027 SP - 4906–4921 ST - Sedimentation controls on methane-hydrate dynamics across glacial/interglacial stages: an example from International Ocean Discovery Program Site U1517, Hikurangi Margin T2 - Geochemistry, Geophysics, Geosystems TI - Sedimentation controls on methane-hydrate dynamics across glacial/interglacial stages: an example from International Ocean Discovery Program Site U1517, Hikurangi Margin UR - https://doi.org/10.1029/2019GC008603 VL - 20 ID - 5471 ER - TY - JOUR AB - Abstract Screaton et al. (2019, https://doi.org/10.1029/2019GC008603) examined the role of sedimentation, sea level, and bottom water temperature (BWT) changes due to glaciation as drivers for the downward migration of the base of gas hydrate stability and gas hydrate formation. International Ocean Discovery Program (IODP) Site U1517 in the Hikurangi margin was used as a case study because data at this site document a marked increase in chloride over a broad depth range, which was attributed to recent gas hydrate formation. In a comment on Screaton et al. (2019, https://doi.org/10.1029/2019GC008603), Sultan (2020, https://doi.org/10.1029/2019gc008846) used a linear thermal profile to argue that inferences and characterization of methane hydrate at IODP Site U1517 were incorrect because some occur below his estimated base of gas hydrate stability (BGHS). Based on this apparent discrepancy, Sultan (2020, https://doi.org/10.1029/2019gc008846) further stated that low-chloride spikes may be unreliable indicators of methane hydrate occurrence. In this reply, we emphasize that unsteady-state, and thus nonlinear, thermal profiles are likely in areas experiencing active sedimentation and bottom-water temperature (BWT) changes. The resulting deviation from steady-state temperature profile shifts the BGHS downward. In addition, sedimentation has the potential to bury methane hydrate more rapidly than it dissociates, helping to explain how methane hydrate could be observed below the BGHS. We also review the supporting evidence for gas-hydrate occurrence at Site U1517 and the criteria used for Site U1517 site selection. AU - Screaton, E. J. AU - Torres, M. E. AU - Dugan, B. AU - Heeschen, K. U. AU - Mountjoy, J. J. AU - Ayres, C. AU - Rose, P. S. AU - Pecher, I. A. AU - Barnes, P. M. AU - LeVay, L. J. DO - https://doi.org/10.1029/2020GC009005 IS - 6 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020GC009005 PY - 2020 SN - 1525-2027 SP - e2020GC009005 ST - Reply to comments by N. Sultan on “Sedimentation controls on methane-hydrate dynamics across glacial/interglacial stages: an example from International Ocean Discovery Program Site U1517, Hikurangi Margin” T2 - Geochemistry, Geophysics, Geosystems TI - Reply to comments by N. Sultan on “Sedimentation controls on methane-hydrate dynamics across glacial/interglacial stages: an example from International Ocean Discovery Program Site U1517, Hikurangi Margin” UR - https://doi.org/10.1029/2020GC009005 VL - 21 ID - 10680 ER - TY - CPAPER AU - Sluijs, A., Bijl, P., Stap, L., van Roij, L., Bohaty, S.M., Brinkhuis, H., Harrington, G.J., Lourens, L.J., Reichart, G., Röhl, U., Schneider, L.J., Sessa, J., Thomas, E., Schouten, S., and Zachos, J.C. CY - San Francisco, CA DA - 13–17 December 2010 PY - 2010 T2 - American Geophysical Union Fall Meeting TI - Temperature and carbon isotope histories for early Eocene hyperthermals: events linked by a similar causal mechanism? UR - https://abstractsearch.agu.org/meetings/2010/FM/PP21E-03.html ID - 49143 ER - TY - JOUR AU - Sluijs, A. AU - van Roij, L. AU - Harrington, G. J. AU - Schouten, S. AU - Sessa, J. A. AU - LeVay, L. J. AU - Reichart, G. J. AU - Slomp, C. P. DO - 10.5194/cp-10-1421-2014 IS - 4 N1 - https://cp.copernicus.org/articles/10/1421/2014/ PY - 2014 SN - 1814-9332 SP - 1421–1439 ST - Warming, euxinia and sea level rise during the Paleocene–Eocene Thermal Maximum on the Gulf Coastal Plain: implications for ocean oxygenation and nutrient cycling T2 - Climate of the Past TI - Warming, euxinia and sea level rise during the Paleocene–Eocene Thermal Maximum on the Gulf Coastal Plain: implications for ocean oxygenation and nutrient cycling UR - https://doi.org/10.5194/cp-10-1421-2014 VL - 10 ID - 49124 ER - TY - CPAPER AU - Solomon, E.A., Huepers, A., Luo, M., Malie, P.R., Saffer, D.M., Torres, M.E., Wallace, L.M., Petronotis, K.E., Barnes, P., Pecher, I.A., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Geochemical constraints on fluid-rock reactions, fluid sources, and flow pathways along the IODP Expedition 375 transect; northern Hikurangi margin UR - https://abstractsearch.agu.org/meetings/2018/FM/T54C-07.html ID - 14727 ER - TY - CPAPER AB - Palaeoceanographic evidence suggests that glacial periods of the Mid to Late Pleistocene were characterized by markedly different global ocean circulation patterns to modern; in the Atlantic basin, deep waters of Southern Ocean origin increased in volume while above them the core of the North Atlantic Deep Water (NADW) shoaled. Whilst proxy records and modelling efforts continue to clarify this picture, an evidence alluding to the origin of this phenomenon remains elusive. Because of this, our understanding of the sequence of events leading to global glacial conditions remains incomplete. Here we present multi-proxy evidence showing that northward shifts in Antarctic iceberg melt in the Indian–Atlantic Southern Ocean (0–50°E) systematically preceded deep-water mass reorganizations by 1-2 thousand years during Pleistocene-era glaciations. With the aid of iceberg-trajectory model experiments, we demonstrate that such a shift in iceberg trajectories during glacial periods can result in a considerable redistribution of freshwater in the Southern Ocean. This, in concert with increased sea-ice cover, may have enabled positive buoyancy anomalies to effectively escape into the ‘upper’ Atlantic overturning circulation limb, providing a teleconnection between surface Southern Ocean conditions and the formation of NADW. Furthermore, we observe a distinct obliquity pacing of Antarctic iceberg melt both preceding and following the Mid-Pleistocene Transition, become obscured during this interval. With new and existing data we investigate the evolution of orbital forcing at the Agulhas Plateau, considering the implications for ‘Southern Escape’ of freshwater as a key feedback in the transition to the ‘100-kyr world’. AU - Starr, A., Hall, I.R., Barker, S., Hemming, S.R., Rackow, T., Zhang, X., van der Lubbe, J., Knorr, G., Berke, M.A., Bigg, G.R., Cartagena-Sierra, A., Jimenez-Espejo, F.J., Gong, X., Gruetzner, J., Lathika, N., LeVay, L.J., and Ziegler, M. DA - 4–9 July 2021 PY - 2021 T2 - Goldschmidt Virtual 2021 TI - The interglacial-glacial sequence of events at the Agulhas Plateau: Antarctic icebergs lead ocean circulation into ice ages and across the Mid-Pleistocene Transition UR - https://epic.awi.de/id/eprint/54610/ ID - 23168 ER - TY - JOUR AB - The dominant feature of large-scale mass transfer in the modern ocean is the Atlantic meridional overturning circulation (AMOC). The geometry and vigour of this circulation influences global climate on various timescales. Palaeoceanographic evidence suggests that during glacial periods of the past 1.5 million years the AMOC had markedly different features from today1; in the Atlantic basin, deep waters of Southern Ocean origin increased in volume while above them the core of the North Atlantic Deep Water (NADW) shoaled2. An absence of evidence on the origin of this phenomenon means that the sequence of events leading to global glacial conditions remains unclear. Here we present multi-proxy evidence showing that northward shifts in Antarctic iceberg melt in the Indian–Atlantic Southern Ocean (0–50° E) systematically preceded deep-water mass reorganizations by one to two thousand years during Pleistocene-era glaciations. With the aid of iceberg-trajectory model experiments, we demonstrate that such a shift in iceberg trajectories during glacial periods can result in a considerable redistribution of freshwater in the Southern Ocean. We suggest that this, in concert with increased sea-ice cover, enabled positive buoyancy anomalies to ‘escape’ into the upper limb of the AMOC, providing a teleconnection between surface Southern Ocean conditions and the formation of NADW. The magnitude and pacing of this mechanism evolved substantially across the mid-Pleistocene transition, and the coeval increase in magnitude of the ‘southern escape’ and deep circulation perturbations implicate this mechanism as a key feedback in the transition to the ‘100-kyr world’, in which glacial–interglacial cycles occur at roughly 100,000-year periods. AU - Starr, Aidan AU - Hall, Ian R. AU - Barker, Stephen AU - Rackow, Thomas AU - Zhang, Xu AU - Hemming, Sidney R. AU - van der Lubbe, H. J. L. AU - Knorr, Gregor AU - Berke, Melissa A. AU - Bigg, Grant R. AU - Cartagena-Sierra, Alejandra AU - Jiménez-Espejo, Francisco J. AU - Gong, Xun AU - Gruetzner, Jens AU - Lathika, Nambiyathodi AU - LeVay, Leah J. AU - Robinson, Rebecca S. AU - Ziegler, Martin AU - Brentegani, Luna AU - Caley, Thibaut AU - Charles, Christopher D. AU - Coenen, Jason J. AU - Crespin, Julien G. AU - Franzese, Allison M. AU - Han, Xibin AU - Hines, Sophia K. V. AU - Jimenez Espejo, Francisco J. AU - Just, Janna AU - Koutsodendris, Andreas AU - Kubota, Kaoru AU - Norris, Richard D. AU - dos Santos, Thiago Pereira AU - Rolison, John M. AU - Simon, Margit H. AU - Tangunan, Deborah AU - van der Lubbe, H. J. L. AU - Yamane, Masako AU - Zhang, Hucai AU - the Expedition 361 Science Party DA - 2021/01/01 DO - 10.1038/s41586-020-03094-7 IS - 7841 PY - 2021 SN - 1476-4687 SP - 236–241 ST - Antarctic icebergs reorganize ocean circulation during Pleistocene glacials T2 - Nature TI - Antarctic icebergs reorganize ocean circulation during Pleistocene glacials UR - https://doi.org/10.1038/s41586-020-03094-7 VL - 589 ID - 8929 ER - TY - JOUR AB - In the southern Indian Ocean, the position of the subtropical front – the boundary between colder, fresher waters to the south and warmer, saltier waters to the north – has a strong influence on the upper ocean hydrodynamics and biogeochemistry. Here we analyse a sedimentary record from the Agulhas Plateau, located close to the modern position of the subtropical front and use alkenones and coccolith assemblages to reconstruct oceanographic conditions over the past 300,000 years. We identify a strong glacial-interglacial variability in sea surface temperature and productivity associated with subtropical front migration over the Agulhas Plateau, as well as shorter-term high frequency variability aligned with variations in high latitude insolation. Alkenone and coccolith abundances, in combination with diatom and organic carbon records indicate high glacial export productivity. We conclude that the biological pump was more efficient and strengthened during glacial periods, which could partly account for the reported reduction in atmospheric carbon dioxide concentrations. AU - Tangunan, Deborah AU - Berke, Melissa A. AU - Cartagena-Sierra, Alejandra AU - Flores, José Abel AU - Gruetzner, Jens AU - Jiménez-Espejo, Francisco AU - LeVay, Leah J. AU - Baumann, Karl-Heinz AU - Romero, Oscar AU - Saavedra-Pellitero, Mariem AU - Coenen, Jason J. AU - Starr, Aidan AU - Hemming, Sidney R. AU - Hall, Ian R. AU - Barker, Stephen AU - Brentegani, Luna AU - Caley, Thibaut AU - Charles, Christopher D. AU - Crespin, Julien G. AU - Franzese, Allison M. AU - Han, Xibin AU - Hines, Sophia K. V. AU - Jimenez Espejo, Francisco J. AU - Just, Janna AU - Koutsodendris, Andreas AU - Kubota, Kaoru AU - Lathika, Nambiyathodi AU - Norris, Richard D. AU - dos Santos, Thiago Pereira AU - Robinson, Rebecca S. AU - Rolison, John M. AU - Simon, Margit H. AU - Tangunan, Deborah AU - van der Lubbe, Jeroen J. L. AU - Yamane, Masako AU - Zhang, Hucai AU - the Expedition 361 Science Party DA - 2021/05/05 DO - 10.1038/s43247-021-00148-0 IS - 1 PY - 2021 SN - 2662-4435 SP - 80 ST - Strong glacial-interglacial variability in upper ocean hydrodynamics, biogeochemistry, and productivity in the southern Indian Ocean T2 - Communications Earth & Environment TI - Strong glacial-interglacial variability in upper ocean hydrodynamics, biogeochemistry, and productivity in the southern Indian Ocean UR - https://doi.org/10.1038/s43247-021-00148-0 VL - 2 ID - 12790 ER - TY - JOUR AB - A detailed paleoenvironment reconstruction from the Mozambique Channel, western Indian Ocean, based on the calcareous nannoplankton assemblages was conducted for the interval between 2.85 and 1.85 Myr. This study covers the period during which the successive extinction of the last five species of discoasters occurred. New productivity data obtained from the abundances of the Discoaster species (Discoaster brouweri, D. triradiatus, D. pentaradiatus, D. surculus, and D. tamalis) and other indicative calcareous nannoplankton taxa showed abundance variations, which were at paced with the 100, 41, and 23 kyr astronomical periodicities. A shift in the productivity and water-column stratification proxies occurred at ~2.4 Ma, after the onset of the Northern Hemisphere glaciation. Here we propose that the variability recorded at International Ocean Discovery Program Site U1476 reflects the interplay between forcing associated with warm tropical Pacific and cold southern ocean influences. The former is shown by consistent occurrence of warm water taxa (Calcidiscus leptoporus, Oolithotus spp., Rhabdosphaera clavigera, Syracosphaera spp., Umbellosphaera spp.), typical of Indonesian Throughflow surface waters. On the other hand, the occurrence of Coccolithus pelagicus indicates the influence of cold, nutrient-rich sub-Antarctic surface waters. A more mixed water column initiated at ~2.4 Ma, and a consequent productivity increase led to the gradual reduction of the Discoaster species, until their extinction at 1.91 Ma. This period was characterized by the low values of the Florisphaera profunda index and high abundances of upper photic zone flora, indicative of nutrient-rich surface water conditions. High productivity at the location during this period could have also been amplified by localized upwelling events driven by the Mozambique Channel eddies. AU - Tangunan, Deborah N. AU - Baumann, Karl-Heinz AU - Just, Janna AU - LeVay, Leah J. AU - Barker, Stephen AU - Brentegani, Luna AU - De Vleeschouwer, David AU - Hall, Ian R. AU - Hemming, Sidney AU - Norris, Richard DA - 2018/09/15/ DO - https://doi.org/10.1016/j.palaeo.2018.05.043 KW - Calcareous nannofossils Nannoplankton Western Indian Ocean Expedition 361 N1 - http://www.sciencedirect.com/science/article/pii/S003101821830186X PY - 2018 SN - 0031-0182 SP - 187–197 ST - The last 1 million years of the extinct genus Discoaster: Plio–Pleistocene environment and productivity at Site U1476 (Mozambique Channel) T2 - Palaeogeography, Palaeoclimatology, Palaeoecology TI - The last 1 million years of the extinct genus Discoaster: Plio–Pleistocene environment and productivity at Site U1476 (Mozambique Channel) UR - https://doi.org/10.1016/j.palaeo.2018.05.043 VL - 505 ID - 7659 ER - TY - JOUR AU - Taylor, A.K., Berke, M.A., Castaneda, I.S., Hall, I.R., Hemming, S.R., and LeVay, L.J. DO - https://doi.org/10.1130/abs/2018AM-321613 IS - 6 PY - 2018 SP - 184 ST - Biomarker records of Plio-Pleistocene paleoclimate from the southeast African margin T2 - Geological Society of America Abstracts with Programs TI - Biomarker records of Plio-Pleistocene paleoclimate from the southeast African margin UR - https://doi.org/10.1130/abs/2018AM-321613 VL - 50 ID - 16191 ER - TY - JOUR AB - Abstract Efforts to understand long-term Indian Ocean dynamics and land-sea linkages in southeast Africa during periods of significant global and regional climate change have been inhibited by a lack of high-resolution climate records, particularly during the Plio-Pleistocene. Here we present new biomarker and pollen records from International Ocean Discovery Program (IODP) Site U1478, located at the Upper Agulhas Confluence near the Limpopo River mouth, to establish environmental conditions at the southeast African margin between 4 and 1.8 Ma and address this spatiotemporal gap. Compound-specific hydrogen isotopes of terrestrial leaf waxes (δDwax) and TEX86, using marine archaeal lipids, document hydroclimate variability and sea surface temperature (SST), respectively, permitting an onshore-offshore climate comparison. The U1478 records establish the Limpopo catchment response to the switch in Indonesian Throughflow source waters, the mid-Pliocene Warm Period, and intensification of Northern Hemisphere glaciations at ∼2.7 Ma. Broad coherence between the δDwax and SST records supports a linkage between Indian Ocean temperatures and southeast African hydroclimate. We hypothesize that additional mechanisms including Indian Ocean cross-basin SST gradients (ΔSST) and high latitude glaciation acted as hydroclimate controls during the Plio-Pleistocene. We use ΔSST to evaluate ocean-atmosphere patterns similar to the Indian Ocean Dipole (IOD) and establish generally wetter conditions in the region associated with positive IOD-like phases. Additionally, an obliquity signal evident in the δDwax record indicates that glacial-interglacial variability likely influenced the tropical rain belt position and also controlled rainfall. Hydroclimate and environmental conditions across the Plio-Pleistocene in southeast Africa may have important implications for regional hominin evolution. AU - Taylor, Audrey K. AU - Berke, Melissa A. AU - Castañeda, Isla S. AU - Koutsodendris, Andreas AU - Campos, Hernan AU - Hall, Ian R. AU - Hemming, Sidney R. AU - LeVay, Leah J. AU - Sierra, Alejandra Cartagena AU - O'Connor, Keith AU - the Expedition 361 Scientists DO - https://doi.org/10.1029/2020PA004186 IS - 3 N1 - https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020PA004186 PY - 2021 SN - 2572-4517 SP - e2020PA004186 ST - Plio-Pleistocene continental hydroclimate and Indian Ocean sea surface temperatures at the southeast African margin T2 - Paleoceanography and Paleoclimatology TI - Plio-Pleistocene continental hydroclimate and Indian Ocean sea surface temperatures at the southeast African margin UR - https://doi.org/10.1029/2020PA004186 VL - 36 ID - 12528 ER - TY - CPAPER AU - Underwood, M., Rabinowitz, H.S., Noda, A., Meneghini, F., Kutterolf, S., Hashimoto, Y., Engelmann de Oliveira, C., Saffer, D.M., Wallace, L.M., Barnes, P., Pecher, I.A., Petronotis, K.E., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Lithostratigraphy of the Hikurangi subduction inputs: results of coring during IODP Expedition 375 UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0307.html ID - 14728 ER - TY - JOUR AB - Non-intrusive track-based physical properties measurements of sediment cores recovered during ocean drilling are often biased by imperfect recovery within sediment core liners, particularly in heterogeneous and/or partially lithified sediments. These biases result in misrepresentation in measurements of true sediment physical properties, and can complicate integration of the composite site records assembled from recovered cores with borehole logs of the stratigraphic section. Here we develop a strategy utilizing gamma ray attenuation (GRA) density to generate mass-specific magnetic susceptibility (MS) and natural gamma radiation (NGR) data. Shipboard GRA density is collected in all cores that comprise a site at equivalent or higher resolution than the corresponding MS and NGR data. All instruments are calibrated assuming a volume of sediment in their detector windows equivalent to that present in a perfectly full core liner; changes in sediment bulk density related to compaction, and/or imperfect sediment recovery resulting in a partially filled core liner thus influence all three measurements proportional to their detector sensitivities. In principle it may be possible to correct MS or NGR data for variable sediment volume by normalizing them to GRA measured at equivalent depth on a sensing track, assuming that the volumetric bias is comparable in all three datasets. Because GRA is measured in much greater detail, it must be smoothed by the known measurement windows of the other parameters for the assumption of comparable analytical sediment volume to be true. Normalizing MS or NGR by the equivalently smoothed GRA in down-hole records should thus remove the bias associated with variable sediment volume in the detector windows, allowing for robust mass-specific determination of these volume-based sediment physical properties. AU - Walczak, M. H. AU - Mix, A. C. AU - Willse, T. AU - Slagle, A. AU - Stoner, J. S. AU - Jaeger, J. AU - Gulick, S. AU - LeVay, L. AU - Kioka, Arata IS - 2 J2 - Affiliation (analytic): Australian National University, Research School of Earth Sciences, Canberra, A.C.T. Affiliation (monographic): Australian National University, Research School of Earth Sciences, Canberra, A.C.T., Australia Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 341 Scientific Party Coordinates: N565700 N594200 W1431000 W1470700 illus. Contains 7 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Geophysical Journal International, 202(2), p.1317-1323. Publisher: Oxford University Press on behalf of The Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft and the European Geophysical Society, International. ISSN: 0956-540X Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2016019007 DOI: 10.1093/gji/ggv204 KW - Algorithms Attenuation Compaction Corrections Downhole methods Drilling East Pacific Expedition 341 Gamma rays Gulf of Alaska IODP Site U1417 IODP Site U1418 IODP Site U1419 Integrated Ocean Drilling Program Magnetic properties Magnetic susceptibility North Pacific Northeast Pacific Pacific Ocean Paleomagnetism Sediments Volume Well-logging 06 Petrology, Sedimentary 20 Geophysics, Applied LA - English PY - 2015 SN - 0956-540X SP - 1317–1323 ST - Correction of non-intrusive drill core physical properties data for variability in recovered sediment volume T2 - Geophysical Journal International TI - Correction of non-intrusive drill core physical properties data for variability in recovered sediment volume UR - https://doi.org/10.1093/gji/ggv204 VL - 202 ID - 607 ER - TY - CPAPER AU - Wallace, L.M., Barnes, P., Saffer, D.M., Henrys, S.A., Barker, D.H.N., Bassett, D., Caratori Tontini, F., Kaneko, Y., Ito, Y., Mochizuki, K., Webb, S.C., Clark, K., Cochran, U.A., Litchfiend, N.J., Williams, C.A., Jr., Ellis, S.M., Fry, B., Todd, E., Bell, R.E., Petronotis, K.E., Pecher, I.A., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - The dynamics of shallow plate interface slip at the offshore Hikurangi subduction margin, New Zealand UR - https://abstractsearch.agu.org/meetings/2018/FM/T52C-03.html ID - 14729 ER - TY - CPAPER AU - Wallace, L.M., Solomon, E.A., Fulton, P.M., Saffer, D.M., Petronotis, K.E., Jannasch, H.W., Davis, E.E., Rhinehart, KB., Van Hyfte, J., Grigar, K., Barnes, P., Bell, R.E., Pecher, I.A., and LeVay, L.J. CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - IODP borehole observatories to monitor slow slip at the offshore Hikurangi subduction zone UR - https://abstractsearch.agu.org/meetings/2018/FM/T51I-0293.html ID - 14730 ER - TY - BOOK AU - Wallace, L.M., Saffer, D.M., Barnes, P.M., Pecher, I.A., Petronotis, K.E., LeVay, L.J., and the Expedition 372/375 Scientists CY - College Station, TX DO - https://doi.org/10.14379/iodp.proc.372B375.2019 J2 - Affiliation (analytic): University of Auckland, School of Environmental and Marine Sciences, Auckland Corporate Affiliation (monographic): International Ocean Discovery Program, Expedition 372B Scientists, College Station, TX Coordinates: S385133 S385133 E1785346 E1785346; S384338 S384338 E1783654 E1783651; S385810 S385810 E1790756 E1790756; S390119 S390119 E1791445 E1791445 Research Program: IODP Integrated Ocean Drilling Program; IODP2 International Ocean Discovery Program Document Type: Monograph Bibliographic Level: Monograph Source Note: Proceedings of the International Ocean Discovery Program, Expedition Reports, Vol.372B/375. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 2377-3189 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2019046811 DOI: 10.14379/iodp.proc.372B375.2019 KW - Australasia Biostratigraphy Boreholes Cenozoic Clastic rocks Continental margin Cores Expedition 372 Expedition 375 Foraminifera Geochemistry Geophysical methods Geophysical profiles Geophysical surveys Hikurangi Margin Hikurangi Trough Holocene Hydrochemistry IODP Site U1518 IODP Site U1519 IODP Site U1520 IODP Site U1526 International Ocean Discovery Program Lithostratigraphy Magnetostratigraphy Marine sediments Microfossils Nannofossils New Zealand North Island Pacific Ocean Paleomagnetism Physical properties Pleistocene Pore water Quaternary Sedimentary rocks Sediments Seismic methods Seismic profiles Seismic stratigraphy South Pacific Southwest Pacific Structural analysis Surveys Well logs West Pacific 12 Stratigraphy, Historical Geology and Paleoecology 16 Structural Geology 20 Geophysics, Applied LA - English M1 - Proceedings of the International Ocean Discovery Program PB - International Ocean Discovery Program PY - 2019 SN - 2377-3189 ; ST - Hikurangi Subduction Margin Coring, Logging, and Observatories TI - Hikurangi Subduction Margin Coring, Logging, and Observatories UR - https://doi.org/10.14379/iodp.proc.372B375.2019 VL - 372B/375 ID - 5470 ER - TY - CPAPER AU - Wei, L., Cook, A., Nole, M., Malinverno, A., Daigle, H., Georgiopoulou, A., Barnes, P., Pecher, I.A., LeVay, L.J., the IODP Expedition 372 Scientists, and the IODP Expedition 375 Scientists CY - Washington, DC DA - 10–14 December 2018 PY - 2018 T2 - 2018 American Geophysical Union Fall Meeting TI - Gas hydrate accumulations in thin sands UR - https://abstractsearch.agu.org/meetings/2018/FM/OS31F-1853.html ID - 14732 ER - TY - CHAP A2 - Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists AB - To reconstruct the climate history of the equatorial Pacific, one major objective of the Pacific Equatorial Age Transect (PEAT) program is to compile a Cenozoic megasplice that integrates all available bio-, chemo-, and magnetostratigraphic data including key records from Ocean Drilling Program (ODP) Leg 199. In order to do so, extended postcruise refinements of the shipboard composite depth scales and composite records are required. Here, we present a revised depth scale of Integrated Ocean Drilling Program (IODP) Expedition 320 Sites U1331, U1332, U1333, and U1334 as well as Leg 199 Sites 1218, 1219, and 1220. The revised composite records were used to perform site-to-site correlation and integration of Leg 199 and Expedition 320 sites. Based on this decimeter scale correlation, a high-resolution integrated paleomagnetic, calcareous nannofossil, and radiolarian stratigraphy for the equatorial Pacific is established that covers the time from 20 to 40 Ma. This sedimentary compendium from the equatorial Pacific will be the backbone for paleoceanographic reconstructions for the late Paleogene. AU - Westerhold, T., Röhl, U., Wilkens, R., Pälike, H., Lyle, M., Jones, T.D., Bown, P., Moore, T., Kamikuri, S., Acton, G., Ohneiser, C., Yamamoto, Y., Richter, C., Fitch, P., Scher, H., Liebrand, D., and the Expedition 320/321 Scientists CY - Tokyo J2 - Affiliation (analytic): University of Bremen, Center for Marine Environmental Sciences, Bremen Affiliation (monographic): University of Bremen, Center for Marine Environmental Sciences, Bremen, Germany Corporate Affiliation (monographic): Intergated Ocean Drilling Program, Expedition 320 Scientists, College Stattion, TX Coordinates: N120405 N120405 W1420942 W1420942; N115443 N115443 W1410244 W1410244; N103100 N103100 W1382510 W1382510; N080000 N080000 W1315824 W1315824; N085300 N085300 W1352200 W1352200; N074800 N074800 W1420100 W1420100; N101100 N101100 W1424500 W1424600 illus., incl. 45 tables, sketch map Contains 38 references Research Program: IODP Integrated Ocean Drilling Program; ODP Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Proceedings of the Integrated Ocean Drilling Program; Pacific equatorial age transect; Expeditions 320 and 321 of the riserless drilling platform from and to Honolulu, Hawaii (USA), Sites U1331-U1336, 5 March-4 May 2009; and Honolulu, Hawaii (USA), to San Diego, California (USA), Sites U1337-U1338, 4 May-22 June 2009, Heiko Palike, Hiroshi Nishi, Adam Klaus, Helen Evans, Trevor Williams, Gary D. Acton, Paul Bown, Margaret Delaney, Tom Dunkley Jones, Kirsty Edgar, Peter Fitch, Nikolaus Gussone, Jens Herrle, Kiseong Hyeong, Shin-ichi Kamikuri, Junichiro Kuroda, Lizette Leon-Rodriguez, Theodore Moore, Jr., Brandon Murphy, Hideto Nakamura, Christian Ohneiser, Carl Richter, Rebecca Robinson, Ken Sawada, Howie Scher, Hiroyuki Takata, Thomas Westerhold, Paul A. Wilson, Yuhji Yamamoto, Mitchell W. Lyle, Isabella Raffi, Kusali Gamage, Louise Anderson, Alberto Malinverno, Jan Backman, Catherine Beltran, William Busch, James Channell, Pawan Dewangan, Hitoshi Hasegawa, Edmund Hathorne, Hiroki Hayashi, Ann Holbourn, Steven Hovan, Koichi Iijima, Takashi Ito, Katsunori Kimoto, Daniel Murphy, Kaoru Ogane, Oscar Romero, Leah Schneider, Appy Sluijs, Tian Jun, Akira Tsujimoto, Bridget Wade, Roy Wilkens, Shinya Yamamoto and Toshitsugu Yamazaki; Integrated Ocean Driling Program, Expedition 320 Scientists, College Station, TX; Integrated Ocean Driling Program, Expedition 321 Scientists. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.320/321, 137p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2013025220 DOI: 10.2204/iodp.proc.320321.201.2012 KW - Algae Biostratigraphy Boreholes Cenozoic Cores Correlation Density East Pacific Equatorial Pacific Expedition 320 Expeditions 320/321 Gamma-ray spectra IODP SIte U1334 IODP Site U1331 IODP Site U1332 IODP Site U1333 Integrated Ocean Drilling Program Invertebrata Leg 199 Magnetic properties Magnetic susceptibility Magnetostratigraphy Marine sediments Microfossils Nannofossils North Pacific Northeast Pacific ODP Site 1218 ODP Site 1219 ODP Site 1220 Ocean Drilling Program Pacific Ocean Paleomagnetism Physical properties Plantae Protista Radiolaria Sediments Spectra Tertiary Well logs 12 Stratigraphy, Historical Geology and Paleoecology LA - English N1 - Westerhold, Thomas Röhl, Ursula Wilkens, Roy Palike, Heiko Lyle, Mitch Dunkley Jones, Tom Bown, Paul Moore, Ted Kamikuri, Shin-ichi Acton, Gary Ohneiser, Christian Yamamoto, Yuhji Richter, Carl Fitch, Peter Scher, Howie Liebrand, Diederik Nishi, Hiroshi Klaus, Adam Evans, Helen Williams, Trevor Delaney, Margaret Edgar, Kirsty Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kuroda, Junichiro Leon-Rodriguez, Lizette Murphy, Brandon Robinson, Rebecca Sawada, Ken Takata, Hiroyuki Wilson, Paul A. Raffi, Isabella Gamage, Kusali Anderson, Louise Malinverno, Alberto Backman, Jan Beltran, Catherine Busch, William Channell, James Dewangan, Pawan Hasegawa, Hitoshi Hathorne, Edmund Hayashi, Hiroki Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsunori Murphy, Daniel Ogane, Kaoru Romero, Oscar Schneider, Leah Sluijs, Appy Jun Tian Tsujimoto, Akira Wade, Bridget Yamamoto, Shinya Yamazaki, Toshitsugi Expedition Synthesis PB - Integrated Ocean Drilling Program Management International, Inc. PY - 2012 SN - 1930-1014 ST - Revised composite depth scales and integration of IODP Sites U1331–U1334 and ODP Sites 1218–1220 T2 - Proceedings of the Integrated Ocean Drilling Program TI - Revised composite depth scales and integration of IODP Sites U1331–U1334 and ODP Sites 1218–1220 UR - https://doi.org/10.2204/iodp.proc.320321.201.2012 VL - 320/321 ID - 4116 ER - TY - CHAP A2 - Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists AB - The eastern equatorial Pacific (EEP) is one of the most dynamic regions of the open ocean. To fully appreciate the history of this area in the time domain, correlative and complete sedimentary records are required from multiple drill sites. One essential step for each site is the construction of an accurate composite depth scale, whereby selected intervals of successive cores from proximal holes are spliced together to render a full stratigraphic section. Here, we generate revised composite depth scales for Integrated Ocean Drilling Program (IODP) Sites U1336, U1337, and U1338, recovered during IODP Expeditions 320 and 321. Composite sections were generated using physical properties data overlain on high-resolution scanned images of adjacent core sections from all holes cored at a site. Coring disturbance, particularly deeper in the holes, prevented composite construction to total depth at each site. At Site U1336, utilizing two holes, the composite record reaches almost 135 m core composite depth below seafloor (CCSF). At Site U1337, with four holes, a depth of close to 450 m CCSF was reached with only three gaps. Using the three holes of Site U1338, a composite section of almost 400 m CCSF was developed with only two breaks. Composite depth records are crucial for working on these sites because sediment composition varies considerably over short (<30 cm) depth intervals. The composite gamma ray attenuation density records will be particularly important to a range of studies in the region because they can be coupled to those collected at earlier drill sites in the EEP. AU - Wilkens, R.H., Dickens, G.R., Tian, J., Backman, J., and the Expedition 320/321 Scientists CY - Tokyo J2 - Affiliation (analytic): University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, Honolulu, HI Affiliation (monographic): University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, Honolulu, HI, United States Corporate Affiliation (monographic): Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX Coordinates: N074204 N074204 W1281515 W1281515; N035000 N035000 W1231222 W1231222; N023028 N023028 W1175811 W1175811 illus., incl. 6 tables, sketch map Contains 9 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Proceedings of the Integrated Ocean Drilling Program; Pacific Equatorial Age Transect; Expeditions 320 and 321 of the riserless drilling platform from and to Honolulu, Hawaii (USA); Sites U1331-U1336, 5 March-4 May 2009; and Honolulu, Hawaii (USA), to San Diego, California (USA); Sites U1337-U1338, 4 May-22 June 2009, Heiko Palike, Hiroshi Nishi, Adam Klaus, Helen Evans, Trevor Williams, Gary D. Acton, Paul Bown, Margaret Delaney, Tom Dunkley Jones, Kirsty Edgar, Peter Fitch, Nikolaus Gussone, Jens Herrle, Kiseong Hyeong, Shin-Ichi Kamikuri, Junichiro Kuroda, Lizette Leon-Rodriguez, Theodore Moore, Jr., Brandon Murphy, Hideto Nakamura, Christian Ohneiser, Carl Richter, Rebecca Robinson, Ken Sawada, Howie Scher, Hiroyuki Takata, Thomas Westerhold, Paul A. Wilson, Yuhji Yamamoto, Mitchell W. Lyle, Isabella Raffi, Kusali Gamage, Louise Anderson, Alberto Malinverno, Jan Backman, Catherine Beltran, William Busch, James E. T. Channell, Pawan Dewangan, Hitoshi Hasegawa, Edmund Hathorne, Hiroki Hayashi, Ann Holbourn, Steven Hovan, Koichi Iijima, Takashi Ito, Katsunori Kimoto, Daniel Murphy, Kaoru Ogane, Oscar E. Romero, Leah Schneider, Appy Sluijs, Jun Tian, Akira Tsujimoto, Bridget Wade, Roy H. Wilkens, Shinya Yamamoto and Toshitsugu Yamazaki; Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX; Integrated Ocean Drilling Program, Expedition 321 Scientists. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.320/321, 158p. Publisher: Integrated Ocean Drilling Program Management International for the Integrated Drilling Program (IODP), Washington, DC, United States. ISSN: 1930-1014 Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. GeoRef ID: 2014053693 DOI: 10.2204/iodp.proc.320321.209.2013 KW - Cenozoic Cores Correlation Depth East Pacific Equatorial Pacific Expedition 320 Expedition 321 Expeditions 320/321 IODP Site U1336 IODP Site U1337 IODP Site U1338 Integrated Ocean Drilling Program Lithostratigraphy Marine sediments North Pacific Northeast Pacific Pacific Ocean Physical properties Sediments 06 Petrology, Sedimentary 07 Marine Geology and Oceanography LA - English N1 - Palike, Heiko Nishi, Hiroshi Klaus, Adam Evans, Helen Williams, Trevor Acton, Gary D. Bown, Paul Delaney, Margaret Dunkley Jones, Tom Edgar, Kirsty Fitch, Peter Gussone, Nikolaus Herrle, Jens Hyeong, Kiseong Kamikuri, Shin-ichi Kuroda, Junichiro Leon-Rodriguez, Lizette Moore, Theodore, Jr. Murphy, Brandon Nakamura, Hideto Ohneiser, Christian Richter, Carl Robinson, Rebecca Sawada, Ken Scher, Howie Takata, Hiroyuki Westerhold, Thomas Wilson, Paul A. Yamamoto, Yuhji Lyle, Mitchell W. Raffi, Isabella Gamage, Kusali Anderson, Louise Malinverno, Alberto Beltran, Catherine Busch, William Channell, James E. T. Dewangan, Pawan Hasegawa, Hitoshi Hathorne, Edmund Hayashi, Hiroki Holbourn, Ann Hovan, Steven Iijima, Koichi Ito, Takashi Kimoto, Katsunori Murphy, Daniel Ogane, Kaoru Romero, Oscar E. Schneider, Leah Sluijs, Appy Tsujimoto, Akira Wade, Bridget Yamamoto, Shinya Yamazaki, Toshitsugu PB - Integrated Ocean Drilling Program Management International, Inc. PY - 2013 SN - 1930-1014 ST - Data report: revised composite depth scales for Sites U1336, U1337, and U1338 T2 - Proceedings of the Integrated Ocean Drilling Program TI - Data report: revised composite depth scales for Sites U1336, U1337, and U1338 UR - https://doi.org/10.2204/iodp.proc.320321.209.2013 VL - 320/321 ID - 4050 ER - TY - JOUR AB - ABSTRACTGlacio-eustatic cycles lead to changes in sedimentation on all types of continental margins. There is, however, a paucity of sedimentation rate data over eustatic sea-level cycles in active subduction zones. During International Ocean Discovery Program Expedition 375, coring of the upper ?110?m of the northern Hikurangi Trough Site U1520 recovered a turbidite-dominated succession deposited during the last ?45 kyrs (Marine Isotope Stages (MIS) 1?3). We present an age model integrating radiocarbon dates, tephrochronology, and δ18O stratigraphy, to evaluate the bed recurrence interval (RI) and sediment accumulation rate (SAR). Our analyses indicate mean bed RI varies from ?322 yrs in MIS1, ?49 yrs in MIS2, and ?231 yrs in MIS3. Large (6-fold) and abrupt variations in SAR are recorded across MIS transitions, with rates of up to ?10?m/kyr occurring during the Last Glacial Maximum (LGM), and <1?m/kyr during MIS1 and 3. The pronounced variability in SAR, with extremely high rates during the LGM, even for a subduction zone, are the result of changes in regional sediment supply associated with climate-driven changes in terrestrial catchment erosion, and critical thresholds of eustatic sea-level change altering the degree of sediment bypassing the continental shelf and slope via submarine canyon systems. AU - Woodhouse, Adam AU - Barnes, Philip M. AU - Shorrock, Anthony AU - Strachan, Lorna J. AU - Crundwell, Martin AU - Bostock, Helen C. AU - Hopkins, Jenni AU - Kutterolf, Steffen AU - Pank, Katharina AU - Behrens, Erik AU - Greve, Annika AU - Bell, Rebecca AU - Cook, Ann AU - Petronotis, Katerina AU - LeVay, Leah AU - Jamieson, Robert A. AU - Aze, Tracy AU - Wallace, Laura AU - Saffer, Demian AU - Pecher, Ingo DO - 10.1080/00288306.2022.2099432 N1 - https://www.tandfonline.com/doi/abs/10.1080/00288306.2022.2099432 PY - 2022 SN - 0028-8306 ST - Trench floor depositional response to glacio-eustatic changes over the last 45 ka, northern Hikurangi subduction margin, New Zealand T2 - New Zealand Journal of Geology and Geophysics TI - Trench floor depositional response to glacio-eustatic changes over the last 45 ka, northern Hikurangi subduction margin, New Zealand UR - https://doi.org/10.1080/00288306.2022.2099432 ID - 48850 ER - TY - CPAPER AB - Abstract MIS16-P01 AU - Yamamoto, M., Usui, Y., Go-Ichiro, U., Ando, T., Clemens, S., Wolfgang, K., LeVay, L., and IODP Expedition 353 Scientists CY - Chiba, Japan DA - 22–26 May 2016 PY - 2016 T2 - 2016 Japan Geoscience Union Meeting TI - Drilling in the Bay of Bengal for reconstruction of the Indian summer monsoon variability UR - http://www2.jpgu.org/meeting/2016/session/PDF/M-IS16/MIS16-P01_e.pdf ID - 15968 ER - TY - JOUR AU - Zindorf, M., März, C., Wagner, T., Strauss, H., Gulick, S.P.S., Jaeger, J.M., and LeVay, L.J. PY - 2016 SP - EGU2016-11923 ST - Deep aquifer as driver for mineral authigenesis in Gulf of Alaska sediments (IODP Expedition 341, Site U1417) T2 - Geophysical Research Abstracts TI - Deep aquifer as driver for mineral authigenesis in Gulf of Alaska sediments (IODP Expedition 341, Site U1417) UR - http://meetingorganizer.copernicus.org/EGU2016/EGU2016-11923.pdf VL - 18 ID - 15477 ER - TY - JOUR AB - Sediment samples from the Gulf of Alaska (GOA, IODP Expedition 341, Site U1417) have been analyzed to understand present and past diagenetic processes that overprint the primary sediment composition. No Sulfate-Methane Transition Zone (SMTZ) was observed at the zone of sulfate depletion, but a >200 m thick sulfate- and methane-free sediment interval occurred between the depth of sulfate depletion (≈200 m) and the onset of methanogenesis (≈440 m). We suggest that this apparent gap in biogeochemical processing of organic matter is caused by anaerobic oxidation of methane fueled by sulfate which is released during dissolution of barites at the upper boundary of the methane rich layer. Beneath the methanogenic zone, at ≈650 m depth, pore-water sulfate concentrations increase again, indicating sulfate supply from greater depth feeding into a deep, inverse SMTZ. A likely explanation for the availability of sulfate in the deep sub-seafloor at U1417 is the existence of a deep aquifer related to plate bending fractures, which actively transports sulfate-rich water to, and potentially along, the interface between sediments and oceanic crust. Such inverse diagenetic zonations have been previously observed in marine sediments, but have not yet been linked to subduction-related plate bending. With the discovery of a deep inverse SMTZ in an intra-oceanic plate setting and the blocking of upward methane diffusion by sulfate released from authigenic barite dissolution, Site U1417 provides new insights into sub-seafloor pore-fluid and gas dynamics, and their implications for global element cycling and the deep biosphere. AU - Zindorf, Mark AU - Marz, Christian AU - Wagner, Thomas AU - Gulick, Sean P. S. AU - Strauss, Harald AU - Benowitz, Jeff AU - Jaeger, John AU - Schnetger, Bernhard AU - Childress, Laurel AU - LeVay, Leah AU - van der Land, Cees AU - La Rosa, Michelle J2 - Affiliation (analytic): Newcastle University, School of Natural and Environmental Sciences, Newcastle upon Tyne Affiliation (monographic): Newcastle University, School of Natural and Environmental Sciences, Newcastle upon Tyne, United Kingdom Coordinates: N565735 N565736 W1470635 W1473600 illus., incl. sect., sketch map Contains 98 references Research Program: IODP Integrated Ocean Drilling Program Document Type: Journal Article Bibliographic Level: Analytic Source Note: Marine Geology, Vol.417. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands GeoRef ID: 2020010520 DOI: 10.1016/j.margeo.2019.105986 KW - Aliphatic hydrocarbons Alkanes Cenozoic Cores Diagenesis Early diagenesis East Pacific Expedition 341 Geophysical methods Geophysical profiles Geophysical surveys Gulf of Alaska Hydrocarbons IODP Site U1417 Integrated Ocean Drilling Program Lithofacies Lower Miocene Marine sediments Methane Miocene Neogene North Pacific Northeast Pacific Organic compounds Pacific Ocean Pore water Sediments Seismic methods Seismic profiles Sulfates Surveys Tertiary 12 Stratigraphy, Historical Geology and Paleoecology 20 Geophysics, Applied LA - English PY - 2019 SN - 0025-3227 SP - 105986 ST - Deep sulfate-methane-transition and sediment diagenesis in the Gulf of Alaska (IODP Site U1417) T2 - Marine Geology TI - Deep sulfate-methane-transition and sediment diagenesis in the Gulf of Alaska (IODP Site U1417) UR - https://doi.org/10.1016/j.margeo.2019.105986 VL - 417 ID - 611 ER -