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 -