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IODP Expedition 323

Bering Sea Paleoceanography

Daily Science Report for 31 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2139.5 mbsl)

SCIENCE UPDATE: We completed coring Hole U1341B to a total depth of 600 m CSF-A, recovering 589.3 m of sediment (98%). Preparation for logging operations at Hole U1341B are underway. All wholeround core sections from Hole U1341B have been measured for physical properties using the laboratory track systems. Cores U1341B-30H through 58X have been split, imaged, measured on the section half loggers and described. Sediments are alternating dark grayish olive diatom silt and clay to light olive green diatom ooze; slightly to moderately bioturbated; occasional ash layers with volcanic clasts; laminated or thin layered intervals, ice-rafted debris, and dolomite nodules. Two ~12-14 cm thick dolomite layers were found in Core U1341B-58X. The top of most cores below Core U1341B-57X contain gravel considered to be 'fall-in' from a gravel layer recovered higher in the stratigraphic section. The top of the Gauss normal polarity Chron (2.58 Ma) is identified in Core 39H in Hole U1341A and in Core 38H in Hole U1341B. The age at the bottom of the cored section at Hole U1341B (Core Catcher U1341B-71X-CC) is estimated at 3.8-4.0 Ma according to radiolarian biostratigraphy. Catwalk samples from Hole U1341B are being measured for organic and inorganic geochemistry. Expedition scientists are working on their site reports.


Daily Science Report for 30 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2139.5 mbsl)

SCIENCE UPDATE: We continue coring Hole U1341B. By midnight, APC Cores U1341B-32H through 53H (293.3 to 458.4 m) were recovered (97.6 % recovery) shattering the previous APC depth record reached during IODP Expedition 321. All cores from Hole U1341B recovered before midnight were measured for physical properties using the Fast Track system and up to Core U1341B-30H using the rest of the track systems. Cores U1341B-16H through 29H have been split, imaged, measured on the section half loggers and described. Sediments are alternating dark grayish olive diatom silt and clay to light olive green diatom ooze; slightly to moderately bioturbated; occasional ash layers with volcanic clasts; ice-rafted debris, and dolomite nodules in early state of formation. The Bruhnes/Matuyama boundary was identified in Core U1341B-9H, the Jaramillo Subchron occurs between Cores U1341B-12H and -15H (103.7-141.7 m CSF-A) and the Olduvai Subchron occurs between Cores U1341B-25H and -28H (218.7 and 256.7 m CSF-A). All Catwalk IW samples from Hole U1341B are being measured for organic and inorganic geochemistry. Expedition scientists are working on the Site U1340 reports.


Daily Science Report for 29 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2139.5 mbsl)

SCIENCE UPDATE: We continue coring Hole U1341B. By midnight, APC Cores U1341B-3H through 32H (18.2 to 293.3 m) were recovered (102.3%). Most cores from Hole U1341B have been measured for physical properties in the wholeround track systems and up to Core U1341B-16H have been split, imaged, measured on the section half loggers and described. The cored sedimentary section contains alternating dark grayish olive diatom silt and clay to light olive green diatom ooze; slightly to moderately bioturbated; occasional ash layers with volcanic clasts; ice-rafted debris, and dolomite nodules in early state of formation. The age at the base of Core U1341B-36H (core catcher sample) is estimated at ~3.0 Ma based on radiolarian, diatom and ebridian biostratigraphic markers. All Catwalk IW samples from Hole U1341A have been measured for organic and inorganic geochemistry. Expedition scientists are working on and submitting their reports for Site U1340.


Daily Science Report for 28 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2139.5 mbsl)

SCIENCE UPDATE: Hole U1341A ended at 1730 hr after APC Core U1341A-41H recovered just 2.92 m of sediment. The total depth penetrated in Hole U1341A was 359.2 m with a recovery of 103%. All cores have been measured on the wholeround track systems and up to Core U1341A-37H have been split, measured in the section half loggers and described. Cores U1341A-12H through 37H contain alternating dark grayish olive to light olive green diatom ooze, with minor diatom silt and diatom clay; slightly to moderately bioturbated with occasional ash layers and laminated intervals. Dolomite nodules were observed in Core U1341A-34H. The Jaramillo Subchron occurs between Cores U1341A-13H and 15H (107.5-135.0 m DSF). The age at the base of Core U1341A-41H (core catcher sample) is estimated at 2.5-2.7 Ma based on diatoms' and ebridians' biostratigraphic markers. All catwalk samples from Hole U1341A have being measured for alkalinity, pH and DIC. At 2245 hr, Hole U1341B was spudded 20 m east of Hole U1341A and the first two APC cores were recovered by midnight. The science meeting for Site U1340 was held at the end of the morning and the expedition scientists presented their results to the entire scientific party.


Daily Science Report for 27 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2139.5 mbsl)

SCIENCE UPDATE: Hole U1341A was spudded at 0510 hr establishing a seafloor depth of 2139.5 mbsl. By midnight, Cores U1341A-1H through 24H were recovered and all but the last 4 cores were measured for natural gamma, density, magnetic susceptibility, thermal conductivity, and P-wave velocity using the ship's laboratory track systems. Cores U1341A-1H through 18H have been split, and their archive halves imaged, measured for color reflectance and described. Cores U1341A-1H through 11H have been measured in the cryogenic magnetometer. The sediments are mostly dark grayish olive to olive green diatom ooze, with minor diatom silt and diatom clay; slightly to moderately bioturbated with occasional ash layers. Dolomite nodules occur in Core U1341A-18H. The Bruhnes/Matuyama boundary was identified in Core U1341A-10H and the age at the base of Core U1341A-15H (core catcher sample) is estimated at 0.9-1.4 Ma according to biostratigraphic markers. Routine catwalk samples are being measured for alkalinity, pH and DIC. Scientists are working on the data collected and preparing presentations for the science meeting.


Daily Science Report for 26 July 2009

LOCATION: At Site U1341 (BOW-14B), 54°2.0'N, 179°0.5'E (2177 mbrf)

SCIENCE UPDATE: We cored Holes U1340B, U1340C, and U1340D to a depth of 55.53, 29.49 and 27.04 m DSF, respectively, and as far away as possible from each other within the beacon range in an effort to avoid the slumped sediments encountered in Hole U1340A. However, all holes yielded slumped sediments at similar depths. All Site U1340 core sections were measured through the track systems (natural gamma, density, magnetic susceptibility, thermal conductivity, etc) and split. The section halves were imaged, measured for color reflectance and described. Routine shipboard samples are being measured for organic and inorganic geochemistry. Scientists are working on the data collected.


Daily Science Report for 25 July 2009

LOCATION: At Site U1340 (BOW-12B), 53°24.0'N, 179°31.3'W (1324 mbrf)

SCIENCE UPDATE: Hole U1340A was ended at 604.6 m DSF after reaching XCB refusal. Cores U1340-42H through 71X penetrated from 358.7 to 604.6 m DSF and recovered 368.8 m more of sediment. The total recovery for Hole U1340A was 530.81 m (88%). The coring system was switched back to APC for Cores U1340A-63H through 67H after three XCB cores returned empty. All remaining cores from Hole U1340A have been measured through the track systems (natural gamma, density, magnetic susceptibility, thermal conductivity, etc) and Cores U1340A-36H through 68X have been imaged, measured for color reflectance and described. The stratigraphic section at Hole U1340A is made predominantly of diatom ooze with foraminifer-bearing diatom ooze, dispersed ash and occasional thin dark and light ash layers. A dark gray sand layer with abundant sponge spicules and diatoms was recovered in Core U1340A-64H. Biostratigraphic results propose a preliminary age of 3.8-4.0 Ma between Core Catcher Samples U1340A-58H-CC and 65H-CC (~495-557 m DSF). The Jaramillo Subchron occurs between 144.4 and 163.4 m DSF; the Olduvai Subchron occurs between 210 and 225 m DSF. The Gauss/Matuyama boundary was tentatively placed at 262 m DSF. The ship was offset 350 m to the east and Hole U1340B was spudded at 23:40 hrs local time. Core U1340B-1H was recovered just before midnight.


Daily Science Report for 24 July 2009

LOCATION: At Site U1340 (BOW-12B), 53°24.0'N, 179°31.3'W (1324 mbrf)

SCIENCE UPDATE: APC Cores U1340-25H through 42H penetrated from 205.7 to 358.7 m DSF and recovered 162 m of sediment (recovery 102%). The coring system was changed to XCB after the last two APC cores recovered less than 50%. Cores U1340A-43X through 48X penetrated from 358.7 to 409.1 m (recovery 46.7%). The first three XCB cores (U1340A-43X through 45X) contained less than half a meter of sediment. All cores up to Core U1340A-59X have been measured with the natural gamma, density, magnetic susceptibility and thermal conductivity tools. Cores U1340A-7H through 36H have been split, imaged, measured for color reflectance and described. The stratigraphic section is comprised predominantly of diatom ooze with foraminifer-bearing diatom ooze, dispersed ash and occasional thin dark and light ash layers. Biostratigraphic results propose a preliminary age of 3.2 Ma at ~340 m DSF (U1340A-39H-CC).


Daily Science Report for 23 July 2009

LOCATION: At Site U1340 (BOW-12B), 53°24.0'N, 179°31.3'W (1324 mbrf)

SCIENCE UPDATE: Hole U1340A was spudded at 0520 hrs establishing a seafloor depth of 1306 m DRF. APC Cores U1340-1H through 24H (0-205.7 m) were recovered by midnight (recovery 100%). Cores U1340A-1H to 6H have been split, imaged and described. Cores 1H through 6H contain silty diatom ooze to foraminifer-bearing diatom ooze. Cores 4H through 6H appear to contain slumped sediments. Sediment color varies from light to dark green to grayish green, with occasional to rare ash layers and silicoflagellate-rich laminae. The upper 6 cores cover the last ~0.4 Ma based on preliminary biostratigraphic results. Expedition scientists presented the results from Site U1339 during the site meeting and continue working on the site reports.


Daily Science Report for 22 July 2009

LOCATION: At Site U1340 (BOW-12B), 53°24.0'N, 179°31.3'W (1324 mbrf)

SCIENCE UPDATE: Expedition scientists finished describing cores from Hole U1339D, and analyzing and interpreting geochemical, geophysical and micropaleontological data from Site U1339. Co-Chiefs provided an overview of the scientific objectives and planned coring and logging operations for the three upcoming drill sites on the Bowers Ridge. Scientists are working on their site reports and preparing presentations for the science meeting. We arrived at Site U1340 at 2300 hrs local time.


Daily Science Report for 21 July 2009

LOCATION: En route to Site U1340 (BOW-12B)

SCIENCE UPDATE: Expedition scientists continue describing the cored sedimentary section of Site U1339, and analyzing geochemical, geophysical and micropaleontological data. Sediments in Cores U1339C-10H to 21H and U1339D-1H to 10H vary from green to grayish green diatomaceous ooze and diatomaceous silts with frequent ash layers, variable amounts of dispersed vitric ash, occasional thin IRD layers, burrows and isolated pebbles. Scientists are working on their site reports and preparing presentations for the science meeting.


Daily Science Report for 20 July 2009

LOCATION: At Site U1339 (UMK-4D), 54°40.2'N, 169°58.9'W (1867 mbsl)

SCIENCE UPDATE: We recovered Cores U1339D-9H to 22H (103% recovery) completing Hole U1339D to a total depth of 200 m below seafloor at 0930 hrs. Wireline logging preparations started soon after and by midnight, Hole U1339D was logged using the Triple Combo and FMS tools. Sediments in Cores U1339C-1H to 9H are predominantly green to grayish green silty to clayey diatomaceous ooze with variable amounts of dispersed vitric ash, occasional thin IRD layers, burrows and isolated pebbles. Distinct ash layers and laminated intervals are common throughout the section. The age interval recovered at Site U1339 is at least 0.74 My based on silicoflagellate, radiolarian and diatom biostratigraphy. Estimated ages are supported by our physical property records which are in good agreement with other records from the region. Geochemical analyses have been completed. Expedition scientists continue describing core, reviewing their data and working on their reports.


Daily Science Report for 19 July 2009

LOCATION: At Site U1339 (UMK-4D), 54°40.2'N, 169°58.9'W (1867 mbsl)

SCIENCE UPDATE: We recovered Cores U1339C-3H to 21H completing Hole U1339C to a total depth of 194.8 m (102% recovery) at 1445 hrs. Hole U1339D was spudded at 1725 hrs and Cores U1339D-1H to 8H (0-76.3 m, recovery: 103.5%) were recovered before midnight. Coring of Hole U1339D is being carefully guided by the stratigraphic correlators to assure covering of any gaps left in the previous holes. Sediments in Cores U1339B-9H to 22H are predominantly green to grayish green silty to clayey diatomaceous ooze with variable amounts of dispersed vitric ash, occasional thin IRD layers, isolated pebbles, distinct ash layers and laminated intervals. Rare dolomite indurated layers are found in bottom half of the section. The age interval recovered in upper ~160 m in Holes U1339B and U1339C spans the last ~0.6 Ma according to diatom, radiolarian and silicoflagellate biostratigraphy. Estimated ages are supported by our physical property records which are in good agreement with other records from the region. Sediment gas expansion continues to affect most cores. Preliminary results from geochemical and microbiological analyses suggest very high microbial activity in the subsea floor sediments.


Daily Science Report for 18 July 2009

LOCATION: At Site U1339 (UMK-4D), 54°40.2'N, 169°58.9'W (1867 mbsl)

SCIENCE UPDATE: We recovered Cores U1339B-3H to 22H to complete Hole U1339B down to a total depth of 196 m (104% recovery) at 1900 hrs. Hole U1339C was spudded at 2230 hrs and Cores U1339C-1H and 2H (0-19.5 m, 101% recovery) were recovered before midnight. The sedimentary sections in Cores U1339A-1H to 4H and U1339B-5H to 9H are predominantly green silty to clayey diatomaceous ooze with variable amounts of dispersed vitric ash, occasional thin IRD layers, and isolated pebbles. Distinct ash layers and laminated intervals occur throughout the cored section. Gas expansion continued to affect most cores and two core liners cracked during processing. The age interval recovered in Hole U1339B spans the last ~800-900 ky according to radiolarian, diatom and dinoflagellate biostratigraphy. The age was confirmed by correlation of our physical properties records with those of previously recovered piston cores from the area. Microbiological sampling and geochemical analyses are in full swing.


Daily Science Report for 17 July 2009

LOCATION: At Site U1339 (UMK-4D), 54°40.2'N, 169°58.9'W (1867 mbsl)

SCIENCE UPDATE: Cores U1339A-1H to 4H from 0 to 33.4 m were recovered before a problem with the coring system required a round trip of the drill string and testing of the APC system that lasted most of the day. Coring continued later in the evening and Cores U1339B-1H and -2H were recovered just before midnight. Sediments in Core U1339-1H are predominantly silty to clayey diatomaceous ooze, with variable amounts of dispersed vitric ash and occasional thin IRD layers and isolated pebbles. Abundant gas expansion cracks are visible throughout the cored section. The sediment color is mostly dark olive green with grayish intervals and darker color ash layers. The age interval recovered in Hole U1339A spans the last ~100 ky according to radiolarian biostratigraphy and correlation of our magnetic susceptibility records with those of previously recovered piston cores from the area. Headspace gas samples showed methane concentrations of up to 18% in Cores U1339A-3H and 4H.


Daily Science Report for 16 July 2009

LOCATION: At Site U1339 (UMK-4D), 54°40.2'N, 169°58.9'W (1867 mbsl)

SCIENCE UPDATE: The Co-chief scientists gave presentation on Site UMK-4D science objectives and operations plan to the scientists. The USIO Staff Scientist gave a presentation on sampling, and a member of the science party gave a presentation on the tectonic history of the Bering Sea. The shipboard sampling plan and sampling shifts were reviewed. Ship's crew, scientists and technical staff prepare for coring, logging, and lab operations at Site U1339. JOIDES Resolution arrived at site and began dynamic positioning at 16:03 hrs. The ship's crew started assembling and lowering drill string to seafloor.


Daily Science Report for 15 July 2009

LOCATION: In transit to Site UMK-4D (U1339)

SCIENCE UPDATE: Chief scientists gave a presentation on the Bering Sea Expedition scientific objectives to the IODP Technical Staff and Transocean crew. A pre-site meeting was held between the Co-Chiefs, Staff Scientist/EPM, Operations Superintendent, Logging Staff Scientists, Schlumberger Engineer, Ship's Captain, OIM, and Tool Pusher to discuss and plan operations for Site U1339. Expedition scientists continue lab preparation and training. Science activities included preparation of smear slides and core description templates, Core, Chemistry, and Microbiology Labs instrument calibration and testing, Third-Party tool training (conductivity/resistivity probe), general lab preparation (acids for fixation of microbiological samples, washing of thousands of glass slides for smear slides and dozens of rhyzon samplers). Scientists continue discussing samples and postcruise research collaboration and editing the Methods section for the expedition report.


Daily Science Report for 14 July 2009

LOCATION: In transit to Site UMK-4D (U1339)

SCIENCE UPDATE: Expedition scientists continue lab preparation and training in anticipation of coring at Site U1339. Science activities included descriptions of practice core and smear slides from the reference collection, rhizon sampling test, instrument calibration, revision of explanatory notes, etc. The expedition science management team met to discuss and plan coring and logging operations at Site U1339.


Daily Science Report for 13 July 2009

LOCATION: In transit to Site UMK-4D (U1339)

SCIENCE UPDATE: Expedition scientists continue their lab training and orientation in preparation for coring at Site U1339. Geochemists and microbiologists received step by step instructions on how to run samples and standards and prepare reagents for all the lab instruments, and carried on lab preparations. The rest of the science party continued preparing Explanatory Notes and working in their labs. Scientists were introduced to the X-ray lab and three comprehensive tours of the ship's engine room, bridge, etc. were carried out to accommodate the schedule of all the scientists.


Daily Science Report for 12 July 2009

LOCATION: 50° 53.4' N, 140° 24.50' W, in transit to Site UMK-4D (U1339)

SCIENCE UPDATE: Expedition scientists were given an informal training in the software Kaleidagraph and a presentation on logging tools and capabilities. Later they continued their laboratory training and documentation of methods for the expedition activities and reports. Meetings to discuss the sampling strategy for geochemical and microbiological samples as well as a micropaleontological research projects and collaborations were held during the afternoon.


Daily Science Report for 11 July 2009

LOCATION: In transit to Site UMK-4D (U1339)

SCIENCE UPDATE: The Bering Sea expedition scientists started processing a training core recovered during the Equatorial Pacific Expedition 321. Core U1338D-1H was processed for physical properties (gamma ray attenuation, magnetic susceptibility, P-Wave velocity, resistivity, natural gamma radiation and thermal conductivity) using the whole round loggers. Then Core section U1338D-1H2 was split into working and archive halves to mimic the core flow routine and carry on core section processing throughout the ship laboratories. Discrete samples were taken for geochemical and micropaleontological analyses, thus providing all scientists with sediment material to continue training with their labs instrumentation and the new sampling and core description applications. In addition, scientists continued preparation of the explanatory notes and the sampling strategy for geochemical and microbiological samples. Downhole logging preparation activities included refining the software for analyzing the wireline heave compensation and logging data.


Daily Science Report for 10 July 2009

LOCATION: In transit to Site UMK-4D (U1339)

SCIENCE UPDATE: The JOIDES Resolution departed Victoria at 0700 hrs. The expedition participants enjoyed the scenic views and marine wildlife as the ship sailed through the Strait of Juan de Fuca in route to the Pacific Ocean and to our first site in the eastern Bering Sea. A fire drill was carried out in the mid-day and was followed by a science orientation meeting and sampling/core flow training sessions for the scientific party. Scientists continued preparation of the analytical methods explanatory notes.


Daily Science Report for 9 July 2009

LOCATION: Ogden Point South Pier A, Victoria, B.C. (Canada)

SCIENCE UPDATE: Scientists continued familiarization with their lab instrumentation, analytical methods, and preparation of the explanatory notes of the expedition's report. A meeting was held between the co-chiefs, microbiologists and geochemists to continue discussing sampling plans and protocols and prepare sampling templates. Scientists had the afternoon off in preparation for sailing away early Friday morning. LDEO continued testing and readying downhole logging capabilities. USIO staff continued moving oncoming and outgoing freight.


Daily Science Report for 8 July 2009

LOCATION: Ogden Point South Pier A, Victoria, B.C. (Canada)

SCIENCE UPDATE: Bering scientists continued shipboard orientation and planning for the expedition. Activities included introduction to sample concept, stratigraphic correlation, shipboard responsibilities and obligations, overall expedition reports and publications, and the captain's introduction and ship safety. Scientists continued familiarization with their laboratory instrumentation and preparation of the explanatory notes for the Expedition Reports. USIO staff received marine mammal identification training and continued moving oncoming and outgoing freight.


Daily Science Report for 7 July 2009

LOCATION: Ogden Point South Pier A, Victoria, B.C. (Canada)

SCIENCE UPDATE: Bering scientists and technical staff began shipboard orientation and planning for the expedition. Activities included personnel introductions, overview of the Bering Sea scientific objectives by co-chief scientists and the expedition operations plan. USIO technical staff provided orientation on information technology services (computers, servers, network, email, etc), lab safety and life on board. Sedimentologists and paleontologists received an introduction to the new descriptive information system. All scientists started orientation on their lab instrumentation, methods, and safety. Lab tours were conducted for entire science party. Ship tours for local universities and institutions continued throughout the day. USIO staff continue moving oncoming and outgoing freight.


Daily Science Report for 6 July 2009

LOCATION: Ogden Point South Pier A, Victoria, B.C. (Canada)

SCIENCE UPDATE: The expedition management team continued preparations for port call activities and introductory meetings for the incoming science party. USIO staff continued cross-over activities, including moving oncoming and outgoing freight and making modifications to the pallet stores. All scientists arrived throughout the day and were provided an initial orientation to the ship and the upcoming port call science activities.


Daily Science Report for 5 July 2009

LOCATION: Ogden Point South Pier A, Victoria, B.C. (Canada)

SCIENCE UPDATE: Bering Sea Expedition 323 co-chief scientists and USIO staff began cross over to learn new labs, instruments, software, systems, and procedures. The expedition management team began preparations for port call activities and introductory meetings for the incoming science party. All oncoming freight began to be loaded on board and stowed.




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