Integrated Ocean Drilling Program Expedition 321 preliminary report; Pacific Equatorial Age Transect; 4 May-22 June 2009

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doi: 10.2204/iodp.pr.321.2009
Author(s): 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
Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX
Author Affiliation(s): Primary:
Texas A&M University, Department of Oceanography, College Station, TX, United States
Other:
Universita "G. D'Annunzio", Italy
Integrated Ocean Drilling Program, United States
National Oceanography Centre-Southampton, United Kingdom
Hokkaido University, Japan
Lamont-Doherty Earth Observatory, United States
University of California-Davis, United States
University College London, United Kingdom
University of California-Santa Cruz, United States
University of Leicester, United Kingdom
Westfälische Wilhelms-Universität Munster, Federal Republic of Germany
Goethe University of Frankfurt, Federal Republic of Germany
Korea Ocean Research and Development Institute, South Korea
Japan Agency for Marine-Earth Science and Technology, Japan
Rice University, United States
University of Michigan, United States
University of Otago, New Zealand
University of Louisiana, United States
University of Rhode Island, United States
University of South Carolina, United States
Shimane University, Japan
University of Bremen, Federal Republic of Germany
Kochi University, Japan
Stockholm University, Sweden
Université Pierre et Marie Curie, France
University of New Orleans, France
University of Florida, United States
National Institute of Oceanography, India
University of Tokyo, Japan
Christian-Albrechts-Universität zu Kiel, Federal Republic of Germany
Indiana University of Pennsylvania, United States
Ibaraki University, Japan
Tohoku University, Japan
Universidad de Granada, Spain
Pennsylvania State University, United States
Utrecht University, Netherlands
Tongji University, China
Osaka City University, Japan
University of Hawaii at Manoa, United States
AIST/Geological Survey of Japan, Japan
Source: Preliminary Report (Integrated Ocean Drilling Program), Vol.321, 112p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423
Note: In English. 92 refs.
Summary: 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.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 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
Coordinates: N023028 N035000 W1175810 W1231223
Record ID: 2009098180
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