Integrated Ocean Drilling Program Expedition 320 preliminary report; Pacific Equatorial Age Transect; 5 March-4 May 2009

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doi: 10.2204/iodp.pr.320.2009
Author(s): 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
Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX
Author Affiliation(s): Primary:
National Oceanography Centre-Southampton, School of Ocean and Earth Science, Southampton, United Kingdom
Other:
Hokkaido University, Japan
Integrated Ocean Drilling Program, United States
Universita "G. d'Annunzio" Chieti e Pescara, Italy
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 Münster, 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, United States
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.320, 175p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423
Note: In English. 91 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 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.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 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
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
Record ID: 2009068408
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