Data report; Early to middle Eocene benthic foraminifers at Sites U1331 and U1333, equatorial Central Pacific Ocean, Expedition 320/321

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doi: 10.2204/iodp.proc.320321.212.2013
Author(s): Nomura, Ritsuo; Takata, Hiroyuki; Tsujimoto, Akira
Integrated Ocean Drilling Program, Expedition 320 Scientists, College Station, TX
Author Affiliation(s): Primary:
Shimane University, Matsue, Japan
Hokkaido University, Japan
Integrated Ocean Drilling Program, United States
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, Germany
Goethe University of Frankfurt, 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, Germany
Kochi University, Japan
Universita "G. D'Annunzio", Italy
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, 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, Manoa, United States
Geological Survey of Japan, Japan
Pusan National University, South Korea
Volume Title: 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
Volume Author(s): Palike, Heiko; Nishi, Hiroshi; Klaus, Adam; Evans, Helen; Williams, Trevor; Acton, Gary D.; Bown, Paul R.; Delaney, Margaret; Dunkley Jones, Tom; Edgar, Kirsty; Fitch, Peter; Gussone, Nikolaus; Herrie, 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
Source: 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 R. Bown, Margaret Delaney, Tom Dunkley Jones, Kirsty Edgar, Peter Fitch, Nikolaus Gussone, Jens Herrie, 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, Jun Tian, Akira Tsujimoto, Bridget Wade, Roy 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, Vol.320/321, 22p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 25 refs.; illus., incl. 9 plates, 3 tables, sketch map
Summary: Benthic foraminiferal assemblages were studied in 44 samples from lower and middle Eocene sediments in Integrated Ocean Drilling Program (IODP) Expedition 320 Holes U1331C, U1333A, and U1333B. The benthic foraminifers from Hole U1331C were sampled in lower Eocene calcareous nannofossil Zones NP12/NP13 and radiolarian Zones RP8/RP9, and thus fall within the early Eocene climatic optimum and those from Holes U1333A and U1333B fall in the upper lower Eocene and lower middle Eocene calcareous nannofossil Zones NP15-NP17 and radiolarian Zones RP13-RP16. The benthic foraminiferal assemblages from Hole U1331C are poorly preserved, so the paleoceanographic response of the benthic assemblage to warming could not be clearly observed. The diversity of benthic assemblages in the middle Eocene is positively correlated with the carbonate content of the samples. The species Globocassidulina globosa, which has been argued to be an opportunistic species, occurred in the high-carbonate intervals. Diversities decreased coeval with an increase in abundance of radiolarians, occurring between Sections 320-U1333A-16X-5 and 16X-6, at the time of deposition of the marked carbonate poor horizon in the middle Eocene.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Benthic taxa; Biostratigraphy; Biozones; Cenozoic; Central Pacific; Cores; Depositional environment; East Pacific; Eocene; Equatorial Pacific; Expedition 320; Expeditions 320/321; Foraminifera; IODP Site U1331; IODP Site U1333; Integrated Ocean Drilling Program; Invertebrata; Lithofacies; Microfossils; North Pacific; Northeast Pacific; Pacific Ocean; Paleoecology; Paleogene; Protista; Tertiary
Coordinates: N120405 N120405 W1420942 W1420942
N103100 N103100 W1382510 W1382510
Record ID: 2015119922
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