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Abyssal benthic foraminifera in the eastern equatorial Pacific (IODP EXP 320) during the middle Eocene

Published online by Cambridge University Press:  14 July 2015

Hiroyuki Takata ,
Ritsuo Nomura ,
Akira Tsujimoto ,
Boo-Keun Khim  and
Ik Kyo Chung
Hiroyuki Takata
Affiliation:
Marine Research Institute, Pusan National University, San 30 Jangjeon-dong, Busan 609–735, Korea, Research Center for Coastal Lagoon Environments, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan,
Ritsuo Nomura
Affiliation:
Faculty of Education, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan, ;
Akira Tsujimoto
Affiliation:
Faculty of Education, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan, ;
Boo-Keun Khim
Affiliation:
Department of Oceanography, Pusan National University, San 30 Jangjeon-dong, Busan 609–735, Korea, ;
Ik Kyo Chung
Affiliation:
Department of Oceanography, Pusan National University, San 30 Jangjeon-dong, Busan 609–735, Korea, ;
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Abstract

We report on the faunal transition of benthic foraminifera during the middle Eocene at Site U1333 (4862 m water depth, 3,560–3,720 m paleo-water depth) of Integrated Ocean Drilling Program Expedition 320 in the eastern equatorial Pacific Ocean. During the period ∼41.5–40.7 Ma, which includes carbonate accumulation event 3 (CAE-3), the benthic foraminiferal accumulation rate (BFAR) increased gradually and then it declined rapidly. In contrast, BFAR was considerably lower during ∼40.7–39.4 Ma, corresponding to the middle Eocene climatic optimum (MECO), and then it increased during ∼39.3–38.4 Ma, including CAE-4. Diversity (E [S200]) was slightly lower in the upper part of the study interval than in the lower part. The most common benthic foraminifera were Nuttallides truempyi, Oridorsalis umbonatus, and Gyroidinoides spp. in association with Globocassidulina globosa and Cibicidoides grimsdalei during the period studied. Quadrimorphina profunda occurred abundantly with N. truempyi, O. umbonatus, and G. globosa during ∼39.4–38.4 Ma, including CAE-4, although this species was also relatively common in the lower part of the study interval. Virgulinopsis navarroanus and Fursenkoina sp. A, morphologically infaunal taxa, were common during ∼38.8–38.4 Ma, corresponding to the late stage of CAE-4. Based on Q-mode cluster analysis, four sample clusters were recognized and their stratigraphic distributions were generally discriminated in the lower and upper parts of the study interval. Thus, there was only a small faunal transition in the abyssal eastern equatorial Pacific during the middle to late-middle Eocene. The faunal transition recognized in this study may be related to recovery processes following intense carbonate corrosiveness in the eastern equatorial Pacific during MECO.

Type
Research Article
Information
Journal of Paleontology , Volume 87 , Issue 6 , November 2013 , pp. 1160 - 1185
Copyright
Copyright © The Paleontological Society 

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