Benthic foraminiferal fauna turnover at 2.1 Ma in the northern South China Sea

Quantitative analysis of benthic foraminifera from ODP Site 1146 in the northern South China Sea (SCS) shows that abundance of Bulimina alazanensis, sometimes up to about 90%, decreased gradually since 3.2 Ma, especially at 2.1 Ma. Abundance of other benthic foraminiferal species, Globobulimina subg...

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Bibliographic Details
Published in:Chinese Science Bulletin
Main Authors: Huang BaoQi, Jian ZhiMin, Wang PinXian
Other Authors: Huang, BQ (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: 科学通报 英文版 2007
Subjects:
paleoceanography
benthic foraminifer Bulimina alazanensis
Late Pliocene
northern South China Sea
ORGANIC-CARBON FLUX
PALEOCEANOGRAPHIC CHANGES
ARABIAN SEA
OXYGEN
PRODUCTIVITY
PLEISTOCENE
EVOLUTION
PLIOCENE
NEOGENE
CLIMATE
Pacific
Planktonic foraminifera
Online Access:https://hdl.handle.net/20.500.11897/156039
https://doi.org/10.1007/s11434-007-0114-3
Description
Summary:Quantitative analysis of benthic foraminifera from ODP Site 1146 in the northern South China Sea (SCS) shows that abundance of Bulimina alazanensis, sometimes up to about 90%, decreased gradually since 3.2 Ma, especially at 2.1 Ma. Abundance of other benthic foraminiferal species, Globobulimina subglobosa and Cibicidoides wuellerstorfi, increased after 2.1 Ma. Comparison with changes in oxygen and carbon isotopes of planktonic and benthic foraminifera shows that high abundance values of B. alazanensis corresponded with lower values of oxygen isotope, but for carbon isotope, high values of the species were consistent with heavier carbon isotope of benthic foraminifera and lighter carbon isotope of planktonic foraminifera, respectively, and vice versa. Considering factors such as uplift of Bashi Strait, expansion of the North Hemisphere Glaciation, strengthening of East Asian winter monsoon and variations in oxygen and carbon isotope of foraminifera, changes of B. alazanensis in ODP Site 1146 suggest that the source of deep water masses of the northern South China Sea changed from the warm Pacific deep water with high oxygen content to Pacific Intermediate water with low oxygen content at 2.1 Ma. In addition, the strengthened East Asian winter monsoon resulted in increased primary productivity, high nutrient and suboxic bottom water. Variations in species of B. alazanensis seemed to be unable to tolerate environmental stress induced by deep water masses and productivity changes. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000246677400017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Multidisciplinary Sciences SCI(E) 4 ARTICLE 6 839-843 52

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