Neogene and Quaternary paleoceanographic changes in the southern South China Sea (Site 1143): the benthic foraminiferal record

Hess, S. and Kuhnt, W. (2005) Neogene and Quaternary paleoceanographic changes in the southern South China Sea (Site 1143): the benthic foraminiferal record Marine Micropaleontology, 54 (1-2). pp. 63-87. DOI 10.1016/j.marmicro.2004.09.004.

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Deep-sea benthic foraminiferal assemblages from Ocean Drilling Program (ODP) Site 1143 located in the southern South China Sea (SCS) were investigated to evaluate the relationship between faunal composition patterns and paleoceatiographic changes during the last 6 million years (late Miocene to Holocene). We used multivariate statistics (correspondence analysis) to analyze carbon-flux-related changes in assemblage composition of benthic foraminifers. Additional proxies for carbon flux and deep-water ventilation include delta(13)C records of epifaunal Cibicidoides wuellerstoifi and infaunal Uvgefina peregrina var. dirupta and Melonis pompilioides, benthic foraminiferal accumulation rates (BFARss), diversity indices, and relative abundances of indicator species. We observe three significant benthic faunal changes in the southern South China Sea during the last 6 million years. Strong fluctuations in BFAR and relative abundance of productivity indicator species between glacial and inter-glacial stages after the mid-Pleistocene revolution (MPR) at approximately 0.9 Ma, indicating stronger seasonal carbon flux fluctuations, are accompanied by the extinction of such species as Stilostomella spp. Increases in carbon flux indicator species are coupled with an overall deer-ease in benthic foraminifer diversity around 3.0 Ma in the late Pliocene. This may indicate increasing carbon flux in a period of productivity maximum caused by enhanced offshore upwelling from intensified winter monsoon wind strength. (C) 2004 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: ODP Site 1143 South China Sea benthic foraminifera paleoproductivity neosgene quaternary east-asian monsoon northern-hemisphere glaciation surface ocean productivity atlantic-ocean progressive intensification equatorial pacific late pleistocene late pliocene indian-ocean organic flux
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/j.marmicro.2004.09.004
ISSN: 0377-8398
Date Deposited: 18 Jan 2012 05:25
Last Modified: 08 Oct 2012 10:26

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