Oxygen isotope stratigraphy and events in the northern South China Sea during the last 6 million years |
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Authors: | JIAN Zhimin CHENG Xinrong ZHAO Quanhong Wang Jiliang WANG Pin×ian |
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Institution: | Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China |
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Abstract: | Based on the stable isotopic analysis of more than 1000 samples of planktonic and benthic foraminifers from ODP Site 1148
in the northern South China Sea (SCS), the oxygen isotope stratigraphy has been applied to the last 3 million years for the
first time in the SCS. Furthermore, the paleoceanographic changes in the northern SCS during the last 6 million years have
been unraveled. The benthic foraminiferal δ18O record shows that before δ3.1 Ma the SCS was much more influenced by the warm intermediate water of the Pacific. The remarkable
decrease in the deepwater temperature of the SCS during the period of 3.1-2.5 Ma demonstrates the formation of the Northern
Hemisphere ice-sheet. However, the several sea surface temperature (SST) reductions during the early and middle Pliocene,
reflected by the planktonic foraminiferal δ18O, might be related to the ice-sheet growth in the Antarctic region. Only those stepwise and irreversible SST reductions during
the period of δ2.2-0.9 Ma could be related to the formation and growth of the Northern Hemisphere ice-sheet. |
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Keywords: | oxygen isotope stratigraphy Pliocene-Pleistocene Northern Hemisphere glaciation middle Pleistocene revolution South China Sea |
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