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Strontium and neodymium isotopic compositions of detrital sediment of NS90-103 from South China Sea: Variations and their paleoclimate implication

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Abstract

Strontium, neodymium isotopic compositions and trace elements of the detrital sediments of Core NS90-103 from South China Sea were analyzed. The results show that the87Sr/86Sr ratios of the detritus during the last glacial range from 0.722 4 to 0.723 0. They are significantly higher than those during the Holocene and the maximum of the last interglacial, which range from 0.721 0 to 0.721 7. This indicates stronger continental weathering during the last glacial. On the other hand, the143Nd/144Nd ratios of these detritus are higher during the last glacial too, similar to the variation of the87Sr/86Sr ratios. The trace element geochemistry of these detritus indicates that more authigenic sediments, such as ferromanganese, during the last glacial may partly contribute to the increase of143Nd/144Nd ratios. Furthermore, much more detritus from continent of South China to the north of the South China Sea may probably contribute to143Nd/144Nd ratios increase during the last glacial, which was the result of the enhancement of northeast monsoon.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China

    Gangjian Wei, Xuntang Gui, Xianhua Li, Yuwei Chen & Jinsheng Yu

  2. Department of Geology, National Taiwan University, Taibei, China

    Gangjian Wei

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  1. Gangjian Wei
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  2. Xuntang Gui
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  3. Xianhua Li
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  4. Yuwei Chen
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Wei, G., Gui, X., Li, X. et al. Strontium and neodymium isotopic compositions of detrital sediment of NS90-103 from South China Sea: Variations and their paleoclimate implication. Sci. China Ser. D-Earth Sci. 43, 596–604 (2000). https://doi.org/10.1007/BF02879503

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