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Evolution of planktonic foraminifera and thermocline in the southern South China Sea since 12 Ma (ODP-184, Site 1143)

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Abstract

Down-core variation in planktonic foraminifera (PF) at Site 1143 (ODP 184) has disclosed the evolution of upper water-column structure over the last 12 Ma in the southern South China Sea. In the early Late Miocene (∽10.6–7.8 Ma), there existed a lower percentage of total deep-dwelling species, reflecting a water thermocline deeper than that in the Middle Miocene, which resulted from the closure of Indonesian seaway and relevant intensification of the equatorial warm current. After the increase in deep-dwelling PF and the rising of thermocline during the late Late Miocene (7.6–6.4 Ma), the total deep-dwelling species decreased gradually from late Late Miocene (6.4 Ma) to the Pliocene, implying the deepening of water thermocline. The evolution of thermocline depth in the southern South China Sea reflected by the PF at Site 1143 might be a good indicator of the change of west Pacific “warm pool”.

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Authors and Affiliations

  1. Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, 210008, Nanjing, China

    Baohua Li

  2. Key Laboratory of Marine Geology, Ministry of Education, Tongji University, 200092, Shanghai, China

    Baohua Li & Zhimin Jian

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  1. Baohua Li
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  2. Zhimin Jian
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Correspondence to Baohua Li.

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Li, B., Jian, Z. Evolution of planktonic foraminifera and thermocline in the southern South China Sea since 12 Ma (ODP-184, Site 1143). Sci. China Ser. D-Earth Sci. 44, 889–896 (2001). https://doi.org/10.1007/BF02907080

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  • DOI: https://doi.org/10.1007/BF02907080

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