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The biogenic silica variation and paleoproductivity evolution in the eastern Indian Ocean during the past 20 000 a

Acta Oceanologica Sinica 2019年第1期38卷 78-84页

作者： Yonghang Xu Liang Wang Zhikun Lai Xiaohui Xu Feng Wang Shengfa Liu Xuefa Shi rainer arief troa Rina Zuraida Eko Triarso Marfasran Hendrizan Laboratory of Ocean and Coast Geology Third Institute of Oceanography Ministry of Natural Resources Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology (Qingdao) Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography Ministry of Natural Resources Marine Research Center Agency of Research and Human Resources for Marine and Fisheries Marine Geological Institute Agency for Research and Development for Energy and Mineral Resources Research Center for Geotechnology Indonesia Institute of Sciences

The biogenic silica of sediment samples from Core CJ01-185 which is collected from the eastern India Ocean off the Sunda Strait is analyzed to evaluate the impact of the opening of the Sunda Strait on a paleoproductivity evolution. The new results indicate that the biogenic silica mass values of Core CJ01-185 show the lowest 0.86% in the last glacial period, and reach its maxima of 1.89% in the late Holocene. Furthermore, the biogenic silica mass accumulation rate(MARBSi) values also vary with much higher during the late Holocene than during the last glaciation. The input of additional terrigenous materials from the Java Sea has enhanced the paleoproductivity and increased the biogenic silica mass and MARBSi values after the opening of the Sunda Strait. It is suggested that the paleoproductivity in the study area is mainly influenced by the southeast monsoon and upwelling before the opening of the Sunda Strait. However, the paleoproductivity is dominated by the terrigenous materials input other than by the southeast monsoon or upwelling in the Holocene.

关键词： biogenic silica paleoproductivity Sunda Strait eastern India Ocean

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