The biogenic silica variation and paleoproductivity evolution in the eastern Indian Ocean during the past 20 000 a
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The biogenic silica variation and paleoproductivity evolution in the eastern Indian Ocean during the past 20 000 a Yonghang Xu1*, Liang Wang1, Zhikun Lai1, Xiaohui Xu1, Feng Wang1, Shengfa Liu2, 3, Xuefa Shi2, 3, Rainer Arief Troa4, Rina Zuraida5, Eko Triarso4, Marfasran Hendrizan6 1 Laboratory of Ocean and Coast Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen
361005, China 2 Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao
266237, China 3 Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of
Natural Resources, Qingdao 266061, China 4 Marine Research Center, Agency of Research and Human Resources for Marine and Fisheries, Jakarta 14420,
Indonesia 5 Marine Geological Institute, Agency for Research and Development for Energy and Mineral Resources, Bandung
40174, Indonesia 6 Research Center for Geotechnology, Indonesia Institute of Sciences, Bandung 40135, Indonesia
Received 27 October 2017; accepted 6 February 2018 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract
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. Key words: biogenic silica, paleoproductivity, Sunda Strait, eastern India Ocean Citation: Xu Yonghang, Wang Liang, Lai Zhikun, Xu Xiaohui, Wang Feng, Liu Shengfa, Shi Xuefa, Troa Rainer Arief, Zuraida Rina, Triarso Eko, Hendrizan Marfasran. 2019. The biogenic silica variation and paleoproductivity evolution in the eastern Indian Ocean during the past 20 000 a. Acta Oceanologica Sinica, 38(1): 78–84, doi: 10.1007/s13131-019-1372-z
1 Introduction Biogenic silica (BSi) which is mostly composed of siliceous plankton (such as diatom, radiolarian and sponge spicule remains), is a major biogenic component of marine sediments. Of these groups of siliceous plankton, diatoms account for the most BSi production. Diatoms are particularly in high-latitude areas and along some continental margins, especially
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