Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (3): 298-309. doi: 10.11867/j.issn.1001-8166.2016.03.0298.

Special Issue: IODP

• Orginal Article • Previous Articles     Next Articles

Grain-Size Distribution of Detrital Sediment in the Amami Sankaku Basin Since Late Pleistocene and Its Provenance and Palaeoclimate Implications

Ye Zhou 1, 3( ), Fuqing Jiang 1, 2, *( ), Qingyun Nan 1, 2, Huahua Liu 1, 3, Anchun Li 1   

  1. 1.Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
    2.Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China
    3.University of Chinese Academy of Sciences, Beijing 100049,China
  • Received:2016-02-10 Revised:2016-03-01 Online:2016-03-20 Published:2016-03-10
  • Contact: Fuqing Jiang E-mail:zhouye066@163.com;fqjiang@qdio.ac.cn
  • About author:

    First author:Zhou Ye(1992-), female,Jiujiang City,Jiangxi Province,Master student.Research area include marine sedimentology.E-mail:zhouye066@163.com

    Corresponding author:Jiang Fuqing(1972-), male, Hutubi County, Xinjiang Province, Associate Professor. Research area include marine sedimentology.E-mail:fqjiang@qdio.ac.cn

  • Supported by:
    Project supported by the National Natural Science Foundation of China “Eolian dust record in the Amami Sankaku Basin and its indication of tectonic time-scale paleoclimate of East Asia since Miocene”(No.41576050);The State Oceanic Administration “Research on the Plaeoclimate of western Pacific” in the Project “Global Change and air-sea interaction” (No.GASI-04-01-02)

Ye Zhou, Fuqing Jiang, Qingyun Nan, Huahua Liu, Anchun Li. Grain-Size Distribution of Detrital Sediment in the Amami Sankaku Basin Since Late Pleistocene and Its Provenance and Palaeoclimate Implications[J]. Advances in Earth Science, 2016, 31(3): 298-309.

The grain size composition of detrital sediments in Hole U1438A from the Amami Sankaku Basin(ASB) in the northwest of the Philippine Sea since the last 350 ka was analyzed. The result shows that the mean grain size of the detrital sediment is about 13.1 μm, ranging from 0.04 to 160 μm. The grain size distribution displays a four-peak pattern and positive skewness. Four independent grain size components were separated by using Weibull distribution function. The ultra-fine component varies from 0.04 to 0.9 μm, with a size mode at about 0.3 μm, which may be genetically related to marine authigenetic clay. The fine-grained fraction ranges from 0.2 to 32 μm, with a size mode at about 3.5 μm, and slightly coarser than the eolian dust of the North Pacific. We argued that this fraction was mainly derived from Asian dust. The coarse-grained and ultra-coarse-grained fractions show distinct size mode at about 10 μm and 40 μm, and range from 0.3 to 90 μm, and from 3 to 160 μm respectively. Both the coarse and ultra-coarse components represent volcanic materials which were mainly derived from the ridges and islands around ASB. The variation of the ratio of environmentally sensitive size population 1.3~2.2 μm/28~40 μm was similar with the ratio of fine-sized component (Asian dust) and coarse-sized component (volcanic material) (0.9~3 μm/>10 μm), showing higher value during glacial period than that during interglacial, which is also identical with the variation of the mass accumulation of eolian dust in the North Pacific and Chinese Loess Plateau, and grain size in Chinese Loess Plateau. The increased ratio responded to the enhanced aridity of Asian continent and strengthened East Asia Winter Monsoon (EAWM)/westerly during glacial period. We argued that the increase of eolian fraction was driven by the enhanced aridity of Asian continent and strengthened East Asia Winter Monsoon (EAWM)/westerly during glacial period. Therefore, the ratio of 0.9~3 μm/>10 μm can be used as a proxy of the increased aridity and enhanced atmospheric circulation of Asian continent. These results suggest that the grain size composition of the detrial sediment in the ASB can be used to reconstruct the history of Asian aridity and atmospheric circulation.

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