The paleoenvironmental significance of magnetic susceptibility of sediments on the East China Sea inner shelf since the last deglaciation

XU Fang-jian; LI An-chun; LI Tie-gang; MENG Qing-yong; CHEN Shi-yue; LIN Cheng-yan; CAO Ying-chang

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Article Navigation > Haiyang Xuebao > 2011 > 33(1): 91-97

XU Fang-jian, LI An-chun, LI Tie-gang, MENG Qing-yong, CHEN Shi-yue, LIN Cheng-yan, CAO Ying-chang. The paleoenvironmental significance of magnetic susceptibility of sediments on the East China Sea inner shelf since the last deglaciation[J]. Haiyang Xuebao, 2011, 33(1): 91-97.

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The paleoenvironmental significance of magnetic susceptibility of sediments on the East China Sea inner shelf since the last deglaciation

1.
Faculty of Geo-resources and Information, China University of Petroleum(East China), Qingdao 266555, China;Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Key Laboratory of Shan
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.
Faculty of Geo-resources and Information, China University of Petroleum(East China), Qingdao 266555, China
4.
Faculty of Geo-resources and Information, China University of Petroleum(East China), Qingdao 266555, China;Key Laboratory of Shandong Province for Reservoir Geology, China University of Petroleum, Dongying 257061, China

Received Date: 2010-02-22

Abstract

Abstract

The paleoenvironmental significance of magnetic susceptibility (MS) and its influencing factors in the sediments on the inner shelf of the East China Sea have been discussed since the last deglaciation.On the basis of analysis on the MS, lithology, grain-size, major elements, minerals and AMS¹⁴C dating of Core EC2005 which is located in the mud depocenter near the Zhejiang-Fujian coast, main conclusions are summarized as follows. The variations of the MS are affected by many factors and the main influencing factors at different layers change significantly. The MS in core depth 60.20~28.06 m is controlled primarily by lithology, the variations in core depth 28.06~8.40 m are due to the impact of early diagenetic effects on magnetic minerals, and the MS above 8.40 m is likely to be affected by human activities. The decrease of the MS at the bottom of 60.20~41.00 m corresponds to the climate warming and wetting trend, lake expansion that occurred during this period. This view is inconsistent with the previous studies that the high MS value corresponds to the warm and humid climate conditions. It is indicated climatic significance differs in different study areas. Therefore, caution must be exercised when the MS is adopted as climate proxies. Its significance should be discussed in detail.
- inner shelf of the East China Sea,
- last deglaciation,
- magnetic susceptibility,
- sedimentary environment,
- diagenesis

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