Magnetic properties of different grain-sized particles of sediments from the Okinawa Trough and their relationships to s

Multiple magnetic parameters were measured for nine different grain-sized fractions separated from the sediment samples that are representatives of four different sedimentary environments of the Okinawa Trough. Based on the measured results, the contributions of different grain-sized particles to total magnetic susceptibility of bulk sediments, the magnetic mineral assemblage and magnetic domain state as well as their relationships to sedimentary environment were discussed. Our research shows that the magnetic mineral is dominated by magnetite with a small amount of hematite and is primarily in pseudo-single-domain state. That indicates that the different sedimentary environments in the Okinawa Trough have certain correlation in material provenance. The magnetic minerals enrich in different grain-sized particles in response to different sedimentary environments. The contribution of the grain sizes from coarse to fine to coarse and fine to the magnetic susceptibility from the west to the east is in accordance with terrigenous material transportation from continental shelf of the East China Sea to the Okinawa Trough. It also shows difference in magnetic properties as a result of some environmental factors.

作 者： LI Ping LI Peiying Zhang Xiaolong CAO Chengxiao XU Xingyong DU Jun LIU Lejun   作者單位： LI Ping(Ocean University of China, Qingdao 266003, China;Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration (SOA), Qingdao 266061, China;First Institute of Oceanography, SOA, Qingdao 266061, China)

LI Peiying,DU Jun(First Institute of Oceanography, SOA, Qingdao 266061, China)

Zhang Xiaolong(Ocean University of China, Qingdao 266003, China;First Institute of Oceanography, SOA, Qingdao 266061, China)

CAO Chengxiao,XU Xingyong,LIU Lejun(Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration (SOA), Qingdao 266061, China;First Institute of Oceanography, SOA, Qingdao 266061, China) 

刊 名： 科學(xué)通報(bào)（英文版）  SCI 英文刊名： CHINESE SCIENCE BULLETIN  年，卷(期)： 2005 50(7)  分類號(hào)：   關(guān)鍵詞： Okinawa Trough   total magnetic susceptibility   grain- sized fractions   magnetic minerals   sedimentary environment  

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