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对冲绳海槽4个沉积环境的代表性样品进行粒度分离,并测量了多个磁性参数.对所得结果就不同粒级的颗粒对磁化率的贡献,磁性矿物成分和粒度大小及其与环境的关系进行探讨,指出不同沉积环境磁性矿物均以磁铁矿为主,磁性矿物粒度以假单畴为主,在物源上表现出有一定的联系;不同沉积环境对磁性矿物富集的沉积物粒级不同,从陆架外缘、西陆坡到东、西槽底平原对磁化率贡献的粒级由粗到细再到粗细粒级均有贡献的变化规律,既符合陆源物质由东海陆架向冲绳海槽输入的趋势,又因受其他环境因素的影响,体现出不同的磁性特征.
Representative samples of the four sedimentary environments in the Okinawa Trough were subjected to particle size separation and magnetic parameters were measured and their contribution to the magnetic susceptibility of different size fractions, It is pointed out that the magnetic minerals in different sedimentary environments are dominated by magnetite. The size of magnetic minerals is dominated by pseudo-monodomain, and there is a certain relationship between the source rocks. Different sedimentary environments have great influence on the accumulation of magnetic minerals Different grain size, from the outer edge of the shelf, west slope to the east and west of the bottom of the plains contribute to the magnetic susceptibility of the grain size from coarse to fine and then to the coarse and fine levels have contributed to the variation of both terrestrial material from the East China Sea shelf to Okinawa The trend of trough input, but also due to other environmental factors, reflecting the different magnetic characteristics.