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本文通过对南海中部112个沉积物样品中的22种元素地球化学的研究,认为:(1)主要元素Si(包括自生硅)、Al、Ca、Mg、Fe、Mn、Ti、Na、K等,基本上受沉积物类型的控制,陆坡碳酸盐和深海粘土两大类型的沉积物,其矿物组分的差异和相对数量决定了各主要元素的分布;(2)以陆源碎屑成因为主的深海粘土类较有利于微量元素的富集,但微量元素含量与典型大洋沉积物相比,表现出地区差异性。文中通过对各微量元素的相关性、赋存状态以及共生组合分析,提出Ni、Cu、Zn、Co、Pb等重金属元素部分通过铁锰胶体粒吸附,部分通过粘土矿物吸附而富集;B、Ti、Zr、Cr、V主要为粘土吸附;Sr与Ca同属生物成因聚集;Ba除与生物作用有关外,尚与Cu、Pb、Ag共生并与海底火山活动密切相关;(3)有机碳和氮含量除与生物量有关外,它们与沉积物粒度和氧化还原环境的关系不明显。
Based on the study of 22 elements geochemistry in 112 sediment samples in the central South China Sea, it is considered that: (1) The major elements Si (including authigenic silicon), Al, Ca, Mg, Fe, Mn, Ti, Na, K etc. , Which are basically controlled by the type of sediment. The sediments of both continental slope carbonate and deep-sea clay have different mineral composition and their relative quantities, which determine the distribution of major elements. (2) The main deep-sea clay is more conducive to the enrichment of trace elements, but the trace element content shows regional differences compared with the typical ocean sediments. In this paper, some heavy metal elements such as Ni, Cu, Zn, Co and Pb are adsorbed by ferromanganese colloidal particles and partially enriched by adsorption of clay minerals through the correlations, occurrences and symbiosis analysis of trace elements. Ti, Zr, Cr and V are mainly adsorbed on clay; Sr and Ca are both biogenic aggregates; Ba is closely related to Cu, Pb, Ag and submarine volcanic activity besides its biological role; (3) In addition to biomass related to nitrogen content, their relationship with sediment grain size and redox environment is not obvious.