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对南沙海域西南海区101个站位表层沉积物中的元素含量及分布特征分析表明:①元素含量的分布规律是Al、Fe、Mg、Ti、P、K、Na及Cu、Co、Ni、Pb、Zn、Ba、Zr含量从陆架到陆坡直到深海明显递增;Ca、Sr含量由陆架到陆坡递增,由陆坡向深海锐减;Si含量在陆坡低,在陆架和深海高。②沉积物中元素的分布和含量变化与沉积物类型有密切关系粗粒沉积物中Si、Sr含量较高,细粒沉积物则相对富集Al、Fe、Mg、Ti、P、K、Na及Cu、Co、Ni、Pb、Zn、Ba、Zr等元素,并且随沉积物变细,其含量亦增加,在粘土中含量最高。③SiO_2与其余常量组分均呈负相关,且随水深的增加,含量逐渐减少,Al、Fe与大多数常、微量元素(Si、Ca、Sr除外)呈正相关,Ca、Sr与大多数元素呈负相关,而它们本身呈强正相关。Co、Ni、Zn、Ba、Zr与Cu呈正相关,表现为亲铜性。④本区元素的分布主要受沉积物类型、物质来源、水深和生物生产力的影响。
The elemental contents and distribution characteristics of surface sediments in 101 stations in the southwestern sea area of Nansha sea area show that the distribution of elemental contents is Al, Fe, Mg, Ti, P, K, Na and Cu, Co, Ni, Pb The contents of Zn, Ba and Zr increase obviously from the shelf to the slope until the deep sea. The contents of Ca and Sr increase from the continental shelf to the continental slope, and decrease sharply from the slope to the deep sea. The Si content is low in the continental slope and high in the shelf and deep sea. ② The distribution and content of elements in the sediments are closely related to the sediment types. The content of Si and Sr in the coarse sediments is relatively high while the fine sediments are relatively rich in Al, Fe, Mg, Ti, P, K, Na And Cu, Co, Ni, Pb, Zn, Ba, Zr and other elements, and with the sediment thinning, its content is also increased, the highest content in the clay. ③SiO2 is negatively correlated with the other constants, and decreases gradually with the increase of water depth. Al, Fe is positively correlated with most of the normal and trace elements (except Si, Ca and Sr), and Ca, Sr and most of the elements Negative correlations, which themselves are strongly correlated. Co, Ni, Zn, Ba, Zr and Cu showed a positive correlation, showing copper affinity. ④ The distribution of elements in this area is mainly affected by sediment types, material sources, water depth and biological productivity.