冲绳海槽分级沉积物的地球化学特征

THE GEOCHEMICAL CHARACTERISTICS OF THE FRACTIONAL SEDIMENTS FROM THE OKINAWA TROUGH

通过对冲绳海槽中段表层沉积物样品的分级测试，总结出不同粒级沉积物中元素的含量和赋存形式特征。粗粒级（＞63μm）中以陆源碎屑矿物和碎屑矿物晶格中类质同象元素赋存，细粒级（＜63μm）中粘土矿物及其吸附作用对常量、微量和稀土元素的富集有重要影响。

Based on the analysis of 9 surficial samples unequigranular data, differentconcentrations and forms of major, minor, and rare elements in the fractiollalsediments are cbtained: in coarse fractional sediments (>63μm), the elementsexist as forms of terrigenous clastic mineral or of replacement in crystal latticeelements. However, the concentrations of major, minor and rare elements are grea-tly affected by clay mineral and adsorption in fine fractional sediments(<63μm).