琼东南海域表层沉积物常量元素地球化学及其地质意义

对琼东南海域88个表层沉积物的常量元素进行了统计分析,结果表明:琼东南海域表层沉积物中含量最高的两种组分是SiO2和CaO,其平均含量分别为41.15%和15.66%;琼东南海域表层沉积物以陆源碎屑为主,同时生物沉积作用也较发育;陆源物质源区较复杂,主要的陆源物质可能由古红河水系携带而来;因子分析结果表明,该区表层沉积物的常量元素可分为4组,第1组包括SiO2、Al2O3、Fe2O3、MgO、K2O、TiO2,第2组包括CaO、CaCO3、烧失量,第3组包括P2O5和有机碳,第4组包括Na2O和MnO,分别代表了陆源碎屑沉积、钙质生物沉积、海洋化学沉积以及火山碎屑沉积。

GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF MAJOR ELEMENTS IN SURFACE SEDIMENTS IN QIONGDONGNAN AREA

Geochemical characteristics and geological significance of surface sediments from the Qiongdongnan area are studied.88 sediment samples have been analyzed for their major element contents.SiO2 is of the highest content in the area,with its mean content up to 41.15%.CaO following SiO2,its mean content is 15.66%.Terrestrial clasts in the area were mainly carried by Honghe River from Western Yunnan Plateau.Factor analysis shows that SiO2,Al2O3,Fe2O3,MgO,K2O and TiO2 originate from terrestrial source and CaO,CaCO3 and LOSS are mainly derived from marine calcicolous livings.Meanwhile,P2O5 and Corg mainly come from mixed terrestrial matrials and marine livings and Na2O and MnO are mostly products of marine chemistry or volcanism.However,the components of terrestrial clastic and biological materials are primary factors that control the chemical compositions of sediments in the study area.