东海内陆架陆源物质矿物组成对粒度和地球化学成分的制约  

Terrigenous Mineral Constrains on the Grain-Size Distribution and Geochemical Composition of Sediments in the Inner Shelf of the East China Sea

作　　者：徐方建[1,2] 李安春[1] 万世明[1,3] 刘建国[1] 徐兆凯[1] 肖尚斌[1] 王金丽[4] 

机构地区：[1]中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,山东青岛266071 [2]中国科学院研究生院,北京100049 [3]中国科学院地质与地球物理研究所,北京100029 [4]中国地质科学院地质研究所,国土资源部大陆动力学重点实验室,北京100037

出　　处：《地球科学（中国地质大学学报）》2009年第4期613-622,共10页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目(Nos.40576032;40776030;40706025)

摘　　要：通过对东海内陆架EC2005孔柱状沉积物陆源矿物、粒度及地球化学成分分析,尝试探讨三者之间的制约关系.该孔柱状沉积物主要矿物成分为粘土矿物、石英以及长石.石英和长石含量控制着平均粒径的大小.矿物含量与化学成分含量表现出较好的相关性,体现了矿物对地球化学成分的控制.沉积物中各种矿物颗粒的大小差别造成了沉积物粒度的差异,矿物间化学组分的不同是影响沉积物化学成分含量的主要因素,其往往通过粒度组成间接地表现出来,这就造成了"元素的粒度控制"表面现象,实质上是矿物的种类和含量对粒度和地球化学成分起控制作用.The grain-size distribution, geochemical compositions and terrigenous mineral components of sediments of Core EC2005 in the inner shelf of the East China Sea （ECS） are analyzed to probe into their possible inherent relationships. Terrige-nous components in Core EC2005 are dominated by clay minerals, quartz and feldspar. The variation of mean grain size of the downhole is mainly controlled by the quartz and feldspar content. The mineral components show good correlation to geochemical compositions, suggesting the mineral constrains on the chemical elements in the sediments. Our study shows that the grainsize and the geochemical composition of terrigenous mineral particles are the main factors that control the grain-size parameters and geochemical composition of sediments. The mineral constrains on the grain-size distribution and geochemical composition are crucial, whereas the grain-size distribution can only affect the geochemical composition via changes in mineral components.

关 键 词：矿物 粒度 地球化学成分 EC2005孔 东海内陆架 沉积学 

分 类 号：P588.2[天文地球—岩石学]