恩施州双河地区二叠系孤峰组微量元素特征

Trace Element Characteristics of Gufeng Formation of Permian in Shuanghe area,Enshi Autonomous Prefecture

二叠系孤峰组在恩施双河地区广泛出露,为一套黑色炭质硅质岩建造,富含Se、V、Mo等元素。通过对双河地区白街、渔塘坝、白岩溪三地样品采集,分析孤峰组微量元素含量。本区稀土总量含量较低,稀土元素的地球化学特征指示沉积环境为大陆边缘还原环境。孤峰组重金属Cd、Sb含量较高,硒矿层重金属As、Cr含量较高,Cd则含量低。Se与As关系最为密切,As、Sb、Hg、Mo、V地化异常找Se具指示意义。

Gufeng Formation of Permian is widely exposed in Shuanghe area,a set of black carbonaceous siliceous which is rich in Se,V,Mo and other elements. Through the acquisition of samples of Baijie,Yutangba and Baiyanxi in Shuanghe area,the paper analyses trace elements content. The total content of rare earth elements in this area is relatively low,geochemical characteristics of rare earth elements indicates sedimentary environment is reducing environment of continental margin. Se and As is most closely related,geochemical anomalies of As,Sb,Hg,Mo,V have indicative significance for finding Se.