新疆东昆仑卡尔瓦西地区泥盆系布拉克巴什组下段火山岩地球化学特征及地质意义  

Geochemical features and geological significance of volcanic rocks in the lower member of Devonian Bulakebashi Formation in Kaerwaxi area,East Kunlun mountains of Xinjiang

作　　者：刘越[1] 詹天宇 LIU Yue;ZHAN Tian-yu(Institute of Geological Survey of Jilin Province,Changchun 130102,Jilin,China)

机构地区：[1]吉林省地质调查院,吉林长春130102

出　　处：《吉林地质》2020年第4期60-68,共9页Jilin Geology

基　　金：国大调基础地质调查项目(1212011120532)。

摘　　要：本文对研究区火山岩进行了岩石学描述和火山韵律分析。通过对该套火山岩进行常量元素、稀土元素和微量元素分析,确定了研究区泥盆系中统布拉克巴什组下段火山岩地球化学特征。并且,对构造环境进行了判别与分析,表明研究区构造环境为洋盆的重新扩张、洋陆转换及陆内叠覆造山,火山岩形成于板块汇聚俯冲碰撞的岛弧环境。Petrological description and volcanic rhythm analysis of volcanic rocks in the study area were carried out.Based on the analysis of major elements,rare earth elements and trace elements in the volcanic rocks,the geochemical features of the volcanic rocks in the lower part of the Devonian Bulakebashi Formation in the study area were determined.In addition,the tectonic environment is discriminated and analyzed,which indicates that the tectonic environment in the study area is reflected by the re-expansion of ocean basin,ocean-land conversion and intracontinental overlapping orogeny.The volcanic rocks were formed in the island arc environment of plate convergence,subduction and collision.

关 键 词：东昆仑 布拉克巴什组 火山岩 地球化学 

分 类 号：P588.14[天文地球—岩石学]