新疆东准噶尔地区洋板块地质特征及构造演化  

Geological Characteristics and Tectonic Evolution of the Oceanic Plate in Eastern Junggar,Xinjiang

作　　者：赵同阳 朱志新 刘阁 李平 Zhao Tongyang;Zhu Zhixin;Liu Ge;Li Ping(Xinjiang Institute of geological survey,Urumqi,Xinjiang,830000,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000

出　　处：《新疆地质》2017年第4期380-391,共12页Xinjiang Geology

基　　金：新疆区域地质调查片区总结与服务产品开发(DD20160345-04);新疆矿产资源调查成果综合集成与服务产品开发(DD20160346)共同资助

摘　　要：首次运用洋板块地质学理论对东准噶尔出露的3条(蛇绿)混杂岩带:库尔提-玛因鄂博混杂岩带、扎河坝-阿尔曼太蛇绿混杂岩带和卡拉麦里蛇绿混杂岩带的物质组成及构造特征进行梳理,结合带内玄武岩岩石地球化学分析,发现区内存在大量MORE-Like型富铌、高镁玄武岩。认为卡拉麦里洋、额尔齐斯洋的消减起始于洋内俯冲,(蛇绿)混杂岩带内的玄武岩类可能形成于多种构造环境(洋内弧、前弧、陆缘弧、洋中脊、板内等),由于后期构造混杂堆积形成如今格架。The article applies the thought of oceanic plate geology for the first time summarize and sort out material composition and structural characteristics of three ophiolitic melange belts,including Korti-Mayinebo melange belt,Armantai-zhaheba ophiolitic melange belt and Kalamaili ophiolitic melange belt;In combination with rock geochemical analysis of basalt,found that there are a large number of MORE-Like,Nb rich and high Mg basalt in this study area;We consider that the Kalamaili ocean belt and Erqis ocean belt both starting from the ocean in the subduction;the basalt of the ophiolitic melange belts may be formed in a variety of tectonic environments(intra oceanic arc,frontal arc,continental marginal arc,mid-oceanic ridges,intraplate,etc.),because of the late tectonic melange,the present framework appears.

关 键 词：东准噶尔 洋板块地质学 蛇绿混杂岩带 玄武岩 

分 类 号：P542[天文地球—构造地质学]