新疆额敏丘巴尔博哈蛇绿构造混杂岩的发现及其地质意义  

The Discovery And Geological Significance Of Ophiolite Tectonic Mélange In Qiuerbaboha Of E’min,Xinjiang

作　　者：王小朗 高福平 李麟 王旭斌 郝欢 赵文平 Wang Xiaoang;Gao Fuping;Li Lin;Wang Xubin;Hao Huan;Zhao Wenping(Shaanxi Geology and Mining Group Co.,LTD.Xi’an 710054;Shaanxi Hanzhong Geological Brigade Co.,LTD.,Hanzhong723000;Shaanxi Mining Industry and Trade Co.,LTD.Xi’an)

机构地区：[1]陕西地矿集团有限公司,陕西西安710054 [2]陕西地矿汉中地质大队有限公司,陕西汉中723000 [3]陕西矿业开发工贸有限公司,陕西西安710054

出　　处：《陕西地质》2023年第1期4-13,共10页Geology of Shaanxi

基　　金：新疆维吾尔自治区2016年度中央返还两权价款资金项目,项目编号:A16-1-LQ10.

摘　　要：在额敏北部开展地质调查工作中,识别出一条蛇绿混杂岩带,该蛇绿混杂岩带位于新疆额敏县北东丘巴尔博哈一带,东西长约16km,南北宽约2km,呈透镜状。具有蛇绿岩典型的“五位一体”特征,由橄榄岩(蛇纹岩)、堆晶辉石岩、辉长岩、辉绿岩以及枕状玄武岩、放射虫硅质岩等岩块组成,基质为玄武安山岩、安山岩以及混入的石英岩、大理岩等外来杂岩体。蛇绿混杂岩中辉绿岩的LA-ICP-MS锆石U-Pb测年结果为489.4±4.2 Ma,代表了蛇绿混杂岩的形成时代为早古生代。蛇绿混杂岩中不同组分的稀土元素及微量元素特征,显示可能形成于一多岛弧盆体系的构造环境。丘巴尔博哈蛇绿混杂岩的发现对西准噶尔构造演化提供了重要的地质依据。An ophiolite melange zone in the Qiuerbaboha area was identified during the geological survey carried out in the northeast of E’min County,Xinjiang,which is about 16km long from east to west and 2km wide from north to south,and is lens-shaped with the typical“five-in-one-body”characteristic,mainly composed by peridotite,serpentinite,crystal pyroxenite,gabbro,diabase,pillow basalts,radiolarian silicite and other rock blocks.LA-ICP-MS zircon U-Pb dating of diabase in the ophiolite mélange is 489.4±4.2 Ma,indicating that the ophiolite was formed in the early Paleozoic and the Ree and micronutrient characteristics of different components in the ophiolite melange indicate that it was probably formed in a tectonic setting of a multi-island arc-basin system.The discovery of ophiolite melange in Qiubaerboha provides an important geological basis for the tectonic evolution of Western Junggar.

关 键 词：新疆 丘巴尔博哈 锆石U-PB定年 蛇绿构造混杂岩 地质意义 

分 类 号：P548[天文地球—构造地质学] P588[天文地球—地质学]