新疆东昆仑雁头山—屏障岭一带蛇绿混杂岩带地质特征及其成因分析  

Geological Characteristics and Genesis Analysis of Ophiolitic Melange Belt in Yantoushan-Pingzhangling Area of East Kunlun,Xinjiang

作　　者：鲁浩 刘欢[1,2] 万鹏 LU Hao;LIU Huan;WAN Peng(Shandong No.3 Exploration Institute of Geology and Mineral Resources, Yantai 264000, Shandong,China;School of Earth Science and Resources, Chang’an University, Xi'an 710054, Shaanxi, China)

机构地区：[1]山东省第三地质矿产勘查院,山东烟台264000 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《西北地质》2021年第4期1-15,共15页Northwestern Geology

基　　金：新疆地勘基金中心“新疆若羌县大沙沟一带1∶5万(J45E019019、J45E020018、J45E020019、J45E021018、J45E021019)区域地质矿产调查”(XB-DK-2015-1-05);“新疆东昆仑三岔顶一带1∶5万四幅区域地质矿产调查”(K16-1-LQ22)。

摘　　要：新疆东昆仑木孜塔格地区出露多条蛇绿岩混杂岩带,雁头山屏障岭蛇绿混杂岩带出露于木孜塔格峰北东约100 km处。通过对雁头山屏障岭蛇绿混杂岩带含放射虫硅质岩的研究,确定其时代为晚泥盆世—早石炭世;结合混杂岩带地质特征、岩石地球化学特征,判断雁头山屏障岭蛇绿混杂岩带的形成环境为具有弧后盆地性质的小洋盆环境。在一定程度上可以将其归属为木孜塔格北蛇绿混杂岩带,其与西侧苏巴什及东侧阿尼玛卿等地残存的蛇绿岩共同组成康西瓦木孜塔格阿尼玛卿构造带,相当于青藏高原第四缝合带。Several ophiolite melange belts have been found in Muztag area of East Kunlun,Xinjiang,and Yantoushan-Pingzhangling ophiolitic melange belt is about 100 km northeast of Muztag peak.Based on the study of radiolarian siliceous rocks in Yantoushan-Pingzhangling ophiolite melange belt,the age is determined to be late Devonian to early Carboniferous.Combined with the geological and petrogeochemical characteristics of the melange,the authors propose that the Yantoushan-Pingzhangling Ophiolitic melange was initially formed in a small ocean basin with the characteristics of back arc basin.To a certain extent,it can be classified as the northern Muztag Ophiolite melange belt.Together with the remaining ophiolites in Subash in the west and Animaqing in the East,they constitute the Kangxiwa-Muztag-Animaqing structural belt,which is equivalent to the fourth suture zone of the Qinghai Tibet Plateau.

关 键 词：东昆仑 木孜塔格 雁头山屏障岭 蛇绿混杂岩 放射虫 

分 类 号：P581[天文地球—岩石学]