摘要
新疆西昆仑出露多条蛇绿混杂岩带,苏巴什蛇绿混杂岩带出露于新疆于田县西昆仑玉龙喀什—阿克苏一带,笔者通过对苏巴什蛇绿岩带南带中2个辉长岩样品进行LA-ICP-MS锆石U-Pb测年,获得了较准确的年龄数据(352.7±3.0)Ma和(261.9±2.2)Ma。确定了该蛇绿岩的形成时代为早石炭世—中二叠世,结合混杂岩带中与之共生的沉积岩和相关的边缘地质体综合分析,基本可以确定该蛇绿岩带应是华力西期洋壳残片,与木孜塔格峰、阿尼玛卿等地残存的蛇绿岩的形成时代一致,其共同组成麻扎-康西瓦-木孜塔格构造带,相当于青藏高原第四缝合带。
Several ophiolitic melange belts are exposed in West Kunlun,Xinjiang,in which the Subashi ophiolitic melange belt is occurred in Yurungkash-Aksu area in Yutian County.2 gabbro samples from the southern part of Subashi ophiolite have been dated by LA-ICP-MS zircon U-Pb dating and obtain the age data of(352.7+3)Ma and(261.9+2.2)Ma.It is determined that this ophiolite was formed in early Carboniferous to Middle Permian.After comprehensively analyzing the sedimentary rocks and related marginal geological bodies associated with the mélange belt,it is basically determined that the Subashi ophiolite belt should be a remnant of the valerian oceanic crust,which is consistent with the formation age of the ophiolite in Muztagh and Anemaqen.The ophiolite belts mentioned above constitute the Mazha-Kangxiwar-Muztagh tectonic belt,which is equivalent to the fourth suture zone of the Qingha-Tibetan Plateau.
作者
温志刚
胡成林
王洪强
李文军
聂志刚
王嘉伟
杜尧
WEN Zhigang;HU Chenglin;WANG Hongqiang;LI Wenjun;NIE Zhigang;WANG Jiawei;DU Yao(Shaanxi Geology and Mineral Research Institute Co.,Ltd,Xianyang 712000,Shaanxi,China;Shandong Provincial No.3 Exploration Institute of Geology and Mineral Resources,Yantai 264003,Shandong,China;Xi'an University of Science and Technology,Xi'an 710054,Shaanxi,China)
出处
《西北地质》
CAS
CSCD
北大核心
2019年第4期14-27,共14页
Northwestern Geology
基金
新疆地勘基金中心“新疆于田县硝尔库勒一带1∶5万区域矿产地质调查项目”（K17-1-XJ07），“新疆西昆仑温泉独尖山一带1∶5万区域地质调查项目”（K15-1-LQ20），“新疆西昆仑山普鲁一带1∶5万区域地质调查项目”（K16-1-LQ04）
