温志刚,胡成林,王洪强,李文军,聂志刚,王嘉伟,杜尧.新疆西昆仑苏巴什蛇绿岩形成时代及其构造意义[J].西北地质,2019,52(4):14-27
新疆西昆仑苏巴什蛇绿岩形成时代及其构造意义
Formation Age of Subashi Ophiolitic in West Kunlun, Xinjiang and Its Tectonic Implication
投稿时间:2019-04-01  修订日期:2019-08-05
DOI:
中文关键词:  锆石U-Pb测年;构造意义;苏巴什蛇绿岩;西昆仑
英文关键词:Zircon U-Pb dating;Tectonic significance;Subashi ophiolitic;West Kunlun
基金项目: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)
作者单位
温志刚 陕西地矿区研院有限公司, 陕西 咸阳 712000 
胡成林 山东省第三地质矿产勘查院, 山东 烟台 264003 
王洪强 陕西地矿区研院有限公司, 陕西 咸阳 712000 
李文军 陕西地矿区研院有限公司, 陕西 咸阳 712000 
聂志刚 陕西地矿区研院有限公司, 陕西 咸阳 712000 
王嘉伟 陕西地矿区研院有限公司, 陕西 咸阳 712000 
杜尧 西安科技大学, 陕西 西安 710054 
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中文摘要:
      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。
英文摘要:
      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.
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