内蒙古贺根山蛇绿岩的形成时代:来自辉长岩LA-ICP-MS锆石U-Pb年龄的证据  

Age of Ophiolite Formation in Hegenshan,Inner Mongolia:Evidence from LA-ICP-MS Zircon U-Pb Dating of Gabbro

作　　者：张治国 靳琪 刘希军[2,3] 唐国强 杨有海 肖让 田昊 Zhang Zhi-guo;Jin Qi;Liu Xi-jun;Tang Guo-qiang;Yang You-hai;Xiao Rang;Tian Hao(College of Civil Engineering,Hexi University,Zhangye Gansu 734000;Guilin University of Technology,Guilin Guangxi 541004;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi Xinjiang 830011)

机构地区：[1]河西学院土木工程学院,甘肃张掖734000 [2]桂林理工大学,广西桂林541004 [3]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011

出　　处：《河西学院学报》2024年第5期81-87,共7页Journal of Hexi University

基　　金：国家自然科学基金项目(2055208);甘肃省青年科技基金项目(23JRRG0017);甘肃省教育厅博士基金项目(2023QB-084);河西学院博士科研启动基金项目(KYQD2023010);河西学院教学研究项目(HXXYJY-2021-66);河西学院第十三批大学生科技创新项目(143);2023年国家级大学生创新创业训练计划项目(202310740039);2023年省级大学生创新创业训练计划项目(S202310740075)。

摘　　要：内蒙古贺根山蛇绿岩是兴-蒙造山带最年轻的蛇绿岩带,被认为是华北板块和西伯利亚板块碰撞的缝合线向东延伸的部分,其代表的古洋盆的形成和关闭时限,一直受到地学界的密切关注。采用LA-ICP-MS锆石U-Pb同位素方法,获得贺根山蛇绿岩中辉长岩的年龄为357.9±1.5Ma,这代表了贺根山蛇绿岩的结晶年龄。结合前人研究成果,推断贺根山蛇绿岩形成于洋内弧后盆地环境。The Hegenshan ophiolite in Inner Mongolia is the youngest ophiolite belt in the Xing'an Mongolian orogenic belt,considered to be the eastward extension of the suture line from the final collision between the North China Plate and the Siberian Plate.The timeframe for the formation and closure of the paleo-oceanic basin it represents has garnered significant attention from the geoscientific community.Using the LA-ICP-MS zircon U-Pb isotope method,the age of the gabbro in the Hegenshan ophiolite was determined to be 357.9±1.5 Ma,which represents the crystallization age of the Hegenshan ophiolite.Combined with the results of previous research,this study suggests that the Hegenshan ophiolite formed in an intra-oceanic back-arc basin environment.

关 键 词：贺根山蛇绿岩 辉长岩 锆石U-Pb同位素方法 洋内弧后盆地 

分 类 号：P588.14[天文地球—岩石学]