滇西三江造山带中段马登盆地两个富碱火山岩的锆石U-Pb定年及地质意义  

LA-ICP-MS Zircon U-Pb Geochronology and Its Geological Significance of Ttwo Volcanic Rocks from the Madeng Basinof the Sanjiang Orogenic Belt in Western Yunnan

作　　者：韩雪[1,2,3] 杨天南 信迪 梁明娟[1,2] HAN Xue;YANG Tian-nan;XIN Di;LIANG Ming-juan(China University of Geoscience,Beijing 100083,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Guizhou Geological Survey,Guiyang 550081,Guizhou,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院地质研究所,北京100037 [3]贵州省地质调查院,贵州贵阳550081

出　　处：《贵州地质》2019年第1期69-76,共8页Guizhou Geology

基　　金：国家973项目<西南特提斯典型复合成矿系统及其深部驱动机制>课题一<特提斯构造-岩浆演化及深部动力学过程>(课题编号:2015CB452601);中国地质调查局地质调查项目(项目编号:12120114064341)联合资助

摘　　要：运用LA-ICP-MS锆石U-Pb同位素定年的方法测定了滇西三江造山带中段马登盆地内的2件富碱火山岩的年龄。结果表明马登盆地内粗安质火山岩形成年龄约在35Ma。富碱火山岩的形成时间与滇西三江造山带南段中东带内的新生代富碱斑岩岩浆作用高峰期一致,同样属于青藏高原后碰撞岩浆作用的时间范围内,这些富碱岩浆岩的岩浆活动是对印度-欧亚大陆巨大碰撞的一种响应。The zircon U-Pb isotopic age of two alkali-rich porphyries was determined by LA technique at 35Ma from the Madeng Volcanic Basin,the Sanjiang orogenic belt.The formation of the two samples are as same as the magmatic peak of others alkali-rich porphyries from the southern Sanjiang orogenic belt.They belong to the time of post-collision magmatism in the Tibetan plateau and the magmatism is a response to the giant collision between India and Eurasia.

关 键 词：富碱火山岩 马登盆地 LA-ICP-MS锆石U-Pb同位素定年 岩浆作用 

分 类 号：P588.15[天文地球—岩石学] P597.3[天文地球—地质学]