东昆仑那陵格勒河地区新元古代变质侵入体LA-ICP-MS锆石U-Pb年龄及意义  

Single-Zircon U-Pb and Geological Significance of Metamorphic and Intrusive System of NALINGELE Region in East Kunlun Neo-proterozoic

作　　者：严玉峰[1,2] 杨波 李焕学[1,2] 才航加 许海全[1,2] 许玉豪 

机构地区：[1]青海省地质调查院,青海西宁810012 [2]青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012

出　　处：《西北地质》2017年第4期33-40,共8页Northwestern Geology

基　　金：中国地质调查局西安地质调查中心“青海1∶25万布伦台、大灶火幅区调修测”项目(1212011121187)

摘　　要：在东昆仑那陵格勒河地区发现新元古代变质侵入体,侵位于古元古代金水口岩群及中—新元古代万宝沟岩群中,岩性为花岗闪长质片麻岩和二长花岗质片麻岩。通过对花岗闪长质片麻岩的LA-ICP-MS锆石U-Pb测年,获得岩体形成的年龄为(840±2)Ma。岩石地球化学显示强过铝质-高钾钙碱性系列岩石特征,属S型花岗岩,形成于大陆碰撞造山环境,为同碰撞环境下岩浆作用产物。该岩体与东昆仑地区已报道的新元古代变质侵入岩(体)为同一性质,表明东昆仑地区存在一条新元古代花岗岩深成侵入岩带。整个东昆仑可能曾响应了全球罗迪尼亚超大陆的汇聚事件。Neo proterozoic metamorphic and intrusive rocks（bodies）are discovered in Nalinggelehe area in East Kunlun, which were intruded into Jinshuikou Paleo proterozic rock group and Wanbaogou Mesoproterozoic Neoproterozoic rock group, with the lithology of granodioritic gneiss and monzonitic granitic gneiss. The LAICPMS zircon dating of granodioritic gneiss has yielded an age of （840±2）Ma, which belongs to the Neo proterozoic era.Rock geochemistry shows the characteristics of strong peraluminous, high potassium calc alkaline series rock, with the features of S type granite, which was formedin continental collision orogenic environment and served as a product of the collision environment.This age and the available dating data suggest that a Meso to Neo Proterozoic granitic intrusive belt exists in the eastern margin of the Kunlun block, and that the whole Kunlun block might be a response to the amalgamation event of global Rodinia supercontinent.

关 键 词：新元古代 变质侵入体 花岗闪长质片麻岩 大陆碰撞造山 

分 类 号：P595[天文地球—地球化学]