西北地质2017，Vol.50Issue(1)：182-197,16.
东昆仑东段阿此特地区变基性侵入岩锆石U-Pb年龄及地质意义
Zircon U-Pb Ages and Geological Significance of MetamorphicBasic Intrusive Rocks in the Acite Area of East Kunlun
摘要
Abstract
The Acite metamorphic basic intrusive rocks in Balong area, Dulan County, located in the eastern section of the central tectonic belt of East Kunlun, are intruded into the Mesoproterozoic Xiaomiao Formation and Paleozoic granitic gneiss.Field geology, petrology and geochemistry characteristics claim that these Acite metamorphic basic intrusive rocks belong to orthometamorphic rocks, and their protoliths are tholeiitic gabbro.The zircon LA-ICP-MS U-Pb geochronology analysis has been conducted for these intrusive rocks, the obtained zircon U-Pb ages vary from(240.8±2.8)Ma to (241.9±7.3)Ma, which belong to middle Triassic.The zircon morphology and geochemistry characteristic show that these zircons have same characteristics with magmatic zircon, representing the forming age of the Acite metamorphic basic intrusive rocks.The abundant captured zircons in these samples were recorded multiphase tectono-magmaticevents of East Kunlun in Precambrian period.关键词
东昆仑造山带/阿此特变基性侵入岩/锆石U-Pb年龄/中三叠世Key words
the East Kunlun Orogen/Acite metamorphic basic intrusive rocks/zircon LA-ICP-MS U-Pb age/middle Triassic分类
天文与地球科学引用本文复制引用
胡晨光,彭思钟,裴先治,李瑞保,陈有炘,刘成军,李佐臣,张玉,颜全治,王兴..东昆仑东段阿此特地区变基性侵入岩锆石U-Pb年龄及地质意义[J].西北地质,2017,50(1):182-197,16.基金项目
国家自然科学基金项目(41472191、41502191、41172186),中央高校基本科研业务费专项资金项目(CHD2011TD020、2013G1271091、2013G1271092、310827161002、310827161006),青海省国土资源厅-中国铝业公司公益性区域地质矿产调查基金项目(中铝基金200801)的成果 （41472191、41502191、41172186）
