东昆仑东段阿此特地区变基性侵入岩锆石UPb年龄及地质意义

胡晨光; 裴先治; 李瑞保; 陈有炘; 刘成军; 李佐臣; 张玉; 颜全治; 王兴; 彭思钟

东昆仑东段阿此特地区变基性侵入岩锆石UPb年龄及地质意义

Zircon U-Pb Ages and Geological Significance of Metamorphic Basic Intrusive Rocks in the Acite Area of East Kunlun

摘要

摘要: 都兰县巴隆地区的阿此特变基性侵入岩出露于东昆中构造带东段，侵位于中元古界小庙岩组和新元古代花岗质片麻岩中。野外地质、岩石学和地球化学特征显示，阿此特变基性侵入岩为正变质岩，原岩为拉斑质辉长岩。对阿此特变基性侵入岩进行LA-ICP-MS锆石U-Pb同位素年龄测定，获得其形成年龄介于（240.8±2.8）Ma~（241.9±7.3）Ma之间，为中三叠世。锆石特征和地球化学信息显示，锆石具岩浆成因特征，代表阿此特变基性侵入岩的形成年龄。样品中大量捕获锆石反映了东昆仑地区在前寒武纪经历了多期的构造岩浆热事件。

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.

HTML全文

参考文献(98)

施引文献

资源附件(0)