西北地质2017，Vol.50Issue(3)：54-64,11.
东昆仑五龙沟地区糜棱岩化花岗岩年代学、岩石成因及其构造意义
Geochronology and Petrogenesis of Mylonitized Granite from Wulonggou Area in East Kunlun and Its Tectonic Significance
摘要
Abstract
The mylonited granite is located at Shenshuitan mining setion of Wulonggou area in the middle part of the East Kunlun,with a yielded LA-ICP-MS zircon U-Pb age of 389.7± 3.9Ma.This granite has high SiO2 (74.86％～76.64％),K2O (5.20％～6.06％) and total alkali content (K2O + Na2O =8.05％～8.83％) values.The samples are characterized by strong loss in Ba,Nb-Ta,Sr,P and Ti,as well as strong negative Eu anomaly (δ Eu =0.07～0.12),which shows characteristics of A type granite.Combined with the studies of Silurian-Devonian magmatic rocks in this studying area,it's proposed that the East Kunlun Orogenic belt has entered the post-collision stage in early Devonian,and the most intense of extension was happened in the conversion period of from early Devonian to middle Devonian,forming A type granite with considerable size,and standing for the end of the Caledonian orogenic cycle.关键词
东昆仑五龙沟地区/锆石U-Pb年龄/岩石成因/构造意义Key words
Wulonggou area in East Kunlun/Zircon U-Pb age/petrogenesis/tectonic significance分类
天文与地球科学引用本文复制引用
胡继春,陈静,何书跃,李玉龙,舒树兰,王亚栋..东昆仑五龙沟地区糜棱岩化花岗岩年代学、岩石成因及其构造意义[J].西北地质,2017,50(3):54-64,11.基金项目
青海省应用基础研究“东昆仑拉陵灶火地区岩浆成矿作用及靶区优选”(2015-ZJ-762) （2015-ZJ-762）
