地质通报2017，Vol.36Issue(6)：1001-1009,9.
祁漫塔格东段晚三叠世—早侏罗世花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb dating of the Late Triassic-Early Jurassic granites in the eastern part of Qimantag area and its geological significance
摘要
Abstract
The Late Triassic-Early Jurassic granitic assemblage in the eastern part of Qimantag area has high SiO2 content (72.18％～ 76.55％),high K2O content (4.08％～5.32％) and obvious negative Eu anomaly (average σ Eu value being 0.28).The granitic assemblage is composed of monzogranite and syenogranite,whose ages were precisely redefined by the LA-ICP-MS zircon U-Pb method,being 205.1 ±1.0Ma and 199.5±1.2Ma respectively.This granitic assemblage has close relationship with skarn-type polymetallic deposits in Lalinggaoli area.Therefore,the authors preliminarily hold that the Late Triassic-Early Jurassic granitic assemblage is probably an important ore-forming magmatic formation in the eastern part of Qimantag area.关键词
祁漫塔格/花岗岩/晚三叠世—早侏罗世/LA-ICP-MS锆石U-Pb年龄Key words
Qimantag/granite/Late Triassic-Early Jurassic/LA-ICP-MS zircon U-Pb age分类
天文与地球科学引用本文复制引用
赵洪菊,陈静,王秉璋,陈发彬,王国良,宋泰忠..祁漫塔格东段晚三叠世—早侏罗世花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(6):1001-1009,9.基金项目
中国地质调查局项目《柴达木周缘及邻区成矿带地质矿产调查评价专项》(编号:1212010818048)、青海省地质勘查基金项目《青海省格尔木市拉陵灶火铜多金属矿整装勘查区找矿部署研究》(编号:青国土资矿[2015]83) （编号:1212010818048）
