地质力学学报2018，Vol.24Issue(2)：188-198,11.DOI:10.12090/j.issn.1006-6616.2018.24.02.020
青海东昆仑西藏大沟金矿床花岗闪长斑岩锆石U-Pb年龄、地球化学及其成矿意义
ZIRCON U-PB DATING,GEOCHEMICAL CHARACTERISTICS AND METALLOGENIC SIGNIFICANCE OF GRONODIORITE PORPHYRY FROM THE XIZANGDAGOU GOLD DEPOSIT IN EAST KUNLUN,QINGHAI PROVINCE
摘要
Abstract
The Xizangdagou gold deposit lies in the Bayan Har tectonic belt of East Kunlun.LA-ICP-MS zircon U-Pb dating shows that the weighted mean age of granodiorite porphyry, which is closely related with the mineralization of the Xizangdagou gold deposit, is(225.0 ±1.2)Ma, in the Late Triassic. This suite of rocks are enriched in LILE(such as Rb,Sr,Ba,K),LREE and Pb,relatively depleting in HFSE(such as Nb,Ta,P,Ti),with rich LREE and low HREE.Based on the study of evolutionary characteristics of regional structures and chronologic data of gold deposits in East Kunlun, the authors suggest that the granodiorite porphyry in the Xizangdagou gold deposit was formed under a conversion tectonic setting from compressional to extensional,and the Xizangdagou gold deposit formed at 225.0~218.6 Ma,in the Late Triassic.关键词
地球化学/锆石U-Pb测年/花岗闪长斑岩/西藏大沟/东昆仑Key words
geochemistry/zircon U-Pb dating/granodiorite porphyry/Xizangdagou/East Kunlun分类
天文与地球科学引用本文复制引用
李金超,孔会磊,栗亚芝,国显正,南卡俄吾,王贤孝,贾群子,张斌,姚学钢..青海东昆仑西藏大沟金矿床花岗闪长斑岩锆石U-Pb年龄、地球化学及其成矿意义[J].地质力学学报,2018,24(2):188-198,11.基金项目
中国地质调查局地质调查项目(DD20160013,12120115022101,1212010918044,12120113029000) （DD20160013,12120115022101,1212010918044,12120113029000）
