摘要
祁漫塔格是青海省内一个重要的多金属成矿区。近年来,新发现了多处与花岗岩有关的钨、锡、铜、多金属矿床。本文报道了祁漫塔格西段苏鲁格萨依花岗岩LA-ICP-MS锆石U-Pb定年数据,15颗岩浆锆石给出的206Pb/238U年龄加权平均值为(450±5.5)Ma,代表了花岗岩的结晶年龄。结合区域地质背景,认为该岩体形成于祁漫塔格洋由俯冲向碰撞转换的构造背景下。
Qimantage is one of the most important metallogenic districts in Qinghai Province.Many granitoid-related tungsten,tin,copper and polymetallic deposits have been discovered recently.This paper presents new zircon LA-ICPMS U-Pb dating of Sulugesayi granite in the Western of Qimantage.The LA-ICP-MS U-Pb dating yields a weighted mean 206Pb/238U age of(450±5.5)Ma for the K-feldspar granite intrusion,representing the crystallization age of the Sulugesayi granite.In combination with regional geological setting,the authors hold that the intrusive body was formed in the tectonic setting of the Qimantage district had accomplished the environment conversion from subduction to collision.
作者
程静
CHENG Jing(Geological Publishing House,Beijing 100083,Beijing,China)
出处
《吉林地质》
2019年第3期5-9,共5页
Jilin Geology
