新疆吐克吐克铜矿黄铜矿Re-Os定年及成矿意义  

Re-Os Geochronology of the Tuketuke Cu Deposit in Western Junggar,NW China and Its Metallogenic Significance

作　　者：王冉[1] 李永军[1] 王军年[2] 张胜龙[1,3] 郭鑫[1] 段丰浩 

机构地区：[1]长安大学地球科学与资源学院、西部矿产资源与地质工程教育部重点实验室,西安710054 [2]新疆地质矿产勘查开发局地质七队,新疆乌苏833000 [3]核工业二○三研究所,陕西咸阳712000

出　　处：《地质学报》2016年第3期489-499,共11页Acta Geologica Sinica

基　　金：中国博士后基金特别项目(编号2013T60869)资助的成果

摘　　要：吐克吐克铜矿为笔者新发现,产于新疆西准噶尔构造带南部,成矿时代尚缺乏精确的同位素年代学制约。该矿床硫化物组合单一,主要为黄铜矿。本文选择了8件黄铜矿样品,进行Re-Os法定年。结果得到了较好的效果,所有样品的Re含量为39.7×10^(-12)~2440.6×10^(-12),^(187)Os含量为1.2×10^(-12)~9.0×10^(-12),给出的等时线年龄为288.3±8.8Ma。这表明该区Cu的成矿作用与晚石炭世—早二叠世区域峰期岩浆活动一致,证实该区仍存在较大找矿空间。The Tuketuke copper deposit,discovered in 2010,is located in the West Junggar region of Xinjiang,northwest China.There has been no precise formation time reported for this deposit.The deposit is hosted within the Xiaerpu granodiorite（named No.956 highland pluton in the past） that intrudes into Early Carboniferous sedimentary strata and its exo-contact zone.The main mineral in this deposit is chalcopyrite.Re-Os dating for eight chalcopyrite samples obtained from three prospecting engineering in the deposit yields a Re-Os isochron age of 288.3 ± 8.8 Ma（2σ）,with an initial ^（187）Os/^（188）Os of 0.0 ± 1.1,a variety of Re content from 39.7 × 10^（-12）to 2440.6 × 10^（-12）,and relative low content of ^（187）Os from 1.2 ×10^（-12）to 9.0 × 10^（-12）.The Re-Os isochron age of the molybdenite is consistent with the peak ages of the magmatic activity in the West Junggar region,which indicates that the deposit is genetically related with an Early Permian metallogenic system.This consistency suggests the relative large potentiality of finding more Cu deposits in the belt.

关 键 词：黄铜矿 RE-OS定年 吐克吐克 区域成矿 西准噶尔 

分 类 号：P597.3[天文地球—地球化学] P618.41[天文地球—地质学]