内蒙古扎拉格阿木铜多金属矿床硫化物Re-Os年龄及其地质意义  

Re-Os age of sulfide and its geological significance in Zhalageamu copper polymetallic deposit,Inner Mongolia

作　　者：刘怀金 张旭柱 邱广义 许辉 李源 魏亮 李志国 吉虎利 LIU Huaijin;ZHANG Xuzhu;QIU Guangyi;XU Hui;LI Yuan;WEI Liang;LI Zhiguo;JI Huli(Inner Mongolia Nonferrous Geological Mining(Group)Co.,Ltd.,Hohhot 010010,China)

机构地区：[1]内蒙古有色地质矿业(集团)有限责任公司,呼和浩特010010

出　　处：《桂林理工大学学报》2023年第1期61-67,共7页Journal of Guilin University of Technology

基　　金：内蒙古地勘基金项目(2015-01-KY02)。

摘　　要：内蒙古扎拉格阿木铜多金属矿床是近年来在大兴安岭中南段西坡发现的一处中型铜多金属矿床。矿床产出于花岗闪长岩体与中二叠统哲斯组外接触带,矿体分布受北东向断裂构造控制。本文运用Re-Os同位素定年法对主成矿阶段形成的辉钼矿和毒砂开展了成矿年龄测定,获得1件辉钼矿Re-Os模式年龄为141.81±0.84 Ma,3件毒砂Re-Os模式年龄分别为138.1±0.9、140.8±7.7和141.2±2.1 Ma,等时线年龄为137.7±1.7 Ma;4件样品的加权平均年龄为140.2±3.3 Ma。结果表明,该矿床形成于早白垩世,为燕山晚期构造-岩浆-成矿作用耦合的产物。扎拉格阿木铜多金属矿床成矿年龄的首次厘定,对该区铜多金属矿的勘查和矿床成因研究具有指示意义。Zhalageamu copper polymetallic deposit in Inner Mongolia is a medium-sized copper polymetallic deposit discovered in recent years on the west slope of the central and southern section of the Da Hinggan Mountains.The deposit occurs in the contact zone between granodiorite and the Zhesi Formation of the Middle Permian.The distribution of ore bodies are controlled by the NE fault.Re-Os isotopic dating method is used to determine the metallogenic age of molybdenite and arsenopyrite formed in the main metallogenic stage.One molybdenite Re-Os model age is 141.81±0.84 Ma,three arsenopyrite Re-Os model ages are 138.1±0.9,140.8±7.7,141.2±2.1 Ma,respectively,and the isochron age is 137.7±1.7 Ma.The weighted average age of four samples is 140.2±3.3 Ma.The results show that the deposit was formed in the Early Cretaceous and was the product of the coupling of tectonic-magmatic-mineralization in the Late Yanshanian.The first determination of the metallogenic age of Zhalageamu copper polymetallic deposit is of indicating significance to the exploration of copper polymetallic deposit in genesis study.

关 键 词：辉钼矿 毒砂 RE-OS同位素测年 铜多金属矿 扎拉格阿木 大兴安岭 

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