新疆东天山黄滩金铜锌矿成矿时代——来自白云母^(40)Ar-^(39)Ar年龄和黄铁矿Re-Os年龄约束  

Ore-forming Age of the Huangtan Au-Cu-Zn Deposit in the East Tianshan,Xinjiang:Constraints from Muscovite^(40)Ar-^(39)Ar Age and Pyrite Re-Os Age

作　　者：耿新霞[1] 张志欣[2] 张振龙 李宁[3] 杨富全[1] 杨成栋[1] 成曦晖 GENG Xinxia;ZHANG Zhixin;ZHANG Zhenlong;LI Ning;YANG Fuquan;YANG Chengdong;CHENG Xihui(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011 [3]太原理工大学矿业工程学院,山西太原030024 [4]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《大地构造与成矿学》2024年第2期368-379,共12页Geotectonica et Metallogenia

基　　金：国家自然科学基金面上项目(42072100);国家重点研发计划项目(2022YFC2903305)联合资助

摘　　要：卡拉塔格是东天山十分重要的铜矿集区,发育5个不同时代和成矿类型的成矿系统。近年来新发现了黄滩(包括金岭)金铜锌矿床,赋存于火山岩系中,发育层状矿化、脉状矿化和黄铁绢英岩化,但层状矿化和黄铁绢英岩化形成时代不清楚,制约了进一步找矿勘查工作。本文基于野外调查和室内研究,开展白云母^(40)Ar-^(39)Ar年龄和黄铁矿Re-Os年代学研究,获得黄铁绢英岩中白云母^(40)Ar-^(39)Ar坪年龄为429.46±3.91 Ma,7件层状矿化中黄铁矿Re-Os等时线年龄为436.5±4.2 Ma。层状矿化年龄与前人获得含矿岩系英安岩和英安质凝灰岩年龄(434~438 Ma)、脉状矿化年龄(432~438 Ma)一致,表明层状矿化、脉状矿化和黄铁绢英岩化是同一成矿事件的产物,黄滩为富金火山成因块状硫化物(VMS)型矿床。因此,尽管黄滩和红海‒黄土坡为VMS型矿床,红石为火山热液脉状矿床,但它们均为同一VMS成矿系统,形成于430~439 Ma,受控矿因素的差异,造成了成因类型、矿化类型和成矿元素组合的多样性。The Kalatag area is an important copper ore-concentrated area in East Tianshan,which developed a multiperiod and multitype metallogenic system.The Huangtan(including the Jinling)Au-Cu-Zn deposit was discovered recently in the volcanic series.The major ore types include stratiform-,vein-ores,and beresitization(pyrite+sericite+quartz).However,the formation ages of the stratiform-ore and beresitization remain unclear,which restricts further ore prospecting and exploration.Based on the field investigation and laboratory study,a chronology study was carried out.The^(40)Ar-^(39)Ar plateau age of muscovite from the beresitization is 429.46±3.91 Ma.The Re-Os isochronal age of pyrite from the stratiform-ore is 436.5±4.2 Ma.The age of the stratiform mineralization is consistent with the previously reported ages of the ore-bearing rock series(dacite and dacitic tuff,434–438 Ma)and the vein mineralization(432–438 Ma),indicating that the stratiform-,vein-ores,and beresitization are products of the same metallogenic system;therefore,the Huangtan is a gold-rich VMS-type deposit.It can be inferred that the Huangtan and Honghai-Huangtupo VMS-type deposits and the Hongshi volcanic hydrothermal vein-type deposit were formed at 430–439 Ma and resulted from the same VMS metallogenic system.The differences in ore-controlling factors resulted in the diversity of the genetic types,mineralization types,and metallogenic element assemblages of these deposits.

关 键 词：白云母^(40)Ar-^(39)Ar年龄 黄铁矿Re-Os年龄 VMS矿床 金铜锌 黄滩 东天山 

分 类 号：P611[天文地球—矿床学] P597[天文地球—地质学]