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.
作者
耿新霞
张志欣
张振龙
李宁
杨富全
杨成栋
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)
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
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