投稿时间：2018-10-30
修订日期：2019-06-24
网络发布日期：2020-02-26
中文摘要:寒山金矿床位于北祁连造山带西段与阿尔金断裂的交汇部位，是奥陶系阴沟群火山-沉积岩系中断裂破碎蚀变带控制的金矿床。前人对寒山金矿床的地质特征、成矿时代、矿床地球化学及成因等进行了研究和探讨，取得了不少研究成果，结合前人研究，本次工作获得黄铁绢英岩型金矿石中绢云母Ar-Ar坪年龄为（302.5±1.8）Ma，获得矿区南部闪长岩体锆石U-Pb年龄为（390.4±9.5）Ma，并对成矿时代和岩体与成矿关系进行了探讨，认为主成矿阶段为华力西期，进一步确定矿区闪长岩体与金成矿有关。成矿作用与EW向次级小构造关系密切。
Abstract:Located at the intersection of western North Qilian orogenic belt and Altun fault belt, the Hanshan gold deposit is controlled by broken alteration zone in the volcanic-sedimentary rock of the Ordovician Yingou Group. Previous researchers have made researches and investigation into this ore deposit in such aspects as geological characteristics, ore-forming epoch, geochemistry and genesis, and obtained lots of achievements. In combination with previous research results,the authors detected that the Ar-Ar plateau age of the sericite in beresite is (302.5±1.8)Ma, and the zircon LA-ICP MS dating result of the diorite in southern part is(390.4±9.5)Ma. On such a basis, the authors discussed the ore-forming epoch and the relationship between the rock mass and mineralization. It is held that the ore-forming process took place in Hercynian period, diorite was closely related to gold mineralization, and mineralization was related to EW-trending secondary structures.
keywords:geochemistry age of altered rock age of intrusive rocks ore-forming period Hanshan gold deposit North Qilian Mountain
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基金项目:本文得到中国地质调查局项目“祁连成矿带肃南—大柴旦地区地质矿产调查（编号：DD20160012）”资助
引用文本：
刘永彪,余君鹏,孔维琼,樊新祥,赵吉昌,李省晔,王鹏.2020.北祁连山西段寒山金矿床成矿时代探讨[J].矿床地质,39(1):135~146LIU YongBiao,YU JunPeng,KONG WeiQiong,FAN XinXiang,ZHAO JiChang,LI ShengYe,WANG Peng.2020.A study of ore-forming epoch of Hanshan deposit in western North Qilian Mountain[J].Mineral Deposits39(1):135~146
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