北祁连山西段寒山金矿床成矿时代探讨  

A study of ore-forming epoch of Hanshan deposit in western North Qilian Mountain

作　　者：刘永彪 余君鹏 孔维琼[1,3] 樊新祥 赵吉昌 李省晔 王鹏 LIU YongBiao;YU JunPeng;KONG WeiQiong;FAN XinXiang;ZHAO JiChang;LI ShengYe;WANG Peng(Fourth Institute of Geological and Mineral Exploration of Gansu Bureau of Geology and Mineral Resources,Jiuquan 735000,Gansu,China;Gansu Geological Survey Research Institute,Lanzhou 730000,Gansu,China;Lanzhou New Area County Natural Resource Bureau,Lanzhou 730000,Gansu,China)

机构地区：[1]甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉735000 [2]甘肃省地质调查院,甘肃兰州730000 [3]兰州新区自然资源局,甘肃兰州730000

出　　处：《矿床地质》2020年第1期135-146,共12页Mineral Deposits

基　　金：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

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。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.

关 键 词：地球化学 蚀变岩年龄 侵入岩年龄 成矿时代 寒山金矿床 北祁连山西段 

分 类 号：P618.31[天文地球—矿床学]