新疆萨热阔布金矿黑云母^(40)Ar/^(39)Ar年龄及矿床成因启示  

Biotite ^(40)Ar /^(39)Ar Geochronology Constraint on the Genesis of the Sarekuobu Gold Deposit,Xinjiang

作　　者：郑义[1,2,3] 李登峰[2] 张莉[2] 陈华勇[2] 

机构地区：[1]中山大学地球科学与地质工程学院,广东广州510275 [2]中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广东广州510640 [3]广东省地质过程与矿产资源探查重点实验室,广东广州510275

出　　处：《中山大学学报（自然科学版）》2014年第6期10-18,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家973资助项目(2014CB440802);中山大学青年教师起步计划资助项目(32110-3321400)

摘　　要：新疆萨热阔布金矿位于阿尔泰造山带南缘克兰盆地内,矿体呈脉状产于康布铁堡组火山岩地层中。为准确厘定其成矿时代,对矿区含矿石英脉中的云母进行了年龄测定,1件黑云母样品的40Ar/39Ar坪年龄为(213.5±2.3)Ma,相应的等时线年龄为(212.4±2.2)Ma,反等时线年龄为(212.5±2.2)Ma,与坪年龄在误差范围内一致。据此,萨热阔布金矿成矿作用发生于约213 Ma,成矿年龄晚于成岩年龄(~400 Ma)约180 Ma。因此,萨热阔布金矿为后生矿床。成矿年龄略晚于区域变质作用(~250 Ma)约37 Ma,推测成矿与阿尔泰造山带碰撞造山作用有关。结合矿床地质特征和流体包裹体特征,认为萨热阔布金矿为碰撞造山体制下形成的造山型金矿。The genesis of polymetallic deposits in southern Altay,NW China has been disputed between a syngenetic seafloor hydrothermal process and an epigenetic orogenic-type mineralization.The Sarekuobu gold deposit occurs as NW-trending veins in the Devonian Kelan volcanic-sedimentary basin of the Altay orogenic belt.To constrain the metallogenic age,biotite 40 Ar/39 Ar geochronological analysis was carried out in this paper.One biotite sample separated from the gold-bearing lodes yielded 40 Ar/39 Ar isotopic plateau age of （213.5 ±2.3）Ma,representing the mineralization age of gold-polymetallic sulfides.By summarizing the available isotopic ages and geochemistry data,a significant collision event and related metallogeny during the Triassic in the Altay Orogen is recognized.In combination with the characteristics of ore geology and fluid inclusion geochemistry,the Sarekuobu gold deposit can be determined as an epi-genetic orogenic-type gold deposit.

关 键 词：黑云母40 Ar/39 Ar坪年龄 萨热阔布金矿 造山型金矿 阿尔泰造山带 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]