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姐拉各普金矿是藏南扎西康矿集区内最新发现的金矿床,为了解该矿床的成矿时代,探讨其成矿机制,对金矿床中含矿石英脉中绢云母开展Ar-Ar年代学测试,以及氢氧同位素示踪,并与矿集区内铅锌金锑矿床开展对比研究。分析结果表明,姐纳各普金矿成矿时代为17.6±1.8 Ma,与矿集区内铅锌金锑成矿时代,以及错那洞穹窿中淡色花岗岩和伟晶岩形成时代相一致。结合同位素示踪,本文认为扎西康矿集区铅锌金锑成矿系统受错那洞片麻岩穹窿控制,形成时代主要集中在16.6~18.7 Ma,中新世岩浆活动提供的热量驱动地下水循环,并萃取地层或喜马拉雅基底成矿物质,在少量岩浆流体及成矿物质的参与下,沿南北向及其次级断裂构造部位上移聚集成矿,构成穹窿—岩浆—地层—构造四位一体的控矿系统。
The sister Laopupu gold deposit is the newly discovered gold deposit in the Zhaxikang ore district in the southern Tibet. In order to understand the metallogenic epoch of the deposit and explore its metallogenic mechanism, Ar dating, and hydrogen and oxygen isotope tracing, and compared with the lead, zinc, gold and antimony deposits in the ore district. The results show that the age of the sister najapu gold deposit is 17.6 ± 1.8 Ma, which is consistent with the lead-zinc-gold-antimony metallogenic epoch and the age of pale granite and pegmatite in the fault hole of the Kerong Cave. Combined with isotope tracing, the authors believe that the lead-zinc-gold-antimony metallogenic system in the Zhaxikang ore district is controlled by the gneissic gneiss in the Faulty Triassic. The age of formation is mainly concentrated between 16.6 and 18.7 Ma. The heat provided by the magmatic activity of the Miocene pumped the groundwater cycle. With the participation of a small amount of magmatic fluids and ore-forming materials, the ore-forming materials extracted from the strata or the Himalayan basement migrate up and down along the north-south direction and its secondary faults to accumulate mineralization and form a controlled ore deposit with a dome-magma-stratum-tectonics system.