Geological characteristics and prospecting potential of Xinlong gold deposit in the central section of Middle Lhasa block of Tibet
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摘要: 西藏中拉萨地体中段的鑫龙金矿具有较大的成矿潜力。通过矿产地质调查和初步钻探验证,圈定3条矿(化)体,矿(化)体受NW向和NNW向断裂构造控制,赋存于流纹质角砾熔岩之中,其中Au-II金矿带长300~1 000 m,厚度可达10 m,单工程品位可达17.97 g/t,预测鑫龙金矿矿体可达大型规模,整个矿区有望达到特大型规模。将矿区金的产出划分为“方铅矿+辉砷镍矿+金”组合和“黄铁矿+石英+金”组合,矿区蚀变主要以硅化和中-高级泥化为主。根据矿化和蚀变特征,认为鑫龙金矿是高硫化浅成低温热液型金矿,是西藏陆相火山岩中发现的首例该类型金矿。根据综合地质分析,在鑫龙—郎美拉一带存在完整的斑岩-浅成低温热液型铜金成矿系统,成矿潜力巨大。鑫龙金矿的发现为藏北岩金矿的勘查开辟了新的找矿方向。Abstract: Xinlong gold deposit in Middle Lhasa block of Tibet has great prospecting potential. Through mineral geological survey and preliminary drilling verification, three ore bodies were delineated, which are controlled by the NNW and NNW fault structures. These three ore bodies exist in rhyolitic breccia lava, and the Au-II gold belt are 300~1 000 m long and up to 10 m thick, with single engineering grade of 17.97g/t. It is predicted that the ore body of Xinlong gold deposit can reach large scale, and the whole mining area is expected to reach super large scale. The output of gold is divided into two types, that is galena + arsenonickel + gold combination and pyrite+ quartz + gold combination. The alteration in the mining area is mainly dominated by silicification and medium to high grade argillation. According to the characteristics of mineralization and alteration, it is considered that Xinlong gold deposit is a high sulfide epigenetic type gold deposit, which is the first gold deposit of this type in continental volcanic rocks in Tibet. According to the comprehensive geological analysis, there is a complete porphyry-epithermal type Cu-Au metallogenic system in Xinlong-Langmeila area, which has great prospecting potential. The discovery of Xinlong gold deposit could open up a new direction for the exploration in the northern Tibet gold deposit.
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