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西藏双湖县商旭造山型金矿床位于班公湖—怒江缝合带中段,矿体受NWW向的脆—韧性断裂构造控制,呈似层状、脉状产于中—下侏罗统木嘎岗日群混杂岩中。围岩为炭质板岩、变石英砂岩等。矿石类型主要为石英脉型和构造蚀变岩型,矿石构造以细脉状和角砾状为主,矿石矿物为自然金。矿床学与同位素地球化学研究认为木嘎岗日群含金建造为商旭金矿提供了主要物质来源,NWW向脆—韧性断裂构造为含金热液的运移和金的沉淀供了运输通道和就位空间,羌塘南缘早白垩世构造—岩浆活动为含金热液的运移提供了热动力,矿区内NWW向构造破碎带中变形强烈,具黄铁矿化、硅化蚀变的地段,为本矿区的找矿有利地区。土壤地球化学调查显示,Ⅲ号矿段南部,T-4、T-5异常区域具有较好的找矿潜力;电法测深资料显示,Ⅲ号矿段的控矿构造在深部还有延伸,并可能与区域较深大的断裂相连。综合分析认为,Ⅲ_(1-2)号矿体在标高4200m以下还具有较大的找矿潜力,通过进一步地质勘查工作,有望提高金资源量,扩大矿床规模。同时,初步总结了商旭造山型金矿床“找矿三步组合拳”的勘查工作方法。
The Shangxu orogenic gold deposit, located in Shuanghu County, Tibet, is located in the middle section of the Bangong-Nujiang suture zone. The ore body is controlled by the NWW trending brittle-ductile fracture structure and appears to be laminar and veined in the Middle-Lower Jurassic Muga Kong day group of melanges. Surrounding rock carbonaceous slate, quartz sandstone and so on. The ore types are mainly quartz veins and tectonic alteration rocks. The ore structures are mainly veinlets and breccias, and the ore minerals are natural gold. Deposit studies and isotopic geochemical studies suggest that the daily gold formation in the Mogagang Subproject provides the major source of material for the Shangxu gold deposit. The transport of the NWW to the brittle-ductile fault structure as a migration of gold-bearing hydrothermal fluids and gold deposits And space in situ, the Early Cretaceous tectonomagmatic activity in the southern margin of the Qiangtang area provided a thermodynamic force for the migration of gold-bearing hydrothermal fluids. The NWW trending structural crust in the mining area is strongly deformed with pyrite and silicification alteration Lot, the prospecting for the mining area. Soil geochemical survey shows that there is a good potential for prospecting in the southern part of No.3 ore body, T-4 and T-5 anomaly areas. The electrical sounding data show that the ore-controlling structure of No.3 ore section extends in the deep part, And may be associated with deeper faults in the area. Comprehensive analysis shows that Ⅲ_ (1-2) orebody has larger potential for prospecting below the elevation of 4200m. Through further geological exploration work, it is expected to increase the gold resources and expand the deposit scale. At the same time, a preliminary summary of the Shangxu orogenic gold deposit “prospecting three-step combined boxing ” exploration work methods.