云南盈江白马山铅锌矿地质特征及找矿标志

Geological Characteristics and Ore-Prospecting Indicators of Baimashan Lead-Zinc Deposit in Yingjiang,Yunnan

盈江白马山铅锌矿区位于云南“三江”腾冲—梁河多金属成矿带,矿区铅锌矿体赋存于下泥盆统关上组一段的断裂破碎带中。矿体形态呈脉状、透镜状,常见膨缩变化、尖灭再现等现象,矿体严格受地层与构造控制,尤其与层间断层关系密切。通过现场勘查分析认为,白马山铅锌矿为热液充填型脉状矿床,与矿化相关的围岩蚀变为矽卡岩化、绢云母化、褐铁矿化、碳酸盐化和硅化,土壤化探异常可作为矿区重要找矿标志。

Baimashan lead-zinc mine of Yingjiang is located in Tengchong-Lianghe polymetallic metallogenic belt of“Sanjiang”in Yunnan Province,The lead-zinc orebody occurs in the fracture zone of the first member of Guanshang formation of Lower Devonian.The shape of the ore body is vein-like and lenticular,the expansion and shrinkage,reappearance are common phenomenon.The ore body is strictly controlled by the strata and structure,especially closely related to interlayer faults.Based on the site inspection,the author thinks that the Baimashan lead-zinc deposit is a hydrothermal filling vein deposit.The wall rock alterations related to mineralization are skarnization,sericitization,limonite mineralization,carbonation and silicification.Soil geochemical anomaly can also be used asimopor-tant prospecting indicator in this mining area.