Metallogenic Model and Ore Prediction of the Beisanduan Ag-Pb Polymetallic Depoisitin Linxi County, Inner Mongolia
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摘要: 内蒙古林西县北三段银铅多金属矿床是一个以银为主，并伴生有可综合利用铅、锌元素的大型矿床，矿床成因类型属于低温热液型矿床。通过对北三段银铅多金属矿床的矿区地质背景、矿床地质特征、矿体特征和矿石特征等综合调查研究，结合对矿床的成矿地质特征、成矿时代分析，并应用铅同位素探讨成矿物质来源等，提出了该矿床的成矿模式。结合该矿床的成矿模式，对该矿床及其外围地区进行成矿潜力预测；依据成矿控矿地质条件分析，提出了有利找矿靶区，认为区域内北西向断裂构造、北西向与北东向及东西向与南北向断裂构造交汇部位、与晚侏罗世末期岩浆活动有关的煌斑岩和辉绿岩等脉岩集中区域附近、北三段矿区与大井矿区之间区域以及北三段矿区深部为找矿有利部位，为进一步找矿工作提供重要理论依据。Abstract: The Beisanduan Ag-Pb polymetallic deposit is an epithermal deposit, which is silver-basedand associated with comprehensive utilization Pb, Zn. Based on the geological background of mining area, geological characteristics of mineral deposit, orebody and ore characteristics, the regional geological characteristics and metallogenic epoch have been analyzed, the source of ore-forming materials has been discussed by applying Pb isotopes, and then the metallogenic model for this deposit has been proposed.According to metallogenic model, the predictability of metallogenic potential in this deposit and its surrounding has been discussed, which provide foundation and suggestion for the further ore-prospecting. Then five ore-prospecting criteria have been put forward. The NW-trending faults, theintersections between NW-and NE-trending faults or the ones between EW-and SN-trending faults, the lamprophyre and diabase dykes related Late Jurassic magmatic activity and adjacent area, the region between Beisanduan and Dajingdeposits, as well as the depth of Beisanduan deposit serve as the favorable positions for ore prospecting.
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