高密度电法在北巴颜喀拉山夺尔贡玛锑金矿点找矿中的应用

Application of High Density Electrical Method in Prospecting for Duoguma Antimony Gold Ore Spot in North Bayan Har Mountains

为了解决制约夺尔贡玛锑金矿区找矿突破(如控矿因素、矿床成因)的问题,采用高密度电法对玛多县夺尔贡玛一带1/20万AS_(乙)^(41)Sb(Au)水系沉积物异常及1/5万Au、As、Sb水系沉积物异常进行检查,重点对夺尔贡玛锑金矿点及外围进行面积性探测。平面电阻率异常表明,区域性NW向昆仑山口—玛多—甘德—久治断裂在该区被NE向后期断裂错断改造;2组断裂交会部位叠加有高值充电率(极化率)异常,异常长轴方向与区域构造走向一致,主要分布在构造倾向一侧;结合电阻率断面异常,认为这些分布广且强度大的异常主要分布在区域构造与围岩接触带上。此外,优选与锑、金等多金属元素化探异常套合的充电率(极化率)异常作为找矿靶区进行工程验证,经槽探工程揭露了锑金矿体,实现了新的找矿突破。

In order to solve the problem that restrict the breakthrough of prospecting(such as ore controlling factors and deposit genesis)in Duoguma antimony gold mining area,the 1∶200000 As_(乙)^(41)Sb(Au)stream sediment anomaly and 1∶50000 Au、As、Sb stream sediment anomaly in Duoguma area of Maduo County were examined by high-density electrical method,and the North Duoguma antimony gold mining point and its periphery were mainly detected.The plane resistivity anomaly shows that the regional NW trending Kunlun Mountain pass Maduo-Gande-Jiuzhi fault is transformed by the later NE trending fault dislocation in this area.High value charge rate(polarizability)anomalies are superimposed at the intersection of the two groups of fault structures.The long axis direction of these anomalies is consistent with the trend of regional structure,and the location is mainly distributed on the side of structural tendency.Combined with the analysis of resistivity section anomalies,these widely distributed and strong anomalies are mainly distributed in the contact zone between regional structure and surrounding rock.The charging rate(polarizability)anomaly combined with the anomaly of polymetallic elements such as antimony and gold in geochemical exploration is selected as the prospecting target for engineering verification.The antimony gold orebody is revealed through trenching engineering,realizing the prospecting breakthrough of the polymetallic prospecting target.