The application of tectonogeochemical cuttings survey to gold prospecting in Nanshan area of Danghe, Gansu Province
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摘要: 党河南山是甘肃省重要的金成矿区之一,已发现贾公台、黑刺沟、狼岔沟等一批重要金矿产地,成矿条件极为有利,但由于该区特殊的地球化学景观,外围找矿效果不佳。笔者在开展黑达坂—党河南山地区1:50 000矿产远景调查项目时,针对该区低缓异常,首次将1:10 000构造地球化学岩屑测量方法引入找金工作中,并对区内地球化学特征、元素组合特征等进行相关分析,结合成矿地质背景圈定化探综合异常13处,主成矿元素Au、Pb、Ag及探途元素As、Sb在有利构造部位强烈富集。通过槽探揭露,新发现金矿化带6条,圈定金矿体15个,并进一步将该方法推广到相邻区域的找金工作中,取得了良好的找矿效果。该方法的成功应用,对浅覆盖高寒荒漠地球化学景观区找矿具有重要的借鉴意义。Abstract: Danghe Nanshan is one of the important gold metallogenic areas in Gansu Province. A number of important gold deposits have been discovered there, such as Jiagongtai, Heicigou and Langchagou, suggesting that the metallogenic conditions are very favorable. However, due to the special geochemical landscape of this area, the peripheral prospecting effect is not good. When carrying out the 1:50 000 mineral prospect survey project in Heidaban-Danghe Nanshan area and aiming at the low and gentle anomalies in the area, the authors introduced the 1:10 000 tectono-geochemical debris survey method into the gold prospecting work for the first time, and analyzed the geochemical characteristics and element combination characteristics in this area. Combined with the metallogenic geological background, 13 comprehensive geochemical anomalies were delineated, and it was found that the main metallogenic elements Au, Pb and Pb and exploration elements As and Sb are intensively enriched in favorable structural positions. Through trenching, 6 new gold mineralization zones were discovered and 15 gold orebodies were delineated. This method was further applied to the gold prospecting in adjacent areas, with good prospecting results achieved. The successful application of this method is of great significance for prospecting in the geochemical landscape area of shallow covered Alpine desert.
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