甘肃省宕昌县代家庄铅锌矿的发现 及物探化探找矿效果

甘肃省宕昌县代家庄铅锌矿床以氧化矿石为主,矿体赋存在浅海台地相、生物礁滩相形成的生物碎屑灰岩、硅质岩中,受北西向张扭性断裂及其次级断裂的控制;区內岩(矿)石电性差异较显著,圈定的激电异常呈北西向带状展布,与以Pb、Zn、Ag、As、Sb、Au、Hg等为组合特征的土壤地球化学异常、矿化构造带吻合,通过分析物、化探异常发现了矿体;提出了地质—地球物理—地球化学综合找矿标志。

THE DISCOVERY OF THE DAIJIAZHUANG Zn-Pb DEPOSIT IN TANCHANG COUNTY,GANSU PROVINCE AND THE EFFECTS OF GEOPHYSICAL-GEOCHEMICAL PROSPECTING METHODS

The ores in the Daijiazhuang Zn-Pb deposit in Tanchang County of Gansu Province are mainly of the oxidation type and the ore bodies are hosted by bioclastic limestone and silicalite formed in shallow-sea facies and biohermal facies. Ore bodies are controlled by NW-trending tenso-shear faults and their subsidiary fractures. The electrical properties of the rocks and ores are obviously different and the determined IP anomalies are distributed along the NW-trending belt. All this is consistent with the results of Pb, Zn, Ag, As, Sb, Au and Hg soil geochemical measurements. Based on geophysical and geochemical studies, the authors found some ore bodies and put up the geological-geophysical-geochemical prospecting criteria.