通过激电异常分析圈定找矿靶区——以承德庞家沟银多金属矿区为例

承德庞家沟银多金属矿主要与中生代早白垩世大北沟期陆相火山活动有关,火山管道相附近构造有利部位和岩性物性差异界面为成矿有利部位。通过对研究区的物探异常特征进行研究,重点分析了该区域岩(矿)石电性特征、激电中梯异常特征和激电测深剖面异常特征,并结合该区域地质背景与资料,综合圈定成矿远景区。研究结果表明: 研究区岩(矿)体之间物性差异明显,电阻率与极化率异常可作为重要的地球物理找矿间接标志; 研究区内以近EW向构造为主,同时发育NS、NE和NW向断层。基于激电异常分析方法,在该区域共圈定6个靶区,IP1南段异常是寻找金矿的有利地段, IP6异常存在于银铅锌矿体中,为该区域的进一步找矿提供参考。

Analysis of induced polarization anomaly for prospecting potentiality:A silver poly-metallic mine in Pangjiagou of Chengde

The study area is a silver poly-metallic mine in Chengde, mainly related to volcanic activities which is continental facies in the Mesozoic Early Cretaceous Dabeigou period, and the mineralization areas are usually near volcanic pipes in favorable structural parts and lithology altered parts. In this paper, combined with the geological background and materials, the geophysical characteristics of the mine were studied and analyzed comprehensively. The results show that, resistivity and polarization anomalies are considered as important indirect geophysical prospecting signs. According to induced polarization anomaly, the EW structures exist widely in the study area, then NS, NE and NW structures. Six regions (IP1-IP6) are forecasted preliminarily as the target areas, of which the anomaly southern section of IP1 is the favorable region for gold mine, and the abnormalities of IP6 may have close relationships with the silver, lead and zinc ore bodies. Therefore, this research can be as a reference for prospecting in the future.