大功率激电三极测深在蚂蝗沟铅锌矿勘查中的应用

The Application of IP Three-Pole Sounding to the Exploration of Mahuanggou Pb-Zn Deposit

蚂蝗沟铅锌矿位于八方山-八卦庙矿集区北部,成矿地质环境和构造条件十分有利。铅锌矿体赋存于灰岩与千枚岩接触界面附近,受背斜构造控制。本次开展的激电三极测深工作,圈定的高阻异常确定了背斜核部隐伏灰岩的位置与分布特征。灰岩北侧获得的高极化率异常位于灰岩与千枚岩接触带附近,与地表已发现铅锌矿体位置对应较好,由此认为灰岩南部的高极化率异常也由矿体引起。在80线布设钻孔ZK80A01,在340 m附近出现铜矿化体,综合分析认为高极化率异常与铜矿化体有关。激电三极测深是该地区寻找铅锌铜矿的有效物探方法。

Mahuanggou Pb-Zn deposit is located in the north of Bafangshan-Baguamiao mine concentration area,the metallogenic geological environment and tectonic conditions are good.Ore bodies occur near the contact interface between limestone and phyllite,controlled by anticline structure.The IP three-pole sounding work,high resistivity anomaly reflects the location and distribution characteristics of concealed limestone in the core of anticline.The high polarizability anomaly on the north side of limestone is located near the contact zone between limestone and phyllite,it corresponds well to the position of ore bodies found on the surface.Therefore,it is considered that the high polarizability anomalies in the south of limestone are also caused by ore bodies.Drilling ZK80A01 in line 80,copper mineralization occurs near 340 meters.Comprehensive analysis shows that high polarizability anomalies are related to copper mineralization bodies.We suggest that the IP three-pole sounding is an effective geophysical method for finding Pb-Zn deposits in this area.