大功率激发极化法在拉拉铜矿落凼北部找矿中的应用

四川省拉拉铜矿落凼矿床是我国典型的大型露天铜多金属矿床。工区位于四川省拉拉铜矿落凼矿床北部。虽然前人在拉拉铜矿进行过激发极化法勘探工作，但是一直效果不佳。为了研究该方法在拉拉铜矿的有效性，在充分研究工作区的地质、地球物理特征基础上，采用大功率激发极化法中间梯度装置与激发极化法测深相组合的勘探方法模式进行勘探研究。通过分析激发极化法异常的平面分布特征与激发极化法测深异常特征，发现这些激电异常与已知地质成果基本吻合，证实了大功率激发极化法勘探在拉拉铜矿区是有效的。通过分析激发极化法异常特征，认为拉拉铜矿具有高极化-中低阻率的激发极化异常特征。此研究为激发极化法在拉拉铜矿地区的开展提供了有力的依据。

Application of High-Power Induced Polarization Method on the North Part of the Luodang Deposit in Lala Copper Mining Area

The Luodang deposit of the Lala copper mining area is a typical and large open-pit copper polymetallic deposit in Sichuan Province.The working area is located in the north part of the Luodang deposit of the Lala copper mining area. Although the predecessors had used the induced polarization method to carry out the exploration work in the Lala copper mining area,but the exploring effect was always not very well.In order to study the availability ofinduced polarization method in the Lalamining area, the combination exploration method about themiddle-gradient of high-power induced polarization and theinduced polarization sounding has been used in the test work of this deposit, according to the analysis and study of the geological and geophysical characteristic in the area. Through analyzing the plane and sounding abnormal distribution characteristics of induced polarization method, it's found that these IP abnormal is match to the result of geological in general, proving that the exploration of high-power induced polarization method is effective in the LaLa copper mining area. After analyzing and studying the abnormal characteristics of induced polarization method,it's thought that the Lala copper mining area has the characteristics of high polarizability and middle-low resistivity.At last, this paper provides a powerful gist for carrying out the induced polarization method in Lala copper mining area.