激发极化法在西非加纳某锰矿勘查中的应用

Application of induced polarization method in the exploration of a manganese deposit in Ghana,west Africa

针对热带雨林地区植被覆盖广、地质露头少,传统地质找矿手段难以发挥作用的问题,本文提出利用地球物理方法探查隐伏锰矿体的思路。在分析在产矿山地质特点与地球物理特征基础上,首次将激发极化法应用到加纳西部省某锰矿增储勘查中,通过圈定激电中梯剖面低阻高极化异常确定矿体平面位置,再利用激电测深中相对高阻高极化异常判断碳酸锰矿体位置及展布形态。分析显示推断矿体位置锰含量高达40.99%,证明了方法的有效性,对同类型锰矿勘查工作具有指导意义。

In order to solve the problem that the traditional geological prospecting method is difficult to play a role due to the wide vegetation coverage and few geological outcrops in tropical rain forest,this paper puts forward the idea of exploring hidden manganese ore body by geophysical method.Based on the analysis of the geological and geophysical characteristics of the producing mine,the induced polarization method was applied to the exploration of a manganese deposit in western Province of Ghana for the first time.The plane position of the ore body was determined by defining the low resistance and high polarization anomaly of the IP midladder section,and the relatively high resistance and high polarization anomaly in the IP sounding was used to determine the location and distribution pattern of manganese carbonate ore body.The analysis shows that the manganese content of the ore body is as high as 40.99%,which proves the effectiveness of the method and has guiding significance for the exploration of the same type of manganese ore.