可控源音频大地电磁法在高楼山金矿深部找矿中的应用

摘要

高楼山金矿位于甘肃省文县地区，金矿脉主要赋存于下泥盆统，赋存岩石主要为黄铁矿化较强的低阻破碎蚀变千枚岩。常规直流电法在矿区施工时存在低阻屏蔽和勘探深度太浅的问题，难以满足深部找矿的需求。而可控源音频大地电磁法（CSAMT）以大地电磁（MT）法为基础，具有抗干扰能力强、勘探深度大、布设极距小以及对地形要求较低等诸多优点，因此被广泛应用于固体矿产勘探中。结合早期在矿化密集区域布设的1条 CSAMT 剖面，寻找地下低阻破碎蚀变带的位置，并开展异常钻孔验证结果表明，该方法在高楼山金矿深部找矿中切实有效，为在高楼山金矿大规模使用提供了依据。%The gold veins of Gaoloushan gold mine in Wenxian,Gansu Province primarily located at the lower Devonian strata,and the characteristic of ore rock occurrence is consisted of low resistance and broken alteration phyllite with highly pyritization.Because direct-current electricity can not penetrate carbonaceous strata and its underground transmission is not deep enough,also it is hard to meet in-depth exploration needs. However,the Controlled Source Audio-frequency Magnetotelluric Method(CSAMT)based on the Magnetotelluric (MT)Method,with a strong anti-jamming capability,greater exploration depth,small layout pole pitch,and other advantage such as lower requires terrain,was extensively applied in the solid mineral exploration.We designed a CSAMT profile in mineralized zone with the earlier geological data so as to find the location of the fracture and alteration phyllite,and then it provided some evidence to in-depth drill and decreased its costs.After comparing with the drill results,obviously,CSAMT is an effective way for in-depth exploration in the Gaoloushan gold mine.