内蒙古索家沟银多金属矿床是近年来在内蒙古中部玄武岩覆盖区发现的隐伏大型矿床,估算银金属量1400 t,铅+锌金属量28万 t.该隐伏矿床的成功发现得益于地球物理方法的合理运用,即在综合研究区域地质、矿产、物化探成果的基础上,优选成矿有利的玄武岩覆盖区,通过1∶1万地面高精度磁测量及1∶5千双频激电剖面测量圈出玄武岩覆盖区成矿有利部位,结合可控源音频大地电磁测深(CSAMT)、频谱激电测深(SIP)对深部矿化特征进行剖析,经钻探验证发现了隐伏银多金属矿体.本文剖析了索家沟矿床地球物理特征,推测了深部异常极化体延展情况,预测银铅锌多金属矿化体往深部尚有较大延展空间,指出了进一步找矿前景.同时提出快速高效的地质-物探(高精度磁测-双频激电-CSMT-SIP)-钻探的优选找矿方法组合在覆盖区找矿具有较好的应用价值.
The Suojiagou Ag polymetallic deposit in Inner Mongolia is a large concealed deposit discovered in the basalt-covered area of central Inner Mongolia in recent years,with an estimated amount of 1400 t Ag and 280 000 t Pb + Zn.The successful discovery of the concealed deposit is due to the rational application of geophysi-cal methods,that is,on the basis of comprehensive study of regional geological,mineral,physical and chemical exploration results,the favorable metallogenic metallogenic area of the basalt covered area is selected,and the favorable metallogenic location of the basalt covered area is delineated by 1∶10000 high-precision ground magnetic survey and 1∶5000 dual-frequency IP profile survey.Combined with controlled source audio magnetotelluric sound-ing(CSAMT)and spectrum IP sounding(SIP),the characteristics of deep mineralization were analyzed,and the hidden silver polymetallic ore body was found after drilling verification.In this paper,the geophysical characteristics of the Suojiagou deposit are analyzed,and the extension of the deep anomalous polarizing body is inferred.It is predicted that the silver,lead and zinc polymetallic mineralized body has a large extension space to the deep,and the prospect of further prospecting is pointed out.At the same time,it is proposed that the combina-tion of fast and efficient geological geophysical exploration(high-precision magnetic survey-dual-frequency IP-CSMT-SIP)-drilling optimization prospecting method has good application value in the covered area prospecting.