音频大地电磁测深法在甘肃石青硐多金属矿区深部探测中的应用  

Application of Audio MagnetoTelluric in Deep Exploration of Shiqingdong Polymetallic Mining Area in Gansu

作　　者：白运[1,2] 冀显坤 郭伟立[1,2] BAI Yun;JI Xian-kun;GUO Wei-li(Xi'an Center of Geological Survey,China Geological Survey,Xi'an 710054,China;Northwest China Center for Geoscience Innovation,Xi'an 710054,China)

机构地区：[1]中国地质调查局西安地质调查中心,西安710054 [2]西北地质科技创新中心,西安710054

出　　处：《价值工程》2022年第24期155-158,共4页Value Engineering

基　　金：商丹-大柴旦地区区域地质调查(编号:DD20190069)资助。

摘　　要：甘肃石青硐多金属矿区位于北祁连块状硫化物矿床成矿的有利地段,在该区开展音频大地电磁测深(AMT)工作的目的是探测矿区2km以内的地层、岩体的构造特征以及含矿构造的电性特征,为深部找矿提供相关的地球物理依据。野外采集的AMT数据,经预处理、定性分析、二维反演得到了视电阻率随深度变化的断面图,通过对比分析AMT剖面反演图,揭示了研究区内大理岩、酸性火山岩、矿体的空间分布情况,建立了地层与电阻率的对应关系;发现了一处有成矿前景的异常。研究结果表明:AMT在该区取得了较好的应用效果,为深部找矿提供地球物理方法技术支撑。The Shiqingtong polymetallic mining area in Gansu is located in the favorable area of the North Qilian massive sulfide deposit.The purpose of the audio magnetotelluric sounding(AMT)work in this area is to detect the structural characteristics of strata and rock masses within 2km of the mining area and the electrical characteristics of ore-bearing structures,to provide relevant geophysical basis for deep prospecting.After preprocessing,qualitative analysis and two-dimensional inversion of the AMT data collected in the field,a cross-sectional view of apparent resistivity varying with depth is obtained.By comparing and analyzing the AMT profile inversion map,the spatial distribution of marble,acid volcanic rock and orebodies in the study area was revealed,and the corresponding relationship between strata and resistivity was established;an anomaly with metallogenic prospect was found.The research results show that AMT has achieved good application effect in this area,providing geophysical method and technical support for deep ore prospecting.

关 键 词：石青硐 铅锌矿 电性结构 音频大地电磁测深 反演 深部探测 

分 类 号：P631[天文地球—地质矿产勘探]