地面高精度磁测和电磁测深在矿产调查中的应用  

The application of high precision ground magnetic and electromagnetic sounding in the mineral resources survey

作　　者：李富 刘鑫明[2] 廖国忠 王桥 焦彦杰 

机构地区：[1]成都地质调查中心,成都610082 [2]中国矿业大学资源学院,徐州221116

出　　处：《地球物理学进展》2013年第1期427-433,共7页Progress in Geophysics

基　　金：云南武定地区铁铜矿远景调查项目(1212011120640)资助

摘　　要：武定地区的各地层与矿体具有明显的磁性和电性差异,为了查明矿区内的控矿构造及外围矿致异常,开展了11万高精度磁法测量和大地电磁测量工作.对获取ΔT磁测数据进行化极和延拓等处理;对化极成果和不同延拓高度的成果综合对比分析,圈定了5个磁异常体和3条断裂,确定3号磁异常为有利矿致异常.在3号磁异常处开展大地电磁测深工作,查明断裂构造的产状、延伸,并对地层进行详细的分层.结合地质资料、电磁测深的成果资料,建立地质一地球物理模型,用RGIS2010软件对磁测剖面数据进行2.5D的人机联合反演,拟合出矿体的形态特征,得出异常体的相对深度、宽度和厚度,为地质找矿提供了有利的地球物理依据.Wuding area around the layer and the ore body has the magnetic and electrical differences, in order to identify the area of ore controlling structure and peripheral ore induced abnormalities, launched 1：1 million high precision magnetic survey and magnetotelluric surveying work. On the acquisition of AT of magnetic survey data in the pole and the continuation of treatment; to extreme outcomes and different continuation height outcome of comprehensive analysis, the delineation of 5 magnetic anomaly body and 3 faults, identifying 3 magnetic anomaly favorable ore induced abnormal. In 3 magnetic anomaly section of the magnetotelluric sounding, identify the fault occurrence, extension, and strata detailed stratification. Combined with geological information, electromagnetic sounding data, the establishment of geological geophysical model, using RGIS2010 software for 2. 5D magnetic profile data of human joint inversion, fitting out of the morphological characteristics, draw abnormal body relative to the depth, width and thickness, the geological prospecting provides favorable geophysical basis.

关 键 词：高精度磁法 电磁测深 拟合反演 地质填图 

分 类 号：P631[天文地球—地质矿产勘探]