激发极化法和可控源音频大地电磁法在黔西北铅锌矿勘查中的综合应用  

Comprehensive application of induced polarization method and controlled source audio magnetotelluric method for the exploration of Pb-Zn deposits in Northwest Guizhou

作　　者：焦智伟 艾虎[1,2] 李英宾 汪来 JIAO Zhiwei;AI Hu;LI Yingbin;WANG Lai(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050000,Hebei,China;CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource,Shijiazhuang 050000,Hebei,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050000 [2]中核集团铀资源地球物理勘查技术中心(重点实验室),河北石家庄050000

出　　处：《矿产与地质》2020年第5期962-968,共7页Mineral Resources and Geology

基　　金：贵州省地质矿产勘查开发局“贵州省威宁县云贵—觉乐地区铅锌矿找矿突破战略选区物探测量”(编号:201713)项目资助。

摘　　要：黔西北铅锌成矿区是川—滇—黔铅锌矿集区的重要组成部分,成矿条件优越,具有较好的找矿前景。由于区域地质构造复杂,深部找矿难度大,为快速查明隐伏矿体和控矿构造发育情况,开展综合物探十分必要。在研究区应用激发极化法和可控源音频大地电磁法进行综合测量,首先通过激电中梯扫面快速查明异常体平面分布,运用激电测深查明异常体埋深、规模,结合可控源音频大地电磁测量查明控矿构造深部发育情况。应用表明:黔西北铅锌矿地球物理特征在激电中梯等值线平面图和激电测深图上表现为高充电率、低电阻率特征,在CSAMT电阻率断面图上表现为断裂夹持部位,在铅锌矿勘查中取得了较好的效果,为相关地区的铅锌矿勘查提供了借鉴。The lead-zinc metallogenic area in Northwest Guizhou is an important part of the Sichuan-Yunnan-Guizhou lead-zinc ore concentration region,in which there are the superior metallogenic conditionand good prospecting persperctive.Because of the complexity of regional and geological structures and the difficulty of deep prospecting,it is necessary to carry out the comprehensive geophysical exploration in order to find out the concealed orebody and ore-controlling structurequickly.In the study area,the induced polarization method(IP)and the controllable source audio magnetotelluric method(CSAMT)are used in the comprehensive geophysical survey.Firstly,the plane distribution of the anomalies is quickly identified throughthe IP middle ladderarea survey,the buried depth and scale of the geophysical anomalies are found out by the IP sounding survey,and the deep ore-controlling structure is found out for CSAMT survey.The application shows that the geophysical characteristics of the lead-zinc deposits in Northwest Guizhou are presented as high charging rate and low resistivity in the IP middle ladder contour map and IP sounding map.The fault clamping position is shown in the CSAMT resistivity cross-section map.The comprehensive geophysical methods have achieved a good result in the exploration of lead-zinc deposit and might provide a guiding reference for the exploration of lead-zinc deposit in the relevant areas.

关 键 词：铅锌矿 激发极化法 可控源音频大地电磁法(CSAMT) 黔西北 

分 类 号：P631.3[天文地球—地质矿产勘探] P618.42[天文地球—地质学]