“大塘坡式”锰矿床电法勘探找矿标志与应用效果分析  

The prospecting criteria of electrical survey in finding'Datangpo'type manganese deposits and the analysis of it's application effect

作　　者：孔凡涛 张予杰[2] 闵刚[1,3] 张解成 蔡盼盼 KONG Fantao;ZHANG Yujie;MIN Gang;ZHANG Xiecheng;CAI Panpan(College of Geophysics, Chengdu University of Technology, Chengdu 610059, China;Chengdu Center of Chia Geological Survey,Chengdu 610081,China;Key Laboratory of Earth Exploration and Information Technology of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]成都理工大学地球物理学院,成都610059 [2]中国地质调查局成都地质调查中心,成都610081 [3]成都理工大学地球勘探与信息技术教育部重点实验室,成都610059

出　　处：《物探化探计算技术》2020年第3期368-375,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目(121201010000160904);国家自然科学基金项目(41274078)。

摘　　要：研究区位于贵州松桃锰矿区,该区锰矿产出于南华裂谷盆地形成过程中的次级拉张、断陷盆地。收集整理的岩石物性资料表明:研究区深部总体呈现为高阻-低阻-高阻的三层电性结构,含锰岩系位于第二电性层、第三电性层的过渡带,确定了电法勘探中的锰矿找矿标志。横跨成锰槽盆的音频大地电磁反演结果显示:成锰槽盆深部电性特征为高阻-低阻-高阻三层电性结构特征,与岩石物性分析结果一致。依据锰矿找矿标志对反演结果进行了地质解释,解释结果与钻井资料揭示的深部结构吻合,验证了反演解释的正确性。The study area is located in the Songtao Manganese Mine Area of Guizhou Province.The manganese ore deposits in this area are produced in the secondary extension and fault basins during the formation of the Nanhua Rift Basin.The analysis of the collected petrophysical data shows that the underground of the study area is generally a three-layered electrical structure with high-to-low resistance.The manganese-bearing rock system is located in the transition zone between the second and third electrical layers,and its electrical prospecting criteria is determined.The results of audio magnetotelluric inversion across the manganese basin show that the deep electrical characteristics of the manganese tank are high-to-low resistance three-layered electrical structure,which is consistent with the petrophysical analysis results.The inversion results were geologically interpreted,according to the electrical prospecting criteria,and the interpretation results are consistent with the deep structure revealed by the drilling data,which verified the correctness of the inversion interpretation.

关 键 词：音频大地电磁 锰矿 贵州松桃锰矿区 找矿标志 

分 类 号：P631.3[天文地球—地质矿产勘探]