沈小庆,杨炳南,周琦,张德实,何帅,沈红钱,何永川.音频大地电磁法对黔东高地锰矿床电性结构及犁式正断层的识别[J].贵州地质,2021,38(2):152-160
音频大地电磁法对黔东高地锰矿床电性结构及犁式正断层的识别
Identification of Audio Magnetotellurics to the Electrical Structure and Plough-type Normal Fault of Gaodi Manganese Deposit in Eastern Guizhou
投稿时间:2021-01-03  
DOI:
中文关键词:  高地锰矿  犁式正断层  音频大地电磁法  电性结构  贵州
英文关键词:Gaodi manganese deposit  Plough-type normal fault  Audio magnetotelluric  Electrical structure  Guizhou
基金项目:贵州省重点矿产资源大精查松桃县高地锰矿勘探项目、贵州省锰矿资源预测评价科技创新人才团队(编号:黔科合平台人才[2018]5618)、贵州省科技计划项目(编号:黔科合支撑[2019]2868、黔科合平台人才[2019]5654)、贵州省地矿局地质科研项目(编号:黔地矿科合[2019]2号)联合资助。中国地质调查局发展研究中心《贵州铜仁松桃锰矿矿集区矿产地质调查(大湾地区)》项目(编号:中地调研合同[2020]第284号)
作者单位
沈小庆 贵州省地矿局103地质大队贵州铜仁554300
自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081 
杨炳南 贵州省地矿局103地质大队贵州铜仁554300
自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081
中国地质大学武汉地球物理与空间信息学院湖北武汉430074 
周琦 自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081
贵州省地质矿产勘查开发局贵州贵阳550003 
张德实 贵州省地矿局103地质大队贵州铜仁554300
自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081 
何帅 贵州省地矿局103地质大队贵州铜仁554300
自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081 
沈红钱 贵州省地矿局103地质大队贵州铜仁554300
自然资源部基岩区矿产资源勘查工程技术创新中心贵州贵阳550081 
何永川 贵州省地矿局104地质大队贵州都匀558000 
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中文摘要:
      黔东高地锰矿是我国第一个特大型富锰矿床,也是黔东地区典型的南华纪“大塘坡式”沉积型锰矿床。区内主要断裂构造为犁式正断层(F3),该断层对区内锰矿层的保护与破坏具有重要影响,其空间展布特征以及与含锰岩系接触关系的勘查分析对区内找矿预测尤为重要。为了识别犁式正断层在地下深部的展布特征,调查其对含锰岩系的破坏程度,采用音频大地电磁法(AMT)对研究区地下电性结构特征和断裂构造进行研究。在物性分析的基础上,结合钻孔揭露的地层信息,建立了简单的正断层理论模型,采取不同的反演模式对理论模型进行反演计算,经对比分析,优选出了区内二维反演模式。通过实测AMT数据反演,查明了剖面电性结构特征。结合钻孔工程控制,有效的识别了犁式正断层在剖面上呈上陡下缓的展布特征。推测F3断层未对含锰岩系造成破坏,为研究区锰矿深部找矿提供了地球物理支撑。
英文摘要:
      The Gaodi manganese deposit in east Guizhou is the first super-large manganese deposit in China and a typical Datangpo type deposit of Nanhua period in eastern GuizhouThe main fault structure in the area is the plough-type normal fault(F3),which has an important influence on the protection and destruction of the manganese deposits in the areaThe spatial distribution characteristics of the fault and the exploration analysis of the contact relationship between the fault and the manganese bearing rock series are particularly important for the prospecting prediction in the areaIn order to identify the distribution characteristics of plough-type normal fault in deep underground and investigate the damage degree of the plough-type normal fault to the manganese-bearing rock system,the characteristics of underground electrical structure and fault structure in the study area were studied by audio magnetotellurics(AMT)Based on the analysis of physical properties and the stratigraphic information revealed by borehole,a simple theoretical model of normal fault was established,and different inversion modes were used to calculate the theoretical modelThrough comparative analysis,the best two-dimensional inversion mode is selectedThrough the inversion of the measured AMT data,the characteristics of the profile electrical structure are found outCombined with drilling engineering control,the plough-type normal fault is effectively identified in the profile as upper steep and lower gentle distribution characteristicsIt is speculated that the F3 fault does not damage the manganese-bearing rock series,which provides geophysical support for deep prospecting of manganese deposits in the study area
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