湘中地区锰矿地质—地球物理(AMT)模型的研究及应用  

Research and Application of Geological-Geophysical(AMT)Model ofManganese Deposits in Central Hunan Province

作　　者：杨龙彬 肖明顺 丛源[2] 高宝龙 李朗田 Yang Longbin;Xiao Mingshun;Cong Yuan;Gao Baolong;Li langtian(Central South Geological Survey Institute of China Metallurgical Geology Bureau,Wuhan,Hubei 430080;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037)

机构地区：[1]中国冶金地质总局中南地质调查院,湖北武汉430080 [2]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《资源环境与工程》2022年第5期691-700,共10页Resources Environment & Engineering

基　　金：上扬子东南缘锰矿调查评价(WKZB1911BJM500332)。

摘　　要：通过对湖南省桃江县文家湾、湘潭市九潭冲两个地区的岩矿石标本电性数据特征分析,结合地质、钻孔资料,建立了两个地区地层从浅到深呈“高—低—高”特征的地电模型。通过两个地区的五条音频大地电磁(AMT)剖面成果对含锰岩系及隐伏构造的空间形态及展布特点进行分析、解释,笔者认为文家湾地区奥陶系中统磨刀溪组含矿层主要沿志留系新滩组下界面的高阻梯度带延伸,九潭冲地区南华系大塘坡组页岩含矿层主要沿板溪群顶界面的高阻梯度带延伸,并建立相应的地质—地球物理模型,为后续钻探工程布置提供依据。同时认为先采用AMT成果勾勒褶皱空间形态,再以钻探工程验证,地质与物探相结合是探索覆盖区和隐伏区深部构造特征的有效方法。This paper analyzes the electrical data characteristics of rock and ore samples in Wenjiawan and Jiutanchong areas of Taojiang County and Xiangtan City,Hunan Province,and combines geological and drilling data to establish a geoelectric model of the strata in the two areas from shallow to deep with the characteristics of“high-low-high.”Through the results of five audio magnetotelluric(AMT)sections in the two areas,the spatial morphology and distribution characteristics of manganese bearing rock series and concealed structures in the two areas are analyzed and explained.The author believes that the manganese bearing layer of Modaoxi Formation of Middle Ordovician in Wenjiawan area of Taojiang mainly extends along the high resistivity gradient zone at the lower interface of Xintan Formation of Silurian System,and the manganese bearing layer of shale of Datangpo Formation of Nanhua System in Jiutanchong area mainly extends along the high resistivity gradient zone at the top interface of Banxi Group,and establishes the corresponding geological-geophysical model to provide basis for the layout of subsequent drilling projects.At the same time,it is considered that the effective method to explore the deep structural characteristics of the covered area and hidden area is to use AMT results to outline the spatial shape of folds,and then verify with drilling engineering,and combine geology and geophysical exploration.

关 键 词：锰矿 地电模型 AMT 隐伏构造 地质—地球物理模型 湘中地区 

分 类 号：P618.32[天文地球—矿床学] P631.3[天文地球—地质学]