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引用本文:张昆,吕庆田,严加永,赵金花. 安徽庐江-枞阳矿集区典型铜、铁矿床三维电性结构特征[J]. 中国地质, 2019, 46(4): 807-817.
ZHANG Kun,Lü Qingtian,YAN Jiayong,ZHAO Jinhua. The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area[J]. Geology in China, 2019, 46(4): 807-817(in Chinese with English abstract).
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安徽庐江-枞阳矿集区典型铜、铁矿床三维电性结构特征
张昆1,2, 吕庆田1,2, 严加永1,2, 赵金花1,2
1.中国地质科学院, 北京 100037;2.中国地质调查局-中国地质科学院地球深部探测中心, 北京 100037
摘要:
“玢岩型”铁矿和斑岩型铜矿是庐江—枞阳矿集区两个主要矿床类型,以往研究主要集中在矿床学、岩石学、年代学和地球化学等方面,地球物理工作开展相对较少。随着找矿深度不断加大,地球物理的作用越来越大。为建立典型矿床地球物理探测的解释“标尺”,笔者选择泥河铁矿和沙溪铜矿为研究对象,开展三维音频大地电磁测深工作,获得了典型铜、铁矿床及围岩的三维电性结构模型。结果显示,玢岩(泥河)铁矿电性主体表现为层状结构,由浅至深主要为低阻的沉积层、高阻火山岩、相对低阻的蚀变带以及相对高阻的次火山岩,赋存于次火山岩体顶部穹隆状的磁铁矿主要表现为高阻特征。斑岩(沙溪)铜矿电性主体表现为块状(或纵向带状)结构,浅表为低阻沉积盖层,深部主要为相对高阻的沉积地层和高阻斑岩体,赋存于岩体内或围岩接触带的矿体则为中等电阻特征。为便于模型的实用,笔者将两类矿床的复杂电性模型转化为简化的概念电性模型,为寻找类似矿床提供快速对比“标尺”。
关键词:  庐江-枞阳矿集区  泥河铁矿  沙溪铜矿  音频大地电磁测深  三维反演  电性结构  深部资源工程
DOI:10.12029/gc20190411
分类号:P631.3
基金项目:中国地质调查局“深部地质调查工程”(DD20160082,DD20190012)与“十三五”国家重点研发计划“华南陆内成矿系统的深部过程与物质响应”(2016YFC0600201)联合资助。
The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area
ZHANG Kun1,2, Lü Qingtian1,2, YAN Jiayong1,2, ZHAO Jinhua1,2
1.Chinese Academy of Geological Sciences, Beijing 100037, China;2.SinoProbe Center, Chinese Academy of Geological Sciences and China Geological Survey, Beijing 100037, China
Abstract:
The porphyrite iron and porphyry copper ore deposits are the major deposit categories in the Lujiang-Zongyang ore concentration area. However, previous researches were mostly focused on mineralogy, petrology, geochronology and geochemistry, but paid less attention to geophysics. As the exploration depth is increasing, geophysical methods become more important. In order to develop the interpretation ‘scaleplate’ of the geophysical exploration for typical deposits, the authors took the Nihe iron and Shaxi copper ore deposits as the research subjects, and obtained the three-dimensional electrical models of the orebodies and the surrounding rocks through the audio-magnetotelluric sounding. The results indicate that the major structure of the porphyrite (Nihe) iron deposit is composed of several layers including low resistivity sedimentary rocks, high resistivity volcanic rocks, relatively low resistivity alteration zone and relatively high resistivity intrusive of subvolcanic rocks from shallow place to the depth. In addition, the magnetite body, which exists as a dome on the top of the mass, presents the characteristics of high resistivity. For the porphyry (Shaxi) copper deposit, the major electrical characteristics are the massive (or longitudinal belt) structures composed of the shallow sedimentary rocks with low resistivity, the deep sedimentary rocks with relatively high resistivity, and the porphyry mass with high resistivity. In addition, the orebodies,which exist in the mass or the contact zone between the mass and surrounding rocks, present electrical characteristics of medium resistivity. The orebodies hosted in the mass (or in the contact zone with surrounding rocks) present medium-resistivity. For the practicability of the models, the authors converted the inversion results with complex electrical structures into two facilitate models, which would be used as the comparative ‘scaleplate’ for the discovery of the similar deposits.
Key words:  Lujiang-Zongyang ore concentration area  Nihe iron deposit  Shaxi copper deposit  audio-magnetotellurics  threedimensional inversion  electrical structure  deep resources engineering