汤井田^1,2,,
张林成^1,2,
王显莹^3,,,
任政勇^1,2,
周聪^1,2,
赵文广⁴,
吴明安⁴
1. 中南大学有色金属成矿预测教育部重点实验室, 长沙 410083
2. 中南大学地球科学与信息物理学院, 长沙 410083
3. 中国科学院大学地球与行星科学学院, 中国科学院计算地球动力学重点实验室, 北京 100049
4. 安徽省地质调查院, 合肥 230001

基金项目: 国家自然科学基金（41574120，41474103），国家高技术研究发展计划（2014AA06A602），中国地质调查项目（1212011120857），青年973项目（2015CB060200），中南大学创新驱动项目（2016CX005）和中南大学猎英人才计划联合资助


详细信息

作者简介: 汤井田, 男, 1965年生, 教授, 主要从事电磁法理论与应用研究.E-mail:jttang@csu.edu.cn

通讯作者: 王显莹, 男, 1982年生, 博士, 主要从事大地电磁法探测研究.E-mail:xianyingwang@ucas.ac.cn

中图分类号: P631

收稿日期:2017-05-13
修回日期:2018-01-25
上线日期:2018-04-05

Subsurface electrical structure of the Fanshan-Jiangjunmiao area in the Lujiang-Zongyang Ore District derived from 3-D inversion of audio-magnetotelluric data

TANG JingTian^1,2,,
ZHANG LinCheng^1,2,
WANG XianYing^3,,,
REN ZhengYong^1,2,
ZHOU Cong^1,2,
ZHAO WenGuang⁴,
WU MingAn⁴
1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, Changsha 410083, China
2. School of Geosciences and Info-physics, Central South University, Changsha 410083, China
3. College of Earth and Planetary Sciences University of Chinese Academy of Sciences, Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China
4. Anhui Province Geological Survey, Heifei 230001, China


More Information

Corresponding author: WANG XianYing,E-mail:xianyingwang@ucas.ac.cn

MSC: P631

--> Received Date: 13 May 2017
Revised Date: 25 January 2018
Available Online: 05 April 2018


摘要
摘要:庐江—枞阳矿集区是长江中下游成矿带内的一个重要的多矿种成矿区.为揭示矾山—将军庙地区的地质结构以指导找矿，首先，在庐枞矿集区北部的矾山—将军庙地区开展了三维音频大地电磁数据采集工作，采用Rhoplus方法进行AMT数据死频带校正保证数据质量，利用相位张量分析地下介质的维性特征；其次，利用模块化三维反演并行代码ModEM开展了实测数据的三维反演，获得了一个典型的具有双层结构特征的火山岩盆地三维地下电性模型；最后通过电性模型及其他地质资料的综合解释，依据反演模型中近地表的低阻层和深部的高阻隆起区，分别勾画出了火山岩地层的厚度和深部侵入岩的分布范围，并在小岭地区发现地表浅部下方存在一个含矿次级火山机构的高导体.
关键词: 庐枞矿集区/
音频大地电磁法/
三维反演/
电性模型

Abstract:The Lujiang-Zongyang ore district is an important polymetallic ore deposit district in the Middle and Lower Reach of Yangtze Metallogenetic Belt. In order to reveal the geological structure of the Fanshan-Jiangjunmiao area, a part of the Lujiang-Zongyang ore district, a 3-D audio magnetotelluric (AMT) data acquisition was carried out. The Rhoplus technique was applied to correct the distorted data caused by AMT high-frequency dead-band for guaranteeing the data quality, and the dimensional characteristics of underground media were analyzed using the phase tensor method. Then, a 3-D inversion of the data was carried out by a modular code which is referred to as ModEM. Through 3-D inversion, a high-resolution 3-D electrical resistivity model was established.
The study area is a two-layer structure of a volcanic basin. Combined with geological data, the 3-D inversion results show that the main features in the electrical resistivity model corresponded well to the known geological features and the near-surface conductive layers and high-resistivity uplift zones at depth, which delineate the thickness of volcanic formation and distribution of intrusions. Meanwhile, a near-surface high-conductive body was found beneath the Xiaoling Mountain, which was considered to be an ore-bearing secondary volcanic edifice.
Key words:Lujiang-Zongyang Ore District/
Audio magnetotellurics/
3-D inversion/
Geoelectrical structure



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