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安庆-贵池矿集区及邻区深部电性结构研究

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王刚, 方慧, 仇根根, 黄继民. 2019. 安庆-贵池矿集区及邻区深部电性结构研究[J]. 中国地质, 46(4): 795-806. doi: 10.12029/gc20190410
引用本文: 王刚, 方慧, 仇根根, 黄继民. 2019. 安庆-贵池矿集区及邻区深部电性结构研究[J]. 中国地质, 46(4): 795-806. doi: 10.12029/gc20190410
shu
WANG Gang, FANG Hui, QIU Gengen, HUANG Jimin. 2019. The deep electrical structure across Anqing-Guichi ore concentration area[J]. Geology in China, 46(4): 795-806. doi: 10.12029/gc20190410
Citation: WANG Gang, FANG Hui, QIU Gengen, HUANG Jimin. 2019. The deep electrical structure across Anqing-Guichi ore concentration area[J]. Geology in China, 46(4): 795-806. doi: 10.12029/gc20190410
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安庆-贵池矿集区及邻区深部电性结构研究

  • 1.

    中国地质科学院地球物理地球化学勘查研究所, 河北 廊坊 065000

  • 2.

    武警黄金第三支队, 黑龙江 哈尔滨 150006

  • 基金项目:
    国家自然科学基金项目“江南造山带东段岩石圈三维电性结构研究”（41574068）、国家重点研发计划项目“华南北段地壳三维电性结构探测研究”（2016YFC0600201）、中国地质调查局地质调查项目“钦杭结合带及邻区深部地质调查”（121201108000160913，DD201682，DD20190012）“武夷山成矿带区域大地电磁测深”（12120114005801）、中国地质科学院基本科研业务费项目“江南造山带东段岩石圈结构的地震学成像研究”（AS2017J05）联合资助
详细信息
    作者简介: 王刚, 男, 1990年生, 博士, 工程师, 主要从事电磁法研究, E-mail:wanggang01@igge.cn

  • 中图分类号: P631.3

The deep electrical structure across Anqing-Guichi ore concentration area

  • 1.

    Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, Hebei, China

  • 2.

    No.3 Gold Geological Party, CAPF, Harbin 150006, Heilongjiang, China

  • Fund Project: National Natural Science Foundation (No. 41574068); National Key Research and Development Program (No. 2016YFC0600201), Geological Survey Project (No. 121201108000160913, DD201682, DD20190012, 12120114005801), Basic Scientific Research Project of Chinese Academy of Geological Sciences (No. AS2017J05)
More Information
    Author Bio: WANG Gang, male, born in 1990, doctor, engages in research on tectonics and geophysical exploration; Email:wanggang01@igge.cn .

    摘要

  • 长江中下游地区经历了多期次的地质构造演化具有丰富的矿产资源，对重要矿集区及其邻区的深部电性结构进行研究具有重要意义。通过对穿过安庆—贵池矿集区的一条宽频带大地电磁测深长剖面数据进行分频段以及分区反演，构建了覆盖大别造山带至下扬子地块东缘的二维电性结构模型。发现矿集区的深部电性结构与邻区的构造单元具有显著差异，大别造山带和江南隆起带与浙赣凹陷之间的地壳整体表现为高阻特征，而下扬子坳陷和江南隆起带之间存在岩石圈上地幔尺度的高导电异常体并且与地壳浅部的高导体相连。安庆—贵池矿集区的成矿机制主要为燕山期陆内俯冲以及早白垩时期的伸展作用，矿集区下地壳加厚、拆沉和上地壳丰富的断裂系统起到了重要的控矿作用。

    The middle and lower reaches of the Yangtze River have experienced multiple stages of geological evolution and are rich in mineral resources. In this paper, a two-dimensional electrical structure model covering the Dabie orogenic belt and the Lower Yangtze block was constructed by inverting a long magnetotelluric profile passing through the Anqing-Guichi ore concentration area by sub-band and sub-segment inversion scheme. According to the obtained electrical structure, the lithospheric structure beneath the ore concentration area is significantly different from that of the adjacent areas. Both the crusts under Dabie orogenic belt and between Jiangnan uplift belt and Zhegan depression are characterized by high resistivity, while the lithospheric upper mantle between Lower Yangtze depression and Jiangnan uplift belt is electrically conductive with a deep conductor extending upward to the conductors in the upper crust. The metallogenic mechanism of Anqing-Guichi ore concentration area was mainly the Yanshanian intra-continental subduction and the early Cretaceous extension deformation. The thickening and sinking of the lower crust and the abundant fault system in the upper crust underneath the ore concentration area may have played an important role in mineralization.

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  • 图 1  地质构造图和测点分布（背景图通过GMT绘制）

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  典型测点的视电阻率和相位曲线(点位见图 1)

    Figure 2. 

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    图 3  沿剖面的Bahr二维偏离度分布图

    Figure 3. 

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    图 4  全剖面与分区段电性主轴分析结果的差异

    Figure 4. 

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    图 5  江南断裂西北侧（a~d）和东南侧（e~h）数据分别在0.1~1 s、1~10 s、10~100 s、100~3000s频段的统计结果

    Figure 5. 

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    图 6  不同反演策略的结果

    Figure 6. 

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    图 7  综合解释图

    Figure 7. 

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收稿日期:  2019-03-18
修回日期:  2019-06-11
刊出日期:  2019-08-25

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