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物探与化探  2019, Vol. 43 Issue (6): 1211-1216    DOI: 10.11720/wtyht.2019.0137
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
高精度重磁测量在覆盖区找矿中的应用——以无为县蔚山铁铜矿预查为例
赵敏, 盛勇, 戚良刚
安徽省地球物理地球化学勘查技术院,安徽 合肥 230022
The application of high precision gravity and magnetic survey to prospecting in coverage area:A case study of the reconnaissance of Weishan iron and copper deposit in Wuwei County
Min ZHAO, Yong SHENG, Liang-Gang QI
Anhui Institute of Geophysical and Geochemical Prospecting Techniques, Hefei 230022, China
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摘要 

在覆盖区,常规的地质工作开展难度较大,而高精度重力、磁法测量方法能有效地进行隐伏断裂划分和岩体圈定,为覆盖区找矿提供重要帮助。笔者以安徽省无为县蔚山铁铜矿预查为例,通过对重磁异常的处理和分析,对预查区的断裂和岩体进行了划分和圈定;同时结合地质特征筛选了两处找矿潜力较大的重磁局部异常,经钻孔验证,在孔深260~50 m段累计见视厚度近40 m,TFe品位52%、mFe品位38%的富铁矿体。勘查成果对预查区所在的庐枞火山岩盆地东缘覆盖区的找矿工作具有一定的指导意义。

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赵敏
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关键词 覆盖区找矿高精度重磁测量2.5D重磁反演庐枞火山岩盆地    
Abstract

In the coverage area, it is very difficult to carry out the conventional geological work , whereas the high-precision gravity and magnetic survey methods can quickly and effectively divide the buried faults and determine the rock boundary, which provides important assistance for prospecting in the coverage area. With the Weishan iron-copper deposit reconnaissance in Wuwei County of Anhui Province as an example, the authors divided the faults and determined rock boundary in the pre-investigation area through the processing and analysis of gravity and magnetic anomalies. Combined with geological features, two gravity and magnetic anomalies with large potential for prospecting were screened where a 40 m rich iron orebody with a TFe grade of about 52% and a mFe grade of about 38% was found by drilling. Therefore, the effectiveness of the method is confirmed, and this result also has certain guiding significance for the prospecting work in the eastern marginal coverage area of the Luzong volcanic basin where the investigation area is located.

Key wordsprospecting in the coverage area    high precision gravity and magnetic survey    2.5D gravity and magnetic inversion    Luzong volcanic basin
收稿日期: 2019-03-13      出版日期: 2019-11-28
:  P631  
基金资助:安徽省地勘基金“安徽省无为县蔚山地区铁铜矿预查”项目(2011-2-9)
作者简介: 赵敏(1985-),男,物探工程师,主要从事地球物理勘查及研究工作。Email:151501372@qq.com
引用本文:   
赵敏, 盛勇, 戚良刚. 高精度重磁测量在覆盖区找矿中的应用——以无为县蔚山铁铜矿预查为例[J]. 物探与化探, 2019, 43(6): 1211-1216.
Min ZHAO, Yong SHENG, Liang-Gang QI. The application of high precision gravity and magnetic survey to prospecting in coverage area:A case study of the reconnaissance of Weishan iron and copper deposit in Wuwei County. Geophysical and Geochemical Exploration, 2019, 43(6): 1211-1216.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0137      或      https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1211
Fig.1  安徽省无为县蔚山地区地质
1—第四系;2—古近系;3—侏罗系罗岭组;4—侏罗系磨山组;5—三叠系东马鞍山组;6—泥盆系五通组;7—志留系茅山组;8—志留系坟头组;9—石英正长岩;10—正长岩;11—断裂;12—预查区
Fig.2  庐枞地区区域重、磁异常
1—Δg等值线;2—重力高;3—重力低;4—ΔT负等值线;5—ΔT零值线;6—ΔT正等值线;7—预查区
Fig.3  蔚山地区布格重力异常
Fig.4  蔚山地区ΔT化极异常
Fig.5  蔚山地区剩余重磁异常
1—剩余正磁异常;2—剩余重力高;3—剩余重力低;4—推断断裂;5—推断岩体;6—钻孔
Fig.6  11线2.5D重磁反演剖面
1—第四系;2—三叠系中统;3—三叠系下统-二叠系;4—二叠系栖霞组;5—石炭系;6—泥盆系-志留系;7—志留系中下统;8—安山玢岩;9—推断岩体;10—推断磁铁矿体;11—设计钻孔及编号
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