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宽频大地电磁法寻找“界面型”隐伏金矿床:以黔西南戈塘地区深部找矿为例

张伟, 曾昭光, 周军, 季国松, 徐学贵, 刘光磊, 陆建宝. 2023. 宽频大地电磁法寻找“界面型”隐伏金矿床:以黔西南戈塘地区深部找矿为例[J]. 中国地质, 50(2): 359-375. doi: 10.12029/gc20200207001
引用本文: 张伟, 曾昭光, 周军, 季国松, 徐学贵, 刘光磊, 陆建宝. 2023. 宽频大地电磁法寻找“界面型”隐伏金矿床:以黔西南戈塘地区深部找矿为例[J]. 中国地质, 50(2): 359-375. doi: 10.12029/gc20200207001
ZHANG Wei, ZENG Zhaoguang, ZHOU Jun, JI Guosong, XU Xuegui, LIU Guanglei, LU Jianbao. 2023. Broadband magnetotelluric (BMT) detecting blind gold deposits with interface-type: A case of deep prospecting in the Getang area, southwestern Guizhou[J]. Geology in China, 50(2): 359-375. doi: 10.12029/gc20200207001
Citation: ZHANG Wei, ZENG Zhaoguang, ZHOU Jun, JI Guosong, XU Xuegui, LIU Guanglei, LU Jianbao. 2023. Broadband magnetotelluric (BMT) detecting blind gold deposits with interface-type: A case of deep prospecting in the Getang area, southwestern Guizhou[J]. Geology in China, 50(2): 359-375. doi: 10.12029/gc20200207001

宽频大地电磁法寻找“界面型”隐伏金矿床:以黔西南戈塘地区深部找矿为例

  • 基金项目:
    中国地质调查局项目(DD20230238、DD20190033、DD20160082)和国家自然科学基金项目(41804144、42230311)联合资助
详细信息
    作者简介: 张伟, 男, 1983年生, 正高级工程师, 在职博士后, 主要从事金属矿产地球物理勘探与软件研发; E-mail: dr.zhangwei@qq.com
    通讯作者: 周军, 男, 1981年生, 助理研究员, 主要从事地球电磁探测方法与应用研究; E-mail: 20947936@qq.com
  • 中图分类号: P611.1;P622.6

Broadband magnetotelluric (BMT) detecting blind gold deposits with interface-type: A case of deep prospecting in the Getang area, southwestern Guizhou

  • Fund Project: Supported by the projects of China Geological Survey (No.DD20230238, No.DD20190033, No.DD20160082) and the National Natural Science Foundation of China (No.41804144, No.42230311)
More Information
    Author Bio: ZHANG Wei, male, born in 1983, professor of engineer, on-the-job postdoctor, mainly engaged in metal mineral geophysical exploration and software development; E-mail: dr.zhangwei@qq.com .
    Corresponding author: ZHOU Jun, male, born in 1981, assistant researcher, mainly engaged in research on methods and applications of electromagnetic exploration of the Earth; E-mail: 20947936@qq.com
  • 研究目的

    随着黔西南戈塘地区豹子洞等浅表红土型金矿开采资源的逐渐枯竭,寻找深部接替资源的任务已经十分迫切。从区域成矿规律、物化探异常、典型矿床特征等成矿预测要素出发,戈塘地区海马谷控矿断层北西侧下盘深部二叠纪茅口组、龙潭组之间的碳酸盐岩与碎屑岩Si/Ca界面上具有较大地寻找“层控型”金矿床的找矿前景。

    研究方法

    引入了宽频大地电磁法查明了海马谷断裂西南段0~2 km深部的电性结构特征,从电阻率反演断面图中的低阻带异常特征推断海马谷断裂具有多期活动特征,早期(中二叠世前)表现为张性正断层性质,倾向北东;后期(早三叠世后)表现为压性逆断层性质,倾向南东,倾角70°~80°。从电阻率反演断面图中的高低阻等值线梯度带推断茅口组与龙潭组存在古岩溶地貌特征,在深部存在相对“隆起”和“凹陷”变化。

    研究结果

    综合本区典型矿床的成矿模式、找矿标志和区域物化探异常特征,认为处于“空白”状态的海马谷断裂北西盘深部值得部署探索性钻探工程,揭示其深部的资源潜力。

    结论

    浅深结合的勘查技术方法(组合元素化探异常+宽频大地电磁探测技术)能够为靶区优选提供证据支撑,邻近海马谷断裂的P2/P3、Si/Ca界面相对“隆起”位置是开展钻探验证工作的有利位置。

  • 加载中
  • 图 1  戈塘地区建造构造及金矿点分布特征

    Figure 1. 

    图 2  研究区前人地震勘探成果(据胡煜昭等,2011修改)

    Figure 2. 

    图 3  戈塘金矿区丫头寨—下兔浪地质剖面图(据毛彬吉等,2017修改)

    Figure 3. 

    图 4  戈塘地区成矿模式图(据贵州省地质矿产勘查开发局117地质大队,2018

    Figure 4. 

    图 5  戈塘地区1∶5万土壤地球化学异常特征图(据贵州省地质矿产勘查开发局117地质大队,2018

    Figure 5. 

    图 6  戈塘地区主要沉积地层电阻率物性柱状图

    Figure 6. 

    图 7  AMT与BMT法的野外数据观测对比试验结果

    Figure 7. 

    图 8  工作区地质背景与电法勘探线剖面位置图

    Figure 8. 

    图 9  宽频大地电磁电阻率二维反演联合剖面与整体电性结构特征图

    Figure 9. 

    图 10  02线勘探线剖面电阻率反演断面及其地质推断解释图

    Figure 10. 

    图 11  深部P2/P3不整合界面空间起伏特征综合推断图

    Figure 11. 

    表 1  物性标本电性参数测定结果统计表

    Table 1.  Statistical table of electrical parameters of physical samples

    下载: 导出CSV
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出版历程
收稿日期:  2020-02-07
修回日期:  2020-07-03
刊出日期:  2023-04-25

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