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2023 Vol. 50, No. 2
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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
shu

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

  • 1.

    Chengdu Center of China Geological Survey, Chengdu 610082, Sichuan, China

  • 2.

    School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China

  • 3.

    No. 117 Geological Team, Guizhou Bureau of Geology and Mineral Exploration and Development, Guiyang 550018, Guizhou, China

  • 4.

    No. 102 Geological Team, Guizhou Bureau of Geology and Mineral Exploration and Development, Zunyi 563003, Guizhou, China

  • 5.

    No. 282 Team of Sichuan Nuclear Geology, Deyang 618099, Sichuan, China

    • 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 
Received Date:  07 February 2020
Revised Date:  03 July 2020
Publish Date:  25 April 2023
    Abstract

  • This paper is the result of mineral exploration engineering.

     Objective

    Accomplished by the gradual depletion of mineral resources of shallow laterite-type gold deposits, e.g., Baozidong in Getang area, it is essential to detect deep alternative resources. Based on the metallogenic prediction factors such as regional metallogeny, geophysical and geochemical anomalies, and typical deposit characteristics, the Si/Ca interface between carbonatite in Permian Maokou Formation (P2m) and clasolite of Longtan Formation (P3l) at the footwall of the Haimagu ore controlling fault show an ideal prospect for interface-type gold deposits.

     Methods

    The broadband magnetotelluric (BMT) method was introduced to imagine the electrical structure of 0-2 km depth in the southwest section of the Haimagu fault. The low resistivity zones revealing by the BMT inversion imply the Haimagu fault with multi-stage activity. In the early stage (before the Middle Permian), Haimagu fault is a tensile normal fault dipping to the northeast, and is a compressive reverse fault in the late stage (after the Early Triassic), dipping to the southeast with angel of 70°-80°. According to the gradient zone of high and low resistivity zone, it is inferred that the interface between Maokou Formation and Longtan Formation features paleo-karst landform with relative uplift and depression in the deep.

     Results

    As for the metallogenic model, e.g., prospecting criteria and regional geophysical and geochemical anomalies of the typical deposits in this area, it is considered that the northwest of Haimagu fault with little exploration is worth drilling the deep resource potential.

     Conclusions

    The combination technology of shallow and deep exploration (element geochemical anomaly and broadband magnetotelluric detection technology) can optimize to determine target areas. The relative uplifts of P2/P3 and Si/Ca interface adjacent to the Haimagu fault are favorable for drilling verification.
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