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2023 Vol. 43, No. 4
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ZHANG Wei, LIAO Guozhong, LIAO Zhenwen, YANG Jian, WANG Qiao, LI Hua, ZHANG Chen, JIANG Shipeng. 2023. Study on the prospecting model of concealed MVT lead-zinc deposits in northeastern Yunnan Province: A case study of Maozu lead-zinc deposit. Sedimentary Geology and Tethyan Geology, 43(4): 779-796. doi: 10.19826/j.cnki.1009-3850.2022.10002
Citation: ZHANG Wei, LIAO Guozhong, LIAO Zhenwen, YANG Jian, WANG Qiao, LI Hua, ZHANG Chen, JIANG Shipeng. 2023. Study on the prospecting model of concealed MVT lead-zinc deposits in northeastern Yunnan Province: A case study of Maozu lead-zinc deposit. Sedimentary Geology and Tethyan Geology, 43(4): 779-796. doi: 10.19826/j.cnki.1009-3850.2022.10002
shu

Study on the prospecting model of concealed MVT lead-zinc deposits in northeastern Yunnan Province: A case study of Maozu lead-zinc deposit

  • 1.

    Chengdu Center, China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu 610218, China

  • 2.

    Civil-military Integration Center of Geological Survey, China Geological Survey, Chengdu 610036, China

  • 3.

    Qiaojia Maozu Lead and Zinc Company Limited, Zhaotong 654604, China

  • 4.

    School of Geophysics, Chengdu University Of Technology, Chengdu 610059, China

More Information
Received Date:  14 December 2021
Revised Date:  02 June 2022
Accepted Date:  07 June 2022
Publish Date:  31 December 2023
    Abstract

  • Northeast Yunnan Province is one of the most important production areas of MVT lead-zinc deposits in China. In recent years, with the gradual depletion of resources in shallow mining areas, it is urgent to find new replacement resources in the peripheral and deep parts of mining areas. Taking the typical MVT Maozu lead-zinc deposit in Qiaojia county as an example, this paper puts forward a prospecting model suitable for deep exploration of MVT lead-zinc deposits in this area. This prospecting model is based on comprehensive exploration methods tests of known deposits around the mining area and detailed study of the geological background, metallogenic model, deposit characteristics, and prospecting indicators of MVT deposits in this area. The experimental data show that the high-value Pb-Zn-Ag anomalies concentrated along the fault fracture zone in the geochemical survey indicate that there are signatures of ore-forming hydrothermal activity in the deep parts of the faults. The audio frequency magnetotelluric method can be used to identify the burial depth of concealed orebodies, the fluctuations in favorable ore-forming interfaces between the Ediacaran Dengying Formation and the Cambrian Qiongzhusi Formation in the deep underground, and the tendency and scale of the ore-forming faults. The intermediate gradient IP (Induced Polarization Method) measurement of an area can delineate the favorable prospecting area (high polarization anomaly area) on the “horizontal plane scale”, and large-scale IP sounding profiles can further delineate the favorable ore body target areas that are of low resistivity and high polarization anomaly on the “vertical space scale”. The research results show that the combined use of the shallow and deep exploration technologies described in this paper, including the combined element anomalies of shallow geochemical exploration, the deep geological structure of the resistivity profile, and the IP anomaly bodies of the plane and profile, can provide interdisciplinary evidence support for optimizing the deep prospecting target area in this area, and the turning points of anticline and syncline folds close to ore-guiding (controlling) faults and the stratigraphic interface of the Dengying Formation and the Qiongzhusi Formation are preferred drilling verification locations.

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