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ZHAO Dong, HAN Runsheng, WANG Jiasheng, ZHANG Xiaopei, CUI Junhao, LI Ziteng. 2020. Structural analysis and ore-controlling model of the Xiaohe lead-zinc deposit in ore-concentrated area, northeastern Yunnan, China. Journal of Geomechanics, 26(3): 345-362. doi: 10.12090/j.issn.1006-6616.2020.26.03.031
Citation: ZHAO Dong, HAN Runsheng, WANG Jiasheng, ZHANG Xiaopei, CUI Junhao, LI Ziteng. 2020. Structural analysis and ore-controlling model of the Xiaohe lead-zinc deposit in ore-concentrated area, northeastern Yunnan, China. Journal of Geomechanics, 26(3): 345-362. doi: 10.12090/j.issn.1006-6616.2020.26.03.031
shu

Structural analysis and ore-controlling model of the Xiaohe lead-zinc deposit in ore-concentrated area, northeastern Yunnan, China

  • 1.

    Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 2.

    South-West Institute of Geological Survey, Geological Survey Center for Nonferrous Metals Resources, Kunming 650093, Yunnan, China

  • 3.

    Kunming Geological Prospecting Institute, China Metallurgical Geological Bureau, Kunming 650093, Yunnan, China

  • 4.

    Geological Survey of Anhui Province(Anhui Institute of Geological Sciences), Hefei 230001, Anhui, China

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Received Date:  30 April 2020
Revised Date:  13 May 2020
Publish Date:  30 June 2020
    Abstract

  • The Xiaohe lead-zinc deposit is one of the few typical lead-zinc deposits controlled by NW-trending major faults in the ore-concentrated area in northeastern Yunnan,China. The spatial distribution of mineralization and alteration is strictly controlled by structures. In order to ascertain the characteristics of the controlling effect of the structures on mineralization and alteration in this area,the large-scale tectonic-altered lithofacies mapping method in different level adits is adopted. The faults in different directions were screened and the characteristics of different mineralization and alteration in different level adits were systematically analyzed. The results show that:the composition,type and structure of mineralization and alteration of the Xiaohe lead-zinc deposit are relatively simple. Wall rock alteration is dominated by hydrothermal dolomitization,calcilization,silicification and pyritization. The mineralization mainly occurs to sphalerite and galena. Tectonic assemblages reflect the existence of a 6-phase tectonic system in the mining area:Caledonian-Haixi period,Early-Mid-Indosinian period,Late-Indosinian period to Early-Yanshan period,Middle Yanshan period,Late Yanshan period and Himalayan period. Large scale migration of ore-forming fluid occurred along the NW direction of tensile or torsional faults in the late Late-Indosinian and Early-Yanshan. Meneralization occurs in favorable structural parts such as the upper wall of the faults and its supporting secondary faults,structural fracture zones,joint fractures,etc. The mineralization-alteration zone was formed with the fault as the center and was distributed with zone. The sequence is mineralized marginal zone (Ⅰ),mineralized transition zone (Ⅱ) to mineralized central zone (Ⅲ). Finally,the structure-controlling model of the Xiaohe lead-zinc deposit was established. This understanding has important guiding significance for the prospecting prediction of similar deposits and the border area between Sichuan,Yunnan and Guizhou province.

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