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SONG Danhui, HAN Runsheng, WANG Mingzhi, ZHANG Yan, ZHOU Wei. 2020. Model of tectonite-lithofacies zoning in ore-controlling faults of the Qingshan lead-zinc deposit in northwestern Guizhou. Journal of Geomechanics, 26(3): 376-390. doi: 10.12090/j.issn.1006-6616.2020.26.03.033
Citation: SONG Danhui, HAN Runsheng, WANG Mingzhi, ZHANG Yan, ZHOU Wei. 2020. Model of tectonite-lithofacies zoning in ore-controlling faults of the Qingshan lead-zinc deposit in northwestern Guizhou. Journal of Geomechanics, 26(3): 376-390. doi: 10.12090/j.issn.1006-6616.2020.26.03.033
shu

Model of tectonite-lithofacies zoning in ore-controlling faults of the Qingshan lead-zinc deposit in northwestern Guizhou

  • 1.

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

  • 2.

    Southwest Institute of Geological Survey, Geological Survey Center for Non-ferrous Metal Resources, Kunming 650093, Yunnan, China

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Received Date:  25 April 2020
Revised Date:  11 May 2020
Publish Date:  30 June 2020
    Abstract

  • The Qingshan lead-zinc deposit is one of the typical deposits in the Weining-Shuicheng metallogenic subzone in the northwestern Guizhou ore concentration area, and orebodies are strictly controlled by both tectonic and lithologic factors. The tectonites in the ore-bearing fault zone with remarkable zoning characteristics are not only the hosts of deformation processes but also the responses for the environment of structure deformation. This paper focuses on the weak links in the study of the genetic connection between weakly altered tectonites and hydrothermal metallogenesis in the oblique strike-slip tectonic condition. Based on the tectonite-lithofacies zoning mapping method, we analyzed joints and fracture structures in different lithofacies belts, and systematically collected directional tectonite samples for microstructural and geochemical analysis. The tectonite type, material composition, internal texture and structure, and zoning characteristics were analyzed, and the zoning model of tectonite-lithofacies in this deposit was constructed. That is, outward from the orebody, the zoning sequence is as follows:the tensile initial cataclasite zone→the sludging zone (Level 1, 3 and above)→the torsional initial cataclasite zone→the compressive initial cataclasite zone. Pyritization, lead-zinc mineralization, calcitization and weak dolomitization occur in the torsional initial cataclasite zone, and calcitization occur in the compressive initial cataclasite zone. Mineralization-alteration changes from strong to weak as it moves away from the ore body, and the mineralization environment gradually decreases with the temperature, showing a tendency of oxidation→weak oxidation→weak reduction→reduction. Combined with the stress field analysis of macroscopic and microscopic structure, it is believed that different types of tectonites outside orebodies were caused by the changes in the partial stress field at different locations of the uniform tectonic stress field, and the secondary faults in the footwall of NW trending faults not only controlled the location and morphology of orebodies but also controlled the outward tectonite-lithofacies zone.

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