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YUAN Hang, HAN Runsheng, FENG Zhixing, WU Peng, GUAN Shenjin, DING Tianzhu, LI Lingjie, YANG Bo. 2022. Mineralization-alteration zoning law and element compositional zoning pattern in mineralized altered rocks from the Daliangzi Pb-Zn deposit, southwestern Sichuan. Journal of Geomechanics, 28(3): 432-447. doi: 10.12090/j.issn.1006-6616.2021016
Citation: YUAN Hang, HAN Runsheng, FENG Zhixing, WU Peng, GUAN Shenjin, DING Tianzhu, LI Lingjie, YANG Bo. 2022. Mineralization-alteration zoning law and element compositional zoning pattern in mineralized altered rocks from the Daliangzi Pb-Zn deposit, southwestern Sichuan. Journal of Geomechanics, 28(3): 432-447. doi: 10.12090/j.issn.1006-6616.2021016
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Mineralization-alteration zoning law and element compositional zoning pattern in mineralized altered rocks from the Daliangzi Pb-Zn deposit, southwestern Sichuan

  • 1.

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

  • 2.

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

  • 3.

    West Mining Co., Ltd, Xining 810001, Qinghai, China

  • 4.

    Sichuan Huidong Daliang Mining Co., Ltd, Liangshan Yi Autonomous Prefecture 615205, Sichuan, China

    • Fund Project: This research is financially supported by the National Natural Science Foundation of China (Grant No.42172086), the "Yunling scholars" Talent Plan (2014), the program of Yunnan Mineral Resources Prediction and Evaluation Engineering Laboratory (2010); and the program of Yunnan Geological Process and Mineral Resources Innovation Team (2012)
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Received Date:  11 March 2021
Revised Date:  02 May 2022
Publish Date:  28 June 2022
    Abstract

  • The Daliangzi deposit in southwestern Sichuan is a representative epigenetic hydrothermal Pb-Zn deposit hosted by carbonate rocks of Sinian Dengying Formation in the Sichuan-Yunnan-Guizhou area. The mineralization-alteration zoning law of this deposit is still unclear. A mineralization-alteration petrographic mapping is carried out at a scale of 1:200 in the middle sections of 1884 m, 1944 m, 2004 m and 2064 m in the mining area. The alteration type, intensity and altered rock fabric are carefully studied, and the mineralization-alteration intensity variation, mineral paragenesis, element compositional zoning characteristics are summarized. The results reveal the variation law of characteristic element contents in different mineralization-alteration zones, following the mineralization-alteration zoning pattern from the center of Pb-Zn ore body to host rock: medium silicification+dolomitization brecciated Pb-Zn ore facies belt (I)→medium silicification+dolomitization and stockwork Pb-Zn mineralization facies belt (Ⅱ)→strong silicification+dolomitization+calcitization+veined to star shaped pyritization facies belt (Ⅲ)→calcitization+carbonaceous+pyritization facies belt (IV). The variation characteristics of metallogenic elements, characteristic element compositions and element ratios show that the mineralization indicator elements follow the horizontal zoning law of Pb-Zn-Cd→Pb-Zn-Ag-Cu(Sb)→Ag-Cu-As-Sb→As-Sb in different alteration zones, and the variation trend of mineralization indicating elements is summarized. This study provides a reference to the deep prospecting and exploration in this deposit and studies on mineralization-alteration zoning of the same type of deposit.

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