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Geological characteristics and ore-hosting mechanism of the carbonate-hosted type lead-zinc deposits in Guizhou Province, China(Vol. 40, No.4, 2020) TEXT SIZE: A A A

JIN Zhong-guo1, HUANG Zhi-long2*, ZHENG Ming-hong1, LIU Ling1, ZHANG Lun-wei1, ZENG Dao-guo1, TANG Yong-yong2, ZHOU Jia-xi3

(1. Guizhou Nonferrous Metal and Nuclear Industry Geological Exploration Bureau, Guiyang 550005,China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy Sciences, Guiyang 550081,China;
3. School of Earth Sciences,Yunnan University, Kunming 650500,China)

Abstract: The lead-zinc deposits in Guizhou Province are mainly distributed in swarms in the eastern and western Guizhou. The carbonate rock-hosted lead-zinc deposits account for 82% of the prospected lead-zinc resources and over 90% of the total proved lead-zinc reserves in Guizhou Province. Many carbonate-hosted lead-zinc deposits are distributed in various strata including the Neoproterozoic Sinian Dengying Formation, and the upper Paleozoic Permian Qixia and Maokou formations. The chronological studies show that the lead-zinc mineralization ages are obviously later than those of host strata. The deposits have obvious characteristics of epigenetic metallogeny, and they belong to the MVT-type deposit. In this paper, based on the analysis of regional geology, geochemical background and geological characteristics of typical Pb-Zn deposits, we have discussed the internal relationship between formation and characteristics of carbonate rocks and the lead and zinc mineralization, and have revealed that the migration, enrichment, and mineralization of lead-zinc enriched ore-forming fluids in carbonate rocks are controlled by various factors including the regional tectonic activity and structural development degree, fluid source and compositional characteristics, physicochemical conditions of the fluids, the water-rock reaction, and the mixing of deep hot brine fluid and S-rich fluid in the host layers.The comprehensive summary of the regional Pb-Zn metallogenic regulation will provide significant guidance for the Pb-Zn ore prospecting prediction.

Keywords: lead-zinc deposit; carbonate rock; ore-hosting mechanism; Guizhou Province

ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 346-355

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