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Thallium geochemistry of the Tianqiao Pb-Zn deposit in the northwestern Guizhou, China (Vol. 40, No.4, 2020) TEXT SIZE: A A A

WU Chang-xiong1, HE Yu-fan2, 3, ZHANG Jia-wei4, LIU Xing-ping1, CHEN Song1, HUANG Zhi-long2*

(1. The Sixth Geological Team, Bureau of Geology of Hubei Province, Xiaogan 432000, China;
2. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. Touris Management School, Guizhou University of Commerce, Guiyang 550014, China;
4. Guizhou Geological Survey, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiyang 550081, China)

Abstract: The Tianqiao Pb-Zn deposit is a representative of the medium sized deposit located in the Northwestern Guizhou Pb-Zn metallogrenic zone of the Sichuan-Yunnan-Guizhou Pb-Zn polymetallic mineralization concentration area. Its orebodies are hosted in Carboniferous carbonate rock and are strictly controlled by structures. In this study, thallium (Tl) concentrations of major sulfides (pyrite, sphalerite, and galena) from the Tianqiao Pb-Zn were analyzed by using ICP-MS techniques. The results show that the concentrations and enrichment coefficients of Tl in galenas from primary ore bodies of the deposit were significantly higher than those in pyrites and sphalerites, as contents and enrichment coefficients of Tl in galenas, pyrites, and sphalerites are 4.09-7.85 μg/g and 8.18-15.7,0.293-0.463 μg/g and 0.59-0.93, and 0.144-0.565 μg/g and 0.29-1.13, respectively. Accordingly, Based on the relevant percentage of galena in ores, the content of Tl in ores is estimated to be 0.5 μg/g, which is close to the minimum criterion of comprehensive utilization of Tl in ores of the Pb-Zn deposit. Combined with the evolution of ore-forming fluids of the deposit and geochemical properties of Tl, Pb, and Zn, it is believed that Tl was relatively enriched in the ore-forming fluid of the late evolution stage of the deposit as Tl replaced Pb in an isomorphic form in the lattice of galena.

Keywords: Thallium (Tl) geochemistry; galena; Tianqiao Pb-Zn deposit; Northwestern Guizhou, China

ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 412-417

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