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Helium and argon isotopic geochemistry of Jinding superlarge Pb-Zn deposit

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Abstract

The study results of He and Ar isotopes from fluid inclusions in pyrites formed during mineralization stage of Jinding superlarge Pb-Zn deposit in west Yunnan, China are reported. The data show that the40Ar/36Ar and3He/4He ratios of fluid inclusions are respectively in the range of 301. 7–385. 7 and 0. 03–0.06Ra, suggesting the oreforming fluid is a kind of air saturated meteoric groundwater. On the basis of research on coupled relationships among He, Ar, S and Pb isotopes, the evolution history of ore-forming fluid of the deposit can be summarized as (i) air saturated meteogenic groundwater infiltrated down and was heated→ (ii) leached S, C and radiogenic He, Ar from the basinal strata → (iii) leached Pb and Zn from mantle-derived igneous rocks located in the bottom of the basin→ (iv) ore-forming fluid ascended and formed the deposit. Due to this process, the isotope signatures of crustal radiogenic He, atmospheric Ar (with partial radiogenic40Ar), crustal S and mantle-derived Pb remained in the ore-forming fluid.

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Authors and Affiliations

  1. Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang, China

    Ruizhong Hu, Hong Zhong, Zaojun Ye & Xianwu Bi

  2. Department of Earth Sciences, University of Manchester, M13 9PL, Manchester, UK

    G. Turner & P. G. Burnard

Authors
  1. Ruizhong Hu
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  2. G. Turner
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  3. P. G. Burnard
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  4. Hong Zhong
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  5. Zaojun Ye
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  6. Xianwu Bi
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Project supported by A30 Project of the National Climbing Program of China and University of Manchester.

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Hu, R., Turner, G., Burnard, P.G. et al. Helium and argon isotopic geochemistry of Jinding superlarge Pb-Zn deposit. Sci. China Ser. D-Earth Sci. 41, 442–448 (1998). https://doi.org/10.1007/BF02932698

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  • DOI: https://doi.org/10.1007/BF02932698

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