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

Ruizhong Hu, G. Turner, P. G. Burnard, Hong Zhong, Zaojun Ye, Xianwu Bi

    Research output: Contribution to journalArticlepeer-review

    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 the 40Ar/36Ar and 3He/ 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 radiogenic 40Ar), crustal S and mantle-derived Pb remained in the ore-forming fluid.
    Original languageEnglish
    Pages (from-to)442-448
    Number of pages6
    JournalScience in China, Series D: Earth Sciences
    Volume41
    Issue number4
    Publication statusPublished - Aug 1998

    Keywords

    • Air saturated meteoric water
    • Fluid inclusion
    • He and Ar isotope
    • Jinding superlarge Pb-Zn deposit
    • Ore-forming fluid

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