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Mantle volatiles and heat contributions in high sulfidation epithermal deposit from the Zijinshan Cu-Au-Mo-Ag orefield, Fujian Province, China: Evidence from He and Ar isotopes
Li-Yan Wu;  Rui-Zhong Hu;  Xiao-Feng Li;  Finlay M.Stuart;  Guo-Hao Jiang;  You-Qiang Qi;  Jing-Jing Zhu
2018
Source PublicationChemical Geology
Volume480Pages:58-65
Abstract

The source of metal and sulphur in porphyry and related epithermal deposits is a long debated issue. The role of mantle-derived magmas in providing the metals has proved particularly problematic. Here we report new He and Ar isotope determinations from ore fluids from the Zijinshan high sulfidation-epithermal Cu-Au deposit and Wuziqilong transitional Cu deposit from the giant Zijinshan porphyry-epithermal Cu-Au-Mo-Ag ore system (from 105 to 91 Ma), to decipher the contribution of mantle-derived volatiles and heat. Hydrothermal fluids in pyrite and digenite have He-3/He-4 up to 5.7 R-a, among the highest measured in ancient ore-forming fluids. A linear correlation between He and Ar isotopes indicate that the ore fluids were, to a first order, a mixture between a shallow crustal fluid, with low He-3/He-4, and a dominantly mantle-derived fluid with high He-3/He-4. The mantle He-3/He-4 is close to values typical of the upper mantle indicating the initial magmas that provided the heat for hydrothermal systems did not assimilate large volumes of continental crust. The ore-forming fluids have He-3/heat ratios that are 10 to 80 times higher than that of mid-oceanic ridge hydrothermal fluids, indicating that the metal-bearing fluids acquired heat and volatiles in a convective, rather than conducive, hydrothermal regime. It appears that mantle-derived volatiles, heat and probably metals have made a major contribution to the Cu-AuMo-Ag mineralization in the Zijinshan orefield.

KeywordHe And Ar Isotopes ore-forming Fluids mantle Magmas zijinshan Orefield china
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8698
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, Rankine Avenue, East Kilbride G75 0QF, UK
Recommended Citation
GB/T 7714
Li-Yan Wu;Rui-Zhong Hu;Xiao-Feng Li;Finlay M.Stuart;Guo-Hao Jiang;You-Qiang Qi;Jing-Jing Zhu. Mantle volatiles and heat contributions in high sulfidation epithermal deposit from the Zijinshan Cu-Au-Mo-Ag orefield, Fujian Province, China: Evidence from He and Ar isotopes[J]. Chemical Geology,2018,480:58-65.
APA Li-Yan Wu;Rui-Zhong Hu;Xiao-Feng Li;Finlay M.Stuart;Guo-Hao Jiang;You-Qiang Qi;Jing-Jing Zhu.(2018).Mantle volatiles and heat contributions in high sulfidation epithermal deposit from the Zijinshan Cu-Au-Mo-Ag orefield, Fujian Province, China: Evidence from He and Ar isotopes.Chemical Geology,480,58-65.
MLA Li-Yan Wu;Rui-Zhong Hu;Xiao-Feng Li;Finlay M.Stuart;Guo-Hao Jiang;You-Qiang Qi;Jing-Jing Zhu."Mantle volatiles and heat contributions in high sulfidation epithermal deposit from the Zijinshan Cu-Au-Mo-Ag orefield, Fujian Province, China: Evidence from He and Ar isotopes".Chemical Geology 480(2018):58-65.
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