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Most large to huge porphyry Cu deposits (PCDs) are oxidized, making the Baogutu reduced porphyry Cu deposit (RPCD) a relative rarity. CH4-bearing ore-forming fluids formed at several hydrothermal stages, however, their source is still unclear. To address this issue, isotopic investigations of sulfide He–Ar–S and calcite C were conducted. Fluid inclusions hosted in sulfides (arsenopyrite, chalcopyrite...
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