【摘要】 斑岩型铜矿是世界上铜资源最主要来源。目前广泛的认为典型斑岩型铜矿是由高氧逸度、高盐度的成矿流体形成的,称为氧化性斑岩型铜矿,成矿流体属于NaCl-H₂O-CO₂体系。但随着人们不断深入研究发现,斑岩型铜矿的成矿流体也可以是具有还原性质的,如含CH₄、H₂和CO,属于H₂O-NaCl-CH₄-CO₂体系。该文分别分析了两种矿床成矿流体的性质,说明了氧化性成矿流体的来源、演化以及早期阶段磁铁矿的沉淀引起还原S的形成机制。对于还原性成矿流体,重点探讨了成矿流体中CH₄的来源,以及CH₄的存在对矿化机制的影响。更多还原

【Abstract】 Porphyry type of Cu deposits is major source of Cu resources in the world at present. Generally,a typical porphyry Cu deposit is considered as original from ore fluids with high oxygen fugacity and high salinity, therefore, under the name of oxidized porphyry Cu deposit. But, recent study indicates the ore fluids may be reduced, containing CH₄, H₂ and CO and belonging to H₂O-NaCl-CH₄-CO₂ system. This reduced fluid,origin and influence of CH₄ are discussed.更多还原