C & O ISOTOPIC GEOCHEMISTRY OF SHOUWANGFEN COPPER DEPOSIT,HEBEI PROVINCE

C O isotope compositions of hydrothermal carbonates in skarn ores and porphyry ores of Shouwangfen copper deposit are systematically studied in this paper Combined with C O isotope compositions of the altered dolomitic wallrocks, the following points are demonstrated Carbon isotope compositions imply that carbon in the skarn ores were derived mainly from related magma or from mantle Although skarn ores are usually considered as product of interaction between carbonate wallrocks and magmatic fluids, the carbon of the sedimentary carbonate wallrocks seems not involved in the hydrothermal carbonates in the skarn ores The Shouwangfen ore district corresponds to a hydrothermal oreforming system that was promoted by highintruding magmatic rocks Systematic C O isotopic research can help to reveal the upper part (mainly related to heated and circulating meteoric water) and the lower part (principally related to ascending magmatic fluids) of this hydrothermal oreforming system Both skarn ore and porphyry ore, main targets of the mining activity, are formed by magmatic fluids