Oxygen and carbon isotope study of calcite and dolomite in the disseminated gold-silver telluride Bulawan deposit, Negro's island, Philippines

摘要

Two types of carbonate minerals in ores and altered host rocks of the Bulawan deposit can be identified based on their δ~(18)O concentration. The δ~(18)O-depleted carbonates correspond with modified waters of magmatic origin with low salinity. The δ~(18)O-enriched carbonates probably formed from the reaction of mineralized fluids with limestone or other rocks with high δ~(18)O concentration.