GEOPHYSICAL AND GEOCHEMICAL FEATURES OF ORE-FORMING FLUID IN FANKOU SUPER-LARGE LEAD-ZINC DEPOSIT

The ore forming fluid, a medium that absorbs, transports and precipitates mineral materials, is an important topic for the research into the contemporary basin and mineralization. The testing analysis is made of the temperature, salinity and chemical composition of the mineral fluid inclusions in the deposit, on the basis of the field geological research into mineral deposits, the indoor microscopic research and geochemical research. The testing analytical results show that Fankou ore bearing fluid, the intermediate low temperature hydrothermal liquid low in salinity and weak in acidity, belongs to K⁺-Ca²⁺-Cl^- types of deep circulating ore bearing fluid rich in CO₂. This ore bearing fluid, a specific deep circulating fluid, differs not only from the basin compaction fluid but also from the ore forming fluid in the porphyrite type deposit.