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5. Fluid inclusion microthermometric studies were done in the calcites of pre-main-stage mineralization (C2), in main-stage barite and in post-mineralization calcite (C3). Average homogenization temperatures of fluid inclusions are approximately equal: 165 ˚C in the pre- main stage calcite, 160 ˚C in post-mineralization calcite and 175 ˚C in barite, but their salinities change from lower than 1 to higher than 18wt% NaCl equivalent. Silica precipitation in the Ravanj deposit is very limited, in agreement with minor changes in temperature of fluid during mineralization. The wide range in salinity of the fluid inclusions plus contemporaneous deposition of barite and fine-grained galena are evidences for mixing of two geochemically different fluids. One of them was probably a low-salinity (5.6 wt% NaCl), CO2-beaing and sulfur-rich fluid. At a temperature of 160 ˚C, the neutral pH is about 5.8. Therefore the sulfides were deposited from fluids having a pH of 5-6. The effect of low-salinity, CO2-beaing fluid is to buffer the system. The second fluid, which was probably oxidized, saline (15.7 wt% NaCl) and metal-rich, shows salinity and homogenization temperatures characteristic of MVT ore forming fluids. ]]>
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