ORIGIN OF THE FLUIDS ASSOCIATED WITH GRANODIORITE-HOSTED, SB-AS-AU-W MINERALIZATION AT DUBRAVA (NIZKE-TATRY MTS, WESTERN CARPATHIANS)

Mineral parageneses of the polymetallic, Sb-rich deposit at Dubrava ha s been formed during five separated stages. A fluid inclusion study de monstrates that the earliest stages with scheelite, molybdenite and ar senopyrite have been associated with immiscible CO2 (+/- CH4)-rich, lo w-saline fluids at temperatures between 300 and 400 degrees C and pres sures as much as 2 kbar. Deposition of the main, superimposed ores, st ibnite and zinckenite, has been intimately connected with circulation of aqeuous, moderately saline fluids (15.5-23.5 wt % NaCl equiv.) upon epithermal conditions. Salinity of the aqueous fluids associated with tetrahedrite is clustered around 10 wt % NaCl equiv. Quartz from the latest, barite stage has precipitated from aqueous fluids enriched in divalent cations. These fluids are believed to be genetically linked w ith Triassic evaporite formations preserved in the region. Temperature -salinity diagrams constructed from microthermometry data indicate inf lux of diluted meteorite water in the stibnite, tetrahedrite and barit e stages. Isotopic data are in accordance with model. The delta(18)O v alues between -9.3 parts per thousand and +1.5 parts per thousand have been derived for water in equilibrium with quartz, coexisting with sp halerite, tetrahedrite and barite, thus confirming the participation o f isotopically lighter meteoric waters in the mineral-forming solution s. The delta(18)O values between +3.3 parts per thousand and +8.5 part s per thousand estimated for the water associated with the scheelite a nd arsenopyrite stages, are suggestive for the majority of metamorphic and/or magmatic water in the mineral-forming, CO2-rich solutions.