Implications resulting from the study of the fluid inclusions in the shear zone-type gold mineralization from Bozovici (Banat) and Somesul Rece (Gilau Mountains)

The paper presents the results of a study on fluid inclusions (petrography, chemistry, Th, Td) from the gold-containing quartz in the shear zone – type mineralizations from Bozovici (Banat) and Some¿ul Rece (Gil¾u Mountains). Four types of fluid inclusions were identified: A – aqueous, AS – aqueous with efflorescences and crystals of nahcolite, C – monophasic and biphasic containing CO2, and AC – aqueous solutions with CO2. Microthermometry (Th and Td) indicated homogenisation temperatures of nahcolite between 136-2600 C, total homogenisation temperatures of 283-3900 C, and a maximum temperature (Td) between 380-4200 C. The molar content of the CO2/H2O ratio varies between 0.35 – 0.72; salinity ranges between 2 – 14 wt % equivalent. Gold is intimately disseminated in quartz (in both studied occurrences), but also it is associated with sulphides, especially pyrite (Bozovici) and chalcopyrite (Some¿ul Rece)