Fluid inclusion study of quartz veins from the orogenic Klecza gold deposit in the Kaczawa Mountains (SW Poland)

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Abstract

Primary fluid inclusions in different generations of auriferous quartz from the Klecza orogenic gold deposit crystallized from 340 to 244°C with decreasing salinity of fluids of 12.3 to 6.4 wt% NaCl equivalent and at pressure drop of 0.9 to 0.7 kb. Fluids revealed the presence of moderate to low saline two-phase aqueous fluids with CO2, N2 and CH4. in ore fluids beside sodium cations there occurred especially high concentration of K and low to moderate contents of Al and Fe cations that caused Au precipitation. Post-ore fluids are characterized by domination of Na. The correlation between gold and sulphur as well as common occurrence of gold inclusions in pyrite and arsenopyrite of the first ore stage mineralization suggest that gold was transported as reduced bisulphide complexes. The values of the sulphur isotope compositions of the considered above sulphides reflect a strong sulphur contribution from the graphitic schists beside the magmatic source of sulphur.