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In the Upper Silesia ZnPb ore district, southern Poland, a particular type of Triassic travertines occurs. The work focuses on the microthermometric analysis of one- and two-phase inclusions. Primary liquid-vapour fluid inclusion in calcite yielded homogenization temperatures of 57–97 °C and 1 atm pressure. The travertine-forming fluids were NaCaCl type aqueous solutions. The inferred salinity of fluids is: 15.17–22.33 eq. wt.% NaCl, 14.97–21.44 eq. wt.% CaCl₂, i.e. they contain concentrated brines. Comparing these fluid inclusion data with those of gangue calcites and calcite cements from the Upper Silesia ore district, it is suggested that the travertines, which are of hydrothermal origin display a geochemical link to the primary sulfide ores.