Fluid inclusions in carbonate-dominated veinlets from selected Czech Upper Paleozoic basins display large variations in salinity (0-25 wt. % eq. NaCl/CaCl2) and smaller variations in the homogenization temperatures (41-112 °C). We suggest that the trapped fluids represent a mixture dominated by heated formation fluids., Jiří Zachariáš and Jiří Pešek., and Obsahuje bibliografii