The isotopic composition of carbon in mineral waters of the Polish Flysch Carpathians

The paper contains the results of carbon isotopes determinations in CO2, HCO3- and CH4 of mineral waters occuring in the Polish Flysch Carpathians. Values of 13C in CO2 and HCO3- occuring in waters from the Magura nappe are in general higher than the corresponding values in methane-free waters from the Silesian nappe. Thus one can assume that within the former unit CO2 is of deep origin, being probably a product of degasification of the upper mantle or produced during the metamorphism of rocks rich in carbonates. More negative values recorded within the Silesian nappe seem to show that CO2, at least in part, is a product of hydrocarbons oxidation, the deposits of which occur in this unit. (author)