ABSTRACT

More than hundred carbon isotopic data were examined statistically for the CO₂ discharges from the Carpathian Basin, central Europe. The δ¹³C values from the central Carpathian Basin show a normal distribution with the average value of –5 ± 2.5‰, whereas those from north-eastern part of Slovakia show a distribution slightly skewed towards heavier values. The average δ¹³C value indicates the mantle origin of the carbon, despite the lack of recent volcanic activity in the region. This is consistent with the existence of mantle He in the CO₂ discharges.