Abstract
In this study environmental radioisotopes of water (3H and 14C) were used to determine the residence time of thermal waters. The temperature of geothermal waters was found to be uniform (57.6 °C ± 0.75 °C) with similar field alkalinity and pH values. The δ13C values of thermal water ranged between − 21.3 and − 18.75‰, which clearly reflect no/minimum contribution of carbonate minerals to the system. Environmental tritium concentration was found to be very low in these thermal waters indicating insignificant recharge from modern sources. The Pearson modelled 14C ages were found to vary from 4964 to 17,714 years.
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