Abstract
In this study, the isotopic properties of the water resources located in Kopruoren Basin ( are determined. δ 18 O and δD contents of the samples respectively ranged from -10.84‰ to -7.09 ‰ and from -73.6‰ to -53.3‰ in dry season and ranged from -10.81‰ to -4.71‰ and -73.3‰ to -41.5‰ in wet season. Majority of the samples plotted along Global Meteoric Water line although some of them show deviations from this line. The reason for the deviations are attributed to evaporative enrichment, modifying the original δ 18 O and δD signatures of the samples. δ 18 O content of the thermal samples are not modified as a result of water-rock interaction due to low wellhead and reservoir temperatures. Tritium concentrations for all samples range from ~0 TU to 6 TU in wet season and from ~0 to 8 TU in dry season. Accordingly, some of the groundwater samples are recharged from modern precipitation, their groundwater residence times are short and they have shallow circulation. Besides, samples with tritium concentrations close to detection limits (thermal water samples and two of the groundwater samples) were recharge before tritium from nuclear weapon tests and have relatively higher residence times. These samples were also analysed for δ 13 C and 14 C to get information about the residence times. δ 13 C ve percent modern carbon contents of five samples range from -5‰ to -14.6‰ and from 8.2 to 78 pmc, respectively. The corrected 14 C ages for these samples are upto 11500 years before present, thereby indicating the presence of paleowaters in the basin. δ 13 C data indicate that 14 C contents of the thermal waters were diluted as a result of water-rock interaction.
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