Isotopic evaluation of geothermal waters in Konya Region (Turkey)

Konya region (Turkey) has three important geothermal subregion. These are Cihanbeyli, Beysehir-Seydisehir-Ilgin and Ismil-Eregli subregions. Geothermal waters in the region have temperature between 19.8-51 deg. C, discharge between 0.1-130 L/s and total mineralization range from 852 to 5110 mg/L. The isotopic analysis evaluated according to 18O/2H, 18O/TU, Cl/TU, pH/EC and Giggenbach diagrams. The geothermal water aquifers are recharged from higher altitudes and they are hardly affected by recent precipitations and these waters reveal meteoric origin. They have more negative δ18O and δ2H values and lower 3H contents compared to cold waters. The reservoir rock temperature is 250 deg. C, and water depths are ranging from 500 to 1000 m. The waters are heated from volcanism and geothermal gradient. (author)