Active geothermal systems in the rift zone of the B

Abstract

Hydrogeological, hydrogeochemical, and isotope geochemical data of the thermal waters of Kızıldere, Salavatlı, and Germencik in the rift zone of Büyük Menderes were studied. The metamorphic and sedimentary rocks in the fields are altered intensively. The hydrothermal alteration is distinguished by phyllic, argillic, silicic ± haematitization, and carbonatization zones. The surface temperatures of the waters range from 30 to 99 °C whereas the geochemical thermometers indicate a reservoir temperature between 162 and 242 °C. The Na-(SO4)-(Cl)-HCO3 type thermal waters show meteoric origin due to isotopic ratios of δ2H versus δ18O.