Journal of European Federation of Geologists , cilt.1, sa.1, ss.1-10, 2018 (Diğer Kurumların Hakemli Dergileri)
The study area is located in the western part of the continental rift zone of the Gediz within the Menderes Massif in western Anatolia and consists of Paleozoic schists, intercalation of carbonate schists, mica schists and phyllites and marbles, Mesozoic carbonate rocks and ophiolites, and Cenozoic sediments such as travertine and alluvium. The impermeable mica schists form the basement rocks in the area hydrogeologically. The Paleozoic marbles form a reservoir for geothermal waters and aquifer for groundwaters especially. The Pliocene to recent rocks play an important role as impermeable cap rocks for the formation of geothermal waters. The geothermal waters in Urganlı, with surface temperatures of 75 °C and reservoir temperatures of 180 °C, can be considered as Na-HCOtype geothermal waters rather than Ca-Mg-HCOtype groundwaters. In the area, the geothermal waters were modelled hydrogeologically. The Kula volcano located in the rift zone of Gediz within the Menderes Massif, with a last eruption age up to 18,000 years, might be considered as a heat source for the formation of geothermal waters in the study area.