the most distinguished active geothermal fields known in the World. The thermal waters from
the PGF are subdivided into two groups (Group 1A: Ca-HCO 3 and Group 1B: Ca-SO 4
types). The cold waters are also classified into two groups (Group 2A: Ca-HCO 3 and Group
2B: Mg-HCO 3 types). The hydrogeochemical properties of the PGF thermal waters suggest
interactions with the basal metamorphic rocks of the Menderes Massif, tectonically …