Hydrogeochemical study of the gümüşköy spa (Aydin) and its vicinity

Gümüşköy spa is located in southwest of the büyük menderes graben in western anatolia. the thermal waters of the area have spring temperatures of 20-36 °c, ph of 6.4-7.5 and ec of 4960 to 5079 μs/cm. water type of thermal waters is generally na-cl type. reservoir rocks of geothermal systems are marble and fissured schist units of menderes massif. impermeable units of neogene are the cap rocks of geothermal systems. heat source of system is also geothermal gradient connected with tectonism. according to giggenbach diagram (1988), thermal waters mostly fall into the immature fields and reservoir temperatures vary between 55-114 °c. mineral saturation in outlet temperatures indicates that calcite, aragonite, and dolomite minerals are generally oversaturated in the thermal waters. however, it is seen that the thermal waters is undersaturated with gypsum, anhydrite, celestite, and barite. it is determined that calcite, aragonite and dolomite minerals will be created scaling risk in production and conduction line of the thermal waters and during the reinjection of waste water. silica minerals may also precipitate amorphous silica due to kinetic properties.