Akademik Veri Yönetim Sistemi
TURKIYE JEOLOJI BULTENI-GEOLOGICAL BULLETIN OF TURKEY, cilt.52, sa.3, ss.297-323, 2009 (ESCI, TRDizin)
The study area is located on the southern rim of the Gediz Graben and to the west of Salihli town. In the study reported here, the hydrochemical characteristics of these geothermal fields were determined by chemical and isotopic data. The Menderes Massif rocks, which are formed by highly fractured karstic marbles, granodiorite, gneiss and guartz-schist units, are aquifers of the geothermal systems in the study area. The Neogene terrestrial sediments, which are made up of alluvial deposits, act as cap rocks for the geothermal systems. Alluvium is the most important unit for cold ground water production. The thermal springs in the Sart-Camur Spa have an outlet temperature of 52 degrees C and a 5 l/s discharge. Thermal fluid with a temperature of 155 degrees C and a 2 l/s discharge was recorded at the drilling well, a well 1189 m deep, in the Caferbey geothermal field. The circulation of thermal fluid in the subsurface is along the fault and fracture zones. Results of environmental isotope and chemical analyses show that the thermal waters in the study area are of meteoric origin and generally have water-rock interactions. According to AIH chemical classifications, these thermal waters reflect the water types Na-Ca-HCO3 and Na-HCO3 in the Sart-Camur and Caferbey geothermal fields, respectively. Cold waters are mainly dominated by HCO3- and SO4- ions, with Na+2, Ca+2 and Mg+2 cations. High boron and arsenic contents are among the contaminants when it comes to irrigation and drinking water sources in area. Because of these, reinjection of the thermal waters into the geothermal aquifer after use them is important, not only to recharge the reservoir but also to prevent harmful effects on the environment. According to various geothermometers, reservoir temperatures are calculated as varying between 8 degrees C and 290 degrees C. The thermal waters in the study area are oversaturated with respect to carbonate minerals (calcite and aragonite). These are most likely to cause scaling problems during extraction and use.