| Title | Geological and Hydrogeological Study of Afyon-Gazligöl Geothermal Field, Turkey |
|---|---|
| Authors | Güler Göcmez and Ismail Kara |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | Geology, hydrogeology, geochemistry, geothermal field, Gazligöl, Afyon |
| Abstract | The Gazligöl geothermal field is located 20 km to the North of Afyon city. In the present study, geological and hydrogeological investigations of an area about 150 km2 were carried out. The Paleozoic metamorphic schists, which locally include quartzites are widely exposed. The metamorphic schists are overlain by Neogene sediments. Hot and mineralized water spring orifices are located on a NE-SW oriented normal fault line. Temperature and discharge of the springs are 32-40 0C and 0,1-1 l/s respectively. The temperature and water in the wells drilled in the area varies between 43-74 0C and the discharge rate ranges from 2.3 to 28 l/s. Depths of the wells are between 60 and 300 m. The warming up of hot and mineralized waters is due to high geothermal gradient related to neotectonics and volcanisms. The reservoir rocks are quartzites and schists of Paleozoic age. The cap rocks are the Neogene clay and tuff bearing rocks. Gazl?gˆl thermal water can be classified as sodium bicarbonate rich hot water. According to SiO2 geothermometers reservoir temperatures are estimated between 77-111 0C. Isotope analysis of hot and mineralized waters indicates a meteoric origin and groundwater circulation over 50 years. Three protection zones around the springs were proposed, potential pollution sources in each zone were assessed and some measures were recommended against pollution. |