Hydrogeochemical Properties of Haymana (Ankara) Geothermal Field

Abstract

Haymana City is located in Central Anatolia and is the district of the capital City Ankara of Turkey.
Haymana shows a suitable structure for social and economic development and is famous with its balneological utilization applications.
This study contains the hydrogeological, hydrogeochemical and isotope hydrology studies in Haymana City. According to the hydrogeological studies, the permeable formations (reservoir rocks) are karstic Mollaresul, Caldag, Yesilyurt formations, alluvium and travertines.
Faults are developed mainly in E-W, NE-SW and NW-SE directions. The flow rate of the hot springs in Haymana geothermal field was totally 12 l/s with a temperature 34 - 44 ?C. Their flow was decreased and stopped with the production of the geothermal wells in 1986.
Haymana karstic hot waters are produced mainly from the MTA-4 (45 ?C, 52 l/s) and KH-1 (31,4 ?C) wells for balneological utilization in the thermal facilities (Seyran Hamami, Merkez Kaplica, Termal Otel, Uyuz Hamami). These waters are low mineralized (1137- 1171 mg/l), hyperthermal (45 ?C), Ca, Mg, HCO3, heated groundwaters. According to the isotopic analyses results, the cold and hot waters in Haymana area are of meteoric origin.
Due to the tritium analyses of the waters produced from the wells, the circulation duration is more than 50 years. The SiO2 geothermometers results are 43 - 57 ?C temperature interval, which appear to be more realistic if compared to the cation geothermometers which give rather very high results and also the production temperatures are 44 - 45 ?C.