Akademik Veri Yönetim Sistemi
GEOTHERMICS, cilt.79, ss.82-104, 2019 (SCI-Expanded)
The Camlidere prospect is located about 100 km NW of Ankara in northern Central Anatolia. Thermal springs discharge in volcanic terrain, often in clusters, along faults in 5 separate areas. The spring discharge temperatures are between 11 and 28 degrees C. Artesian flow of 4 wells (depths ranging from 100 to 1367 m) discharges Na-HCO3 and Ca-Na-HCO3 type thermal waters with temperatures changing between 27 and 42 degrees C. Cold springs at the fringe of the field are of Ca-HCO3 type. Constituents of minor elements (F, B, Fe, Ba, Rb, Cs, As and Sr) are incorporated in the thermal waters during deep water-rock interactions. Saturation indices indicate that mineralisation of the thermal waters involves dissolution of silicates, carbonates and ion exchange reactions. Mixing with surface waters and shallow groundwaters in the discharge areas modifies the geochemical character of the thermal waters. Isotopic data of Camlidere thermal waters (delta O-18, delta H-2, H-3) reflect their deep-circulating meteoric origin and indicate recharge areas between 1494 and 1833 m a.s.l. Such levels are supported by structural data and suggest that Camlidere thermal waters are recharged from the Aluc Mt. in the east and the Mahya Mt. to the west of Camlidere. Isotopic values also indicate a common recharge area (elevation) for deep groundwaters, but suggest different pathlengths required to account for variations in conductivity. Chemical geothermometry (K-Mg, quartz), alteration mineral assembleges and lack of delta O-18 enrichment indicate reservoir temperatures between 100 to-150 degrees C for the Camlidere area. The observed SiO2 values and inferred T(K-Mg) data indicate some advective (terrain controlled) shallow flows involving SiO2 re-equilibration of mixed thermal fluids.