Hydrogeological, Hydrogeochemical and Isotope Geochemical Features of the Geothermal Waters in Seferihisar and Environs, Western Anatolia, Turkey

World Multidisciplinary Earth Sciences Symposium 2017

Ozgür, Nevzat^1 ; Pala, Ebru Aras^2 ; Degirmenci, Saliha^2

Suleyman Demirel University, Faculty of Engineering, Department of Geological Engineering, Isparta, Turkey^1

Suleyman Demirel University, Graduate School of Applied and Natural Sciences, Isparta, Turkey^2

关键词: Geochemical features;    Geothermal water;    Hydrogeochemical;    Hydrogeological;    Reservoir temperatures;    Thermal waters;    Ultrabasic rocks;    Western Anatolia;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/2/022039/pdf
DOI  :  10.1088/1755-1315/95/2/022039

来源: IOP

【 摘 要 】

The study area of Seferihisar is located within the Izmir-Ankara suture in the NW of the Menderes Massif in western Anatolia, Turkey. The Paleozoic metamorphic rocks of the Menderes Massif form the basement rocks in the area which are overlain by 760 m thick Izmir-flysch series consisting of metamorphic rocks, limestones and ultrabasic rocks tectonically. The Pliocene Bahcecik formation which consists of an alternation of conglomerates, sandstones, claystones, lignite and limestones and shows a thickness of 300 m overlies the (zmir) flysch series discordantly. This is overlain by 430 m thick Yeniköy formation composed of conglomerates, sandstones, claystones and clayey limestones discordantly. The Miocene volcanic rocks of Cumaovasi overlie the Yeniköy formation concordantly which are overlain by alluvium and travertine deposits. Geothermal waters which are observed in the localities of Tuzla, Cumali, Doanbey and Karakoc are associated with NE-SW trending faults in the area. The geothermal waters in the area are considered as Na-Cl or Na-Cl-HCO3type waters. The geothermal waters of Seferihisar and environs are identified to be Na+K>Ca>Mg dominant cations and Cl>HCO3>SO4dominant anions. According to the diagram of Na/100-K/100-√Mg, a certainly part of the thermal waters can be considered as equilibrated thermal waters during some waters are of immature waters. According to the results of geochemical thermometers, the reservoir temperatures of thermal waters range from 150 to 240°C. The δ2H values of thermal waters are between -13,3 to -31,9, while δ18O values range from -2,55 to -5,70. The tritium contents of thermal waters are between 13 to 6410 TU.