Title:

Hydrogeological Modelling of Geothermal Waters in Dikili (Izmir) and Environs, Western Anatolia, Turkey

Authors:

Nevzat ÖZGÜR

Key Words:

Turkey, western Anatolia, Dikili, geothermal waters, hydrogeological modelling

Conference:

Stanford Geothermal Workshop

Year:

2020

Session:

Geochemistry

Language:

English

Paper Number:

Azgar

File Size:

654 KB

View File:

Abstract:

Study area is located 100 km N of province capital of Izmir in western Anatolia, Turkey. In the area, a great number of geothermal waters with surface temperatures of 100 °C and groundwaters occur. The Camoba and Kinik formations in Permian age form the basement which are overlain by Paleocene Kozak granodiorites, Yuntdagi volcanics 1 in Paleocene to Miocene age, Miocene Yuntdagi volcanics 2, Pleistocene Yuntdagi volcanics 3 and Pleistocene Dededag basalts discordantly. These are overlain by Quaternary alluvium discordantly. In addition to in-situ measurements such as temperature, pH, Eh, EC, dissolved oxygen and alkalinity values in the area, we have collected 5 samples of geothermal waters which were analyzed for cations by ICP-OES and anions by IC. In order to clarify the origin of geothermal waters and mixing rate of geothermal waters and groundwaters, the stable isotopes of 18O and 2H and tritium contents were analyzed. Hydrogeochemically, geothermal waters display Na+K more than Ca more than Mg dominant cations and HCO3 more than SO4 more than Cl dominant anions. Geothermal waters are of Na-(SO4)-HCO3 type and show immature waters as well as partially equilibrated waters with reservoir temperatures up to 150 °C. The geothermal waters in Dikili and environs were represented as hydrogeological modelling due to hydrogeological, hydrogeochemical and isotope geochemical data.


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