Abstract
The reservoir temperature and conceptual model of the Pasinler geothermal area, which is one of the most important geothermal areas in Eastern Anatolia, are determined by considering its hydrogeochemical and isotope properties. The geothermal waters have a temperature of 51 °C in the geothermal wells and are of Na–Cl–HCO3 type. The isotope contents of geothermal waters indicate that they are of meteoric origin and that they recharge on higher elevations than cold waters. The geothermal waters are of immature water class and their reservoir temperatures are calculated as 122–155 °C, and their cold water mixture rate is calculated as 32%. According to the δ13CVPDB values, the carbon in the geothermal waters originated from the dissolved carbon in the groundwaters and mantle-based CO2 gases. According to the δ34SCDT values, the sources of sulfur in the geothermal waters are volcanic sulfur, oil and coal, and limestones. The sources of the major ions (Na+, Ca2+, Mg2+, Cl−, and HCO3 −) in the geothermal waters are ion exchange and plagioclase and silicate weathering. It is determined that the volcanic rocks in the area have effects on the water chemistry and elements like Zn, Rb, Sr, and Ba originated from the rhyolite, rhyolitic tuff, and basalts. The rare earth element (REE) content of the geothermal waters is low, and according to the normalized REE diagrams, the light REE are getting depleted and heavy REE are getting enriched. The positive Eu and negative Ce anomalies of waters indicate oxygen-rich environments.
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Acknowledgements
We are grateful to Assistant Prof. Arzu Fırat Ersoy for assistances in the fieldwork. The authors also thank Assistant Prof. Adam Milewski from the University of Georgia (USA) for his help with the English of the final text.
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This research was supported by the Karadeniz Technical University Research Project Fund (Project Number: 1063).
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Temizel, E.H., Gültekin, F. Hydrochemical, isotopic, and reservoir characterization of the Pasinler (Erzurum) geothermal field, eastern Turkey. Arab J Geosci 11, 3 (2018). https://doi.org/10.1007/s12517-017-3349-6
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DOI: https://doi.org/10.1007/s12517-017-3349-6