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Hydrochemistry and environmental isotope study of the geothermal water around Beypazarı granitoids, Ankara, Turkey

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Environmental Geology

Abstract

Hydrochemical analysis results suggest four different water types: bicarbonate dominant water (facies-I), sulfate dominant cold brine water (facies-II), sodium-bicarbonate dominant thermal water and thermal and mineralized water (facies-III), and sulfate–chloride dominant thermal and mineralized water (facies-IV). The mineral content/salinity of the water is related to the ions that these waters dissolve from the minerals on the rocks during infiltration and circulation in the saturated zone. Gypsum cover units that exist on the granitoids in the region is the main factor for the ion increase in the facies III geothermal water similar to the cold brine water (facies II). Isotopic analyses indicate that the thermal springs (Dutlu bath spring, Ayaş bath well, Çoban bath well and Kapullu bath spring) are of meteoric origin and receive recharge from precipitation in the Beypazarı granitoids and around gypseous formations with elevations of about 950–1,150 m. Karakaya bath well and Ilıca bath spring thermal water points are recharged from the Bilecik limestone hills, Tekke volcanics and İncedoruk Formations. Karakoca mineral spring of thermal and mineralized water is recharged from out of the study area. According to oxygen-18 (SO4 2−) and sulfur-34 (SO4 2−) contents, sulfate in water samples from Ayaş and Dutlu resorts as well as Çoban bath is derived from the gypsum of Kirmir Formation as the primary source. Sulfates of the Kapullu bath water and Karakoca mineral water originate from secondary sources such as pyrite oxidation and bacteriological reduction.

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Acknowledgments

This study was financially supported by TUBITAK under grant nos. 104Y056 and 108Y108, and Scientific Research Projects Unit of the Ankara University under grant no. 2005-07-45-027.

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Authors and Affiliations

  1. Energy Raw Materials Research and Exploration Department, General Directorate of Mineral Research and Exploration, 06520, Ankara, Turkey

    Oktay Çelmen

  2. Department of Geological Engineering, Ankara University, Tandoğan, 06100, Ankara, Turkey

    Mehmet Çelik

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  1. Oktay Çelmen
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  2. Mehmet Çelik
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Correspondence to Mehmet Çelik.

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Çelmen, O., Çelik, M. Hydrochemistry and environmental isotope study of the geothermal water around Beypazarı granitoids, Ankara, Turkey. Environ Geol 58, 1689–1701 (2009). https://doi.org/10.1007/s00254-008-1669-2

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  • DOI: https://doi.org/10.1007/s00254-008-1669-2

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