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The measurement of soil gases and shallow temperature for determination of active faults in a geothermal area: a case study from Ömer–Gecek, Afyonkarahisar (West Anatolia)

  • ICCESEN 2017
  • Published:
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Abstract

Afyonkarahisar is a very important geothermal province of western Anatolia and has low and medium enthalpy geothermal areas. This study has been carried out for the preparation of distribution maps of soil gases (radon and carbon dioxide) and shallow soil temperature and the exploration of permeable tectonic regions associated with geothermal systems and reveal the origins of radon and carbon dioxide gases. The western district of the study area is characterized by the high radon concentration (168.30 kBq/m3), carbon dioxide ratio (0.30%), and soil temperature (21.0 °C) values. Fethibey and Demirçevre faults, which allow the circulation of geothermal fluids, have been detected in the distribution maps of radon, carbon dioxide, and shallow depth temperature and the directions of the curves in these maps correspond to the strikes of Demirçevre faults. The effect of the fault plays an important role in the change of carbon dioxide concentration along the W-E directional geological section prepared to determine the change of soil gas and shallow depth temperature values depending on lithological differences, fault existence, and geothermal reservoir depth. On the other hand, it was determined that Rn222 concentration and soil temperature changed as a function of geothermal reservoir depth or lithological difference. Tuffs in Köprülü volcano-sedimentary units are the main source of radon due to their higher uranium contents. Besides, the carbon dioxide in Ömer–Gecek soils has geothermal origin because of the highest carbon dioxide content (99.3%) in non-condense gas. The similarities in patterns of soil temperature, radon, and carbon dioxide indicate that the variation in soil temperatures is related to radon and carbon dioxide emissions. It is concluded that soil gas and temperature measurements can be used to determine the active faults in the initial stage of geothermal exploration successfully.

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Funding

This work was supported by Afyon Kocatepe University Science Research Projects Coordination Unit with the grant number 11.ARS.MER.04. The authors thank Afyon Kocatepe University Science Research Projects Coordination Unit for the financial support during the field and laboratory works.

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Authors and Affiliations

  1. Engineering Faculty, Department of Geological Engineering, Afyon Kocatepe University, Afyonkarahisar, Turkey

    Ahmet Yıldız, Can Başaran & Metin Bağcı

  2. Physics Department, Afyon Kocatepe University, Afyonkarahisar, Turkey

    Ayla Gümüş & Hüseyin Ali Yalım

  3. Center of Application and Research of Geothermal-Mineral Water and Ore Deposits, Afyon Kocatepe University, Afyonkarahisar, Turkey

    Feyzullah Ekrem Çonkar

  4. AFJET, Afyon Geothermal and Tourism Incorporated Company, Afyonkarahisar, Turkey

    Yusuf Ulutürk

Authors
  1. Ahmet Yıldız
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  2. Can Başaran
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  3. Metin Bağcı
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  4. Ayla Gümüş
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  5. Feyzullah Ekrem Çonkar
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  6. Yusuf Ulutürk
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  7. Hüseyin Ali Yalım
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Correspondence to Ahmet Yıldız.

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This article is part of the Topical Collection on Geo-Resources-Earth-Environmental Sciences

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Yıldız, A., Başaran, C., Bağcı, M. et al. The measurement of soil gases and shallow temperature for determination of active faults in a geothermal area: a case study from Ömer–Gecek, Afyonkarahisar (West Anatolia). Arab J Geosci 11, 175 (2018). https://doi.org/10.1007/s12517-018-3520-8

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  • DOI: https://doi.org/10.1007/s12517-018-3520-8

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