Hydrogeochemical characteristics and trace element of geothermal systems in Central Anatolia, Turkey

Davraz A., Nalbantçılar M. T. , Önden İ.

Journal of African Earth Sciences, no.195, pp.1-15, 2022 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1016/j.jafrearsci.2022.104666
  • Journal Name: Journal of African Earth Sciences
  • Journal Indexes: Science Citation Index Expanded
  • Page Numbers: pp.1-15


Located on the Alpine–Himalayan orogenic belt, Turkey has an outstanding geothermal potential due to

geothermal systems developed by young tectonic and volcanic activity. In particular, Central Anatolia is Turkey’s

geopolitical region with the second-greatest potential in terms of geothermal resources. In a contribution to

hydrogeochemical studies performed in a limited part of Central Anatolia, we designed a study to determine the

hydrogeological and hydrogeochemical properties of the geothermal fields located in provinces within the region’s

Konya Plain Project (KOP)-Aksaray, Karaman, Kırıkkale, Kırs¸ehir, Konya, Ni˘gde, Nevs¸ehir and Yozgatwhich

collectively occupy 12.2% of Turkey’s total area and contain 39 geothermal fields. In the study area,

geothermal fluids are used for tourism, greenhouse cultivation, city heating and industrial purposes, and the

outlet temperatures of thermal waters were recorded to range from 21.0 to 105.5 ◦C. In the study area, there are

four different water types as (i) CaMgHCO3, CaHCO3, (ii) CaNaHCO3Cl, (iii) NaCaClSO4 and (iv) NaCl and

reservoir rocks were generally Palaeozoic metamorphic (i.e. marble) and/or igneous (i.e. granodiorite, granite

and rhyolites). Chemical geothermometers (i.e. cation and silica) were used to determine the reservoir temperature

of the geothermal waters.