EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Origin and Evolution of Silicified Rocks in the Etili - Çanakkale, Turkey

Hatice Ünal Ercan1, Ömer Işık Ece2, Paul A. Schroeder3, and Fatma Gülmez4
Hatice Ünal Ercan et al.
  • 1KonyaTechnical University, Department of Chemical and Chemical Processing Technologies, Turkey (
  • 2Istanbul Technical University, Faculty of Mines Department of Geological Sciences, Maslak 34469 Istanbul TURKEY
  • 3University of Georgia, Department. of Geology, Athens GA 30602-2501 USA
  • 4Medithermal Energy Co. Yukarı Mah. Üsküdar Cad. No: 18/11, 34860 İstanbul, Turkey;

There are many well-known geothermal systems linked to magmatic activity on Earth, many of which eventually express a surface manifestation of the below ground magmatism. The Oligo-Miocene was a period of very active magmatism that took place in Western Anatolia, where granitoidic plutons were emplaced within crust while calcalkaline to alkaline lavas and associated pyroclastics produced by volcanoes under the control of extensional tectonism. Progressive deformation of the crust due to the extension resulted since that time resulting in the development of a E/NE-W/SW trending fault system and of fracture zones that run perpendicular to main faults.

The mineralogical composition of the Hamamtepe and Muratdağı silica sinter deposits is comprised of kaolinite, alunite, and quartz. Microlithofacies of these deposits were defined as, i) massive, ii) laminated, iii) breccia, and iv) porous. δ18O stable isotope analysis on silicified rocks and δ34S with 40Ar/39Ar radiometric age analysis on alunite minerals were performed with the aim of constraining the origin and timing of the silica deposits. We obtained results from δ18O ranging from 12.3 to 18.4 ‰, δ34S ranging from 9.2 and 16.6 ‰, and radiometric age analysis, which all suggest that the silica sinter deposits formed in a steam heated, low pH, oxidizing epithermal environments., coeval with prominent volcanic activity in the region.

How to cite: Ünal Ercan, H., Ece, Ö. I., Schroeder, P. A., and Gülmez, F.: Origin and Evolution of Silicified Rocks in the Etili - Çanakkale, Turkey, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1496,, 2021.


Display file