Temperatures of the tectonosphere of Ukraine

• Datum: 2025
• Hauptverfasser: Gordienko, Vadim, Gordienko, Ivan
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: S. Subbotin Institute of Geophysics of the NAS of Ukraine 2025
• Schlagworte: heat and mass transfer in the tectonosphere; three-dimensional thermal model
• Online Zugang: https://journals.uran.ua/geofizicheskiy/article/view/330049
• Назва журналу: Geofizicheskiy Zhurnal

In the paper, we propose a three-dimensional thermal model of the tectonosphere of Ukraine. Its basis is a scheme of endogenous regimes. Accordingly, we constructed heat and mass transfer models for each region for the ages of processes that can significantly affect the calculated temperature anomalies. We calculated the anomalies relative to the background temperature (represented by the thermal model of the platform at each depth) for the conditions of typical heat generation of crustal and mantle rocks. The calculated temperatures were compared with values independently established based on various petrological data. The average discrepancy is about 70 °C; it corresponds to the error of each method of about 50 °C and allows us to draw reliable isolines every 150 °C. For the crustal conditions, the isotherm step was 100 °C due to some additional information used. The results are schemes at depths of 10, 25, 35, 50, 75, 100, 150, 200, 300, and 400 km. The obtained thermal model reveals noticeable negative anomalies in the western platform regions with reduced heat generation of rocks (mainly the Ukrainian Shield). In some areas, the temperature was found to be higher than the rocks’ solidus at 25 km (the Carpathians, the Scythian Plate, and certain parts of the activated platform, Donbas, and the Lviv Trough), at depths of 50 and 100 km (the Carpathians and the Scythian Plate, slight inclusions on the platform), at 75 km (the melting is much more under the activated platform, in Donbas, and in the Lviv Trough) and at 400 km (under the inactivated platform). (Insufficient geological study of Ukraine’s territory, which may significantly increase the error in the results in some areas, has been noted. It applies primarily to the southern part of the Scythian Plate and the western part of the South Ukrainian monocline.)