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Tectonic-sedimentary evolution of the southwestern part of the Ukrainian flysch Carpathians

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Category: Geology

Last Updated on 11 October 2015

Published on 11 October 2015

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Authors:

O.M. Hnylko, Cand. Sci. (Geol.), Senior Research Scientist, Institute of Geology and Geochemistry of Combustible Minerals under National Academy of Sciences of Ukraine, Senior Research Scientist, Lviv, Ukraine

S.R. Hnylko, Institute of Geology and Geochemistry of Combustible Minerals under National Academy of Sciences of Ukraine, Engineer, Lviv, Ukraine

L.V. Heneralova, Cand. Sci. (Geol.), Associate Professor, Ivan Franko Lviv National University, Senior Lecturer, Lviv, Ukraine

Abstract:

Purpose. Reconstruction of tectonic and sedimentary development south-western part of the Ukrainian Flysch Carpathians.

Methodology. Natural Cretaceous-Paleogene sections of flysch were investigated using the facial method, in particular the sedimentological and micropaleontological analysis.

Findings. There in deposits of the Monastyrets, Magura and Dukla nappes of the Ukrainian Carpathians were identified (for most lithostratigraphic units for the first time), the characteristic texture and structural features indicating these deposits as lithified products of turbidite-, grain- and debris-flows and bottom currents and background hemipelagic settling. It was established that the distribution of associations of small foraminifera in stratigraphic succession of the Dukla Nappe indicates a change of paleobathymetric conditions from lower bathyal-abyssal, with a predominance of agglutinating benthos (Cretaceous, Paleocene and Eocene) to bathyal above foraminiferal lysocline with a predominance of plankton (Upper Eocene), and to the upper sublittoral-bathyal with plankton and varied calcareous benthos (Oligocene). The Monastyrets, Magura and Dukla tectonic units are characterized by a number of features (in particular, "younging" of deposits from internal to external (sub)nappes, confinement of coarse and shallower facies to the upper part of stratigraphic successions) suggest to consider these units as an ancient accretionary prism, which was synsedimentary increased by new thrust sheets during Eocene-Oligocene time.

Originality. Sedimentary processes and environment of deposits of the Monastyrets, Magura and Dukla nappes were reconstructed. Model of involving these deposits into the accretionary prism was proposed.

Practical value. A more detailed and advanced application of sedimentological and microfaunistic analysis, as well as the compilation of historical evolutionary models, will allow forecasting space-age distribution of lithofacies, particularly sandy and clay layers, which is necessary for searches of minerals.

References:

1. “Foraminifera and sedimentary paleoenvironment of the Lower Cretaceous Black Shale formation (Ukrainian Carpathians)”, Mineralia Slovaca, Vol. 29, No. 4–5, p. 333

2. Гнилко О.М. Тектонічне районування Карпат у світлі терейнової тектоніки. Стаття 2. Флішеві Карпати – давня акреційна призма / О.М. Гнилко // Геодинаміка. – 2012. – № 1. – С. 67–78.

Hnylko, O.M. (2010), “Tectonic subdivision of the Carpathians in terms of the terrane tectonics. Article 2. The Flysch Carpathian – ancient accretionary prism”, Geodynamika, no. 1, pp. 67–78.

3. Csontos, L. and Vörös, A. (2004), “Mesozoic plate tectonic reconstruction of the Carpathian region”, Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 210, pp. 1–56.

4. Csontos, L., Argenio, B. and Doglioni, C. (2006), The Carpathian-Pannonian Region: A Reviev of Mesozoic-Cenozoic Stratigraphy and Tectonics, Vol. 1. Stratigraphy. Vol. 2. Geophysics, Tectonics, Facies, Paleogeography, Hantken Press, Budapest, Hungary.

5. Стратотипы меловых и палеогеновых отложений Украинских Карпат / [Вялов О.С., Гавура С.П., Даныш В.В. и др.]. – К.: Изд-во „Наук. думка“. – 1998. – 204 с.

Vialov, O.S., Gavura, S.P. and Danysh, V.V. (1998), Stratotipy melovykh i paleogenovykh otlozheniy Ukrainskikh Karpat [The Stratotype of Cretaceous and Paleogene Deposits of the Ukrainian Carpathians], Naukova Dumka, Kiev, Ukraine.

6. Oszczypko, N., Oszczypko-Glowec, M., Golonka, J. and Krobicki M. (2005), “Position of the Marmarosh Flysch (Eastern Carpathians) and relation to the Magura Nappe (Western Carpathians)”, Acta Geologica Hungarica, Vol. 48, no. 3, pp. 259–282.

7. Oszczypko, N., Uchman, A. and Malata, E. (2006), Rozwój paleotektoniczny basenów Karpat zewnętrznych i Pienińskiego pasa skałkowego [Development of Basin Paleotectonics of the Outer Carpathians and the Pieniny Klippen Belt], Instytut Nauk Geologicznych Uniwersytetu Jagiellońskiego, Kraków, Poland.

8. Bindiu, R. and Filipescu, S. (2011), “Agglutinated Foraminifera from the Northern Tarcau Nappe (Eastern Carpathians, Romania)”, Studia UBB Geologia, Vol. 56, no. 2, pp. 31–41.

9. Bubik, M. (1995), “Cretaceous to Paleogene agglutinated foraminifera of the Bilé Karpaty unit (West Carpathians, Czech Republik)”, Grzybowski Foundation Special Publication, Proceedings of the Fourth international Workshop on Agglutinated Foraminifera, Kraków, Poland, no. 3, pp. 71–116.

10. Nagymarosy, A. and Baldi-Beke, M. (1993), “The Szolnol unit and its probable paleogeographic position”, Tectonophysics, Vol. 226, pp. 457–470.

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