LITHOLOGIC-STRUCTURAL FEATURES OF THE SECTION OF UPPER CRETACEOUS–PALEOGENE BOUNDARY IN THE PARASKA THRUST SHEET REAR PART (KOROSTIV-VILLAGE AREA)
Keywords:
Paraska thrust sheet, strike-slip fault, structure of imbrication, flysch deposits, Ukrainian Carpathians.Abstract
The new data on the lithological composition of layers from the Upper Cretaceous– Paleogene сontact zone in the flysch strata, which is exposed in the rear part of the Paraska thrust sheet (left side of the Oriava-river, north-eastern outskirts of the Korostivvillage, Skole district, Lviv region), are given. Because of large-scale mapping, the ratio of individual layers of the section was analyzed and the structural features of this contact zone were determined. In general, the section reflects the structure of imbrication caused by lit-par-lit sliding of the layers. The section is complicated by a low-amplitude steepinclined left-sided strike-slip fault. We associate the lithological composition and the facial variability of deposits with the conditions of sedimentation, as well as the longitudinal and transverse tectonic zoning of the trough basin.
References
Boichevska, L. T. & Tkachenko, E. M. (1971). About disjunctive dislocations of the structures of the Inner zone of the Precarpathian Foredeep (on the example of the Boryslav oilfield). Geology and Geochemistry of Combustible Minerals (23), 18–26 (in Ukrainian).
Dosin, H. (1970). Geological map of the USSR, scale 1:200 000. Carpathian series. Sheet M-34-ХХХ (Stryi). Lviv, Ivano-Frankivsk and Transcarpathian regions of the Ukrainian SSR. Explanatory note. Ministry of Geology of the USSR, Ministry of Geology of the Ukrainian SSR. Kyiv Geological Prospecting Trust (in Ukrainian).
Kopystianskiy, R. S. (1978). Jointing of Rocks and its Importance in Oil and Gas Geology. – Kiev : Naukova Dumka (in Russian).
Patalakha, Ye. I. & Smirnov, A. V. (1986). Introduction to Morphological Tectonics. Moscow: Nauka (in Russian).
Portniagina, L. A. (1981). Palynological criteria for the boundary of the Cretaceous and Paleogene in the Skibova zone of the Carpathians. Paleontological Collection (18), 67–72 (in Russian).
Vashchenko, V. O. & Hnylko, O. M. (2003). On stratigraphy and sedimentological features of the Neogene molassa of the Boryslavo-Pokutskyi and Sambirskyi covers of the Ukrainian Precarpathian. Geology and Geochemistry of Combustible Minerals (1), 87– 101 (in Ukrainian).
