Home > Archive > No. 2 (202) 2026 > 31–45
Geology & Geochemistry of Combustible Minerals No. 2 (202) 2026, 31–45
ISSN 0869-0774 (Print), ISSN 2786-8621 (Online)
https://doi.org/
Oleh HNYLKO
Institute of Geology and Geochemistry of Combustible Minerals of the National Academy of Sciences of Ukraine, Lviv, Ukraine
e-mail: ohnilko@yahoo.com, https://orcid.org/0000-0001-5983-952X
Abstract
New data obtained as a result of geological mapping conducted in recent years, together with the analysis of literary sources, made it possible to distinguish the Late Cretaceous-Paleogene active margin of the Alkapa microcontinental terrane. Fore-Alkapa accretionary wedge composed of both the Pieniny Klippen Belt and Monastyrets Nappe were assigned to the Alkapa margin. Syn-orogenic formations (coarse-grained deposits of the trench-like basins in front of the wedge) and post-orogenic formations (deposits of the wedge-top basins) were distinguished. Geological evolution was considered in the context of the development of the entire Carpathian region.
The sedimentary successions of the Pieniny Klippen Belt and Monastyrets Unit were deposited in the basin located between the Alcapa and Tisza-Dacia terranes. Pieniny Klippen Belt composed of intensively deformed deposits had been formed as an accretionary wedge in front of the Alcapa active margin in the pre-Eocene time. Deformed deposits of the Pieniny Klippen Belt are unconformably covered by the post-orogene Eocene wedge-top sediments (Vulhivchyk Formation). Pieniny accretionary wedge was progradated onto the Monastyrets Basin. The stratigraphic succession of the Monastyrets Unit is characterized by coarsening upward from the Paleocene–Eocene thin-bedded flysch up to the Middle–Upper Eocene syn-orogenic massive sandy deposits. In addition, there are shallowing upward of these deposits. These patterns are characteristic of a growing accretionary wedge. Wedge progradation cased detaching of the deposits, synsedimentary uplifting and shallowing of the Monastyrets basin. Finally, the Monastyrets Nappe was added to the Fore-Alcapa accretionary wedge. Closuring of the Monastyrets “between-terrainian” flysch basin at the late Eocene and progradation of the Fore-Alcapa wedge onto the continental slope of the Tisza-Dacia Terrane at the Oligocene suggest the collision of the Alcapa and Tisza-Dacia Terrane.
Keywords
Ukrainian Carpathians, Alcapa and Tisza-Dacia terranes, Pieniny Klippen Belt, Monastyrets Nappe, accretionary wedge
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Received: February 09, 2026
Accepted: February 26, 2026
Published: May, 2026