Home > Archive > No. 3–4 (199–200) 2025 > 13–24
Geology & Geochemistry of Combustible Minerals No. 3–4 (199–200) 2025, 13–24
https://doi.org/
Ihor MYKHAILOVSKYI
LLC “BURPROEKT”, Lviv, Ukraine, e-mail: igormykhailovskyi@ukr.net
Abstract
The aim of the research is to clarify the influence of the Badenian-Sarmatian sedimentary accumulation on the autochthonous part of the Precarpathian trough and the nature of consolidation and postsedimentation dislocations in the middle of the upper molasses. The research methods are based on a detailed correlation of well sections within individual megablocks of the Outer zone of the trough and a comparison of the obtained results, establishing the connections of the sedimentary accumulation with the paleogeomorphological features of the pre-Neogene erosional surface. The Miocene epoch of the development of the Outer zone of the Precarpathian trough was accompanied by regional transgression with the accumulation of a thick layer of Badenian-Sarmatian, mainly terrigenous sediments. The erosion system created in the early Miocene in areas not involved in the processes of the late Alpine orogenesis, preserved its main structural features under the layer of the upper molasses. The lithofacies features of the latter were directly dependent on a number of factors, the main of which are the lithological composition of the supply sources, the distance from the zone of active erosion processes, the mechanisms and routes of sedimentary material transportation, the mobility of the sedimentation basin and post-sedimentary transformations at different stages of sediment consolidation. The granulometric composition, the degree of sorting and the heterogeneity of the clastic material were largely controlled by the paleorelief of the bottom of the sedimentation basin and its dynamics. The main factor in the formation of discontinuous and plicative dislocations within the upper molasse complex were the forces of gravity, which were especially activated in areas with significant slope steepness. This led to the formation of regional and local slip-landslides, which were accompanied by antithetical (compensatory) disturbances.
Keywords
deflection, depression, abutment, tectonic disturbances, denudation, erosion surface
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