EVENTUAL FORMATIONS OF MIOCENE DEPOSITS WITHIN THE WESTERN VICINITIES OF THE HOLOGIRSKI GORBOGIR MOUNTAINS
DOI:
https://doi.org/10.30970/vgl.40.07Keywords:
East European Platform, Badenian Regiostage, geology, stratigraphy, event formations, paleogeodynamicsAbstract
The purpose of the research was to clarify the sedimentological and structural features of the Baden section in the areas of the western spurs of the Hologora-Kremenetskyi Uplands of the Podolsk Upland of the East European Platform, and to analyze their paleogeographic and paleodynamic conditions of formation. The methodology of the work was based on a comparative analysis of the structural and textural features of these deposits with models of various lithodynamic types of littoral facies, defined and described on the basis of actualism in modern works on sedimentology. Based on the results of a detailed study of the Neogene section of platform formations in the Khom region, event-related lithodynamic (genetic) types – tempestites – were identified for the first time. A elaborate study of the architecture of the section and the structural-textural features and composition of the skeleton of detrital-clastic sandstones gave grounds to distinguish textural intervals of the stable sequence and to assign the deposits to this lithodynamic type of tempestites. Among the indicator signs of tempestite sequences (as an episodic type of formations), the following should be mentioned: the presence of a basal erosion surface, which is traced in the sole of the layers of the sequences, the development of submarine landslide structures, the spread of the interval of hilly oblique layering in the psamite sequences, the erosion of the upper elements of the sequence and the amalgamation (fusion) of sequences with a predominance of heterogeneous psamite in them. Tempestites are separated by background deposits of carbonate pelitic-fine psammite-siltstone rocks with traces of bioturbation. Distinct powerful intervals of gradational and hilly oblique layering are an indicator for attributing tempestites to the proximal type. The presence of submarine shear deformations of different orientations indicates the energetic influence of earthquakes during the formation of tempestites. They were probably initiated by active geodynamic restructuring of the Outer Carpathian Flysch Basin and transformation of the Tethys Ocean.
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