FEATURES OF THE DEPOSITS OF THE LOWER DEVONIAN RED-COLOUR-TERRIGENIOS FORMATION OF THE LVIV PALEOZOIC DEPRESSION

Abstract

Sediments of the Lower Devonian continental red-terrigenous formation of the Dniester series of the Lviv Paleozoic troughwere formed in the alluvial facies environment mainly in the oxidizing medium (they have a red color), and some of them are inthe restorative (gray color of the sediments). In the process of formation and existence, sedimentary formations of the LowerDevonian continental red-terrigenous formation underwent a number of successive stages of lithogenesis: sedimentary, diaand catagenesis and were significantly influenced by glazing processes at the stage of diagenesis. The authors investigatedthe catagenetic transformations of sandstones, siltstones, argillites, rocks of mixed composition of different facies (channel,riparian and floodplain facies conditions) taking into account geochemical (both oxidative and reductive) conditions of formation.A high degree of catagenetic transformations (up to the stage of late catagenesis) of rocks has been established. It was foundthat the nature and intensity of catagenetic transformations not only of different petrotypes, but also of the same type of rocksof different facial affiliation differ significantly, even if they are at the same stratigraphic level. It is established that the degreeof catagenetic transformations of sediments depends on their structural and textural features, material composition and facialaffiliation