Sedimentary analysis of the Cretaceous flysch sequences Pieniny Klippen Belt, northern Slovakia)

摘要

The studied Cretaceous flysch succession of the Pieniny Klippen Belt in the Orava territory is similar to the Kysuca Unit where the lower, sandstone flysch (Sneznica Beds) and the upper, conglomerate flysch (Sromowce Formation) were distinguished (Andrusov and Samuel, 1985). Although the studied flysch successions at the Zemianska Dedina locality show sequences similar to the other localities in the Orava territory, there are some differences, mainly in the bed thickness, sandstones/claystones ratio, as well as in the presence of thick slump and slide matrix-supported conglomerate bodies. The sedimentological and stratigraphical evaluations of the section revealed mostly thin-to medium-rhythmic turbiditic development. The cyclicity of the thickening-upward sequences, relatively high lateral stability of the beds, their smaller thickness, presence of the Bouma's intervals and the assemblage of ichnofossils point to a deposition at the slope toe, within the central to outer part of deep-sea fans, rarely dissected by migrating feeding channels filled with upward-fining graded conglomerates and sandstones. The thick matrix-supported conglomerate bodies represent a result of slump and slides on steep submarine slopes transformed to debris--flows and mud-flows that transported sedimentary loads as far as the distal part of the turbiditic fans.