Informace o publikaci
Spodnomiocénní fluviální sedimenty v okolí Nových Bránic
| Autoři | |
|---|---|
| Rok publikování | 2025 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | GEOLOGICKÉ VÝZKUMY NA MORAVĚ A VE SLEZSKU |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://journals.muni.cz/gvms/article/view/41098 |
| Doi | https://doi.org/10.5817/GVMS2025-41098 |
| Klíčová slova | Carpathian Foredeep; lithofacies; provenance; fluvial deposits |
| Popis | Sedimentological study of the deposits at the locality near Nové Bránice provides data about Eggenburgian–Ottnangian deposits of the Carpathian Foredeep basin in the area. Altogether 9 lithofacies have been identified and deposits of the two facies associations/ depositional environment have been recognised in the outcrop. The first one is represented by deposits of the fluvial channel formed by traction currents of poorly confined waterflows. In-channel bedforms (2D and 3D gravelly and sandy dunes) represent their prominent part. Braided fluvial style is supposed with important role of variation in fluvial discharge. Paleocurrent data signalises transport towards SE, S or SSW. The deposits of the second facies associations (covering the deposits of the first facies association) are interpreted as proximal overbank deposits related to flood events with important role of aggradation. Provenance analysis of the fluvial deposits is based on the evaluation of petrography of pebbles, transparent heavy mineral assemblages, composition of garnet and rutile, and zircon studies). The assessment of the gamma-ray spectra provides supplementary data. An important role of relatively local sources has been recognised represented dominantly by local granitoids and metamorphics of the Brno Massif (primary source). The role of the next crystalline complexes (Moldanubicum, Moravian Zone) in provenance was minor. Moreover, a role of intense reworking and redeposition of material from older deposits (as recycled secondary source) is supposed. Studied fluvial system continued towards the centre of the peripheral foreland basin. |