20.500.12556/RUL-178401 Reconstruction of palaeoflow and depositional dynamics from the Merjasec unroofed cave, Laze Plain (central Slovenia) Rekonstrukcija paleotoka in dinamike zapolnjevanja brezstrope jame Merjasec, Laški ravnik (osrednja Slovenija) Sparsely preserved unroofed cave deposits are ancient remains of cave systems. The Merjasec unroofed cave is a perfect example of poorly preserved cave deposits where conventional sedimentological study revealed a greater potential for the reconstruction of local to regional palaeoenvironmental conditions. Cave deposits are characterised by polymictic conglomerates, pebbly sandstones and flowstone belonging to five distinct sedimentary facies. Sedimentary features indicate deposition of channel-related bedforms in a narrow cave-connecting conduit, activated only during extreme pulsating floods under epiphreatic conditions. In this sense, it mimics the current hydrology of the regional system and shows that the hydrological history of the cave system is strongly dependent on climatic conditions. Moreover, this study demonstrates a methodological approach that can be successfully applied to similary exposed cave deposits elsewhere, showing that even fragmentary or eroded remnants, when analysed in detail, can significantly contribute to understanding of karst palaeohydrology. Redkeje ohranjeni sediment brezstropih jam so ostanki starejših jamskih sistemov. Brezstropa jama Merjasec je odličen primer slabo ohranjenih jamskih sedimentov, kjer so konvencionalne sedimentološke študije pokazale velik potencial za rekonstrukcijo lokalnih do regionalnih paleookoljskih razmer. Jamske sedimente predstavljajo polimiktični konglomerati, prodnati peščenjaki ter sige in so organizirani v pet različnih sedimentnih faciesov. Sedimentne značilnosti kažejo na odlaganje v ozkem, povezujočem kanalu aktiviranem le med ekstremnimi pulzirajočimi poplavami pod epifreatičnimi pogoji. V tem smislu posnema sedanjo hidrologijo regionalnega sistema in kaže, da je hidrološka zgodovina jamskega sistema močno odvisna od podnebnih razmer. Poleg tega ta študija prikazuje metodološki pristop, ki ga je mogoče uspešno uporabiti za podobno razgaljene jamske sedimente drugje, in kaže, da lahko celo fragmentirani ali erodirani ostanki, če jih podrobno analiziramo, pomembno prispevajo k razumevanju kraške paleohidrologije. karst denuded cave clastic cave deposits facies fluvial depositional dynamics palaeoenvironment kras brezstropa jama klastični jamski sedimenti faciesi fluvialno dinamika odlaganja paleookolje true false true Angleški jezik Slovenski jezik Članek v reviji 2026-01-27 04:18:47 2026-01-30 09:30:39 2026-02-01 04:37:50 0000-00-00 00:00:00 2025 0 0 str. 30-45 ǂšt. ǂ2 ǂLetn. ǂ65 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 551.435.84:551.3.051(497.4) 1581-6613 10.3986/AGS.14446 252196867 AGS-65-2_HiRes-obrezano_30-46.pdf AGS-65-2_HiRes-obrezano_30-46.pdf 1 373CB570773E8DF8A7100C565BECD7E2 d2c285900560937991bae32b0eac99bcf5f883bb88483f887718caf6bee5c15d dd90a6db-fdb3-11f0-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226805 http://dx.doi.org/10.3986/AGS.14446 0 cd7e51f6-fdb5-11f0-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=226810 Naravoslovnotehniška fakulteta 0 0 0