20.500.12556/RUL-186714 Morfološka analiza rodoidov z območja Srebrnika na Kozjanskem Morphological analysis of the rhodoliths from Srebrnik in Kozjansko V diplomski nalogi je bila izvedena morfološka in sedimentološka analiza rodoidov iz badenijskih plasti Laške formacije na območju Srebrnika na Kozjanskem. Namen raziskave je bil opredeliti morfološke značilnosti rodoidov, primerjati rodoide iz dveh stratigrafskih horizontov ter na podlagi njihove zunanje in notranje zgradbe interpretirati pogoje sedimentacijskega okolja. Analiziranih je bilo 153 rodoidov, od tega 144 iz spodnjega in devet iz zgornjega horizonta. Opravljene so bile meritve treh glavnih osi, makroskopska analiza zunanje površine in prerezov rodoidov ter sedimentološka analiza kamnin v katerih se rodoidi pojavljajo. Rodoidi obeh horizontov so bili po velikosti primerljivi, vendar so se razlikovali predvsem po obliki. V spodnjem horizontu so prevladovali bolj sploščeni in diskasti rodoidi, pogosto orientirani vzporedno s plastnatostjo, medtem ko so bili rodoidi zgornjega horizonta bolj ekvidimenzionalni oziroma sferični in brez izrazite preferenčne orientacije. Razlike v razmerjih med osmi so bile statistično značilne. Notranja zgradba je razkrila koncentrične do valovite algne skorje, raznolika jedra, prekinitve rasti in bioerozijske strukture, kar je pokazalo na večfazno rast rodoidov. Sedimentološka analiza je pokazala prisotnost organogenega boundstona in bioklastičnega packstona, ki kažeta na plitvomorsko karbonatno okolje z bogato biogeno produkcijo in razmeroma aktivnimi hidrodinamskimi razmerami. Na podlagi morfoloških, tafonomskih in sedimentoloških značilnosti je bilo ugotovljeno, da so rodoidi nastajali v dinamičnem plitvomorskem okolju. Razlike med horizontoma so bile interpretirane predvsem kot posledica sprememb hidrodinamskih razmer, stabilnosti substrata in pogostosti premikanja rodoidov na morskem dnu. The diploma presented a morphological and sedimentological analysis of rhodoliths from Badenian deposits of the Laško Formation in the Srebrnik area, Kozjansko, Slovenia. The aim of the study was to characterize the morphology of the rhodoliths, compare specimens from two stratigraphic horizons, and interpret the depositional conditions based on their external morphology and internal structure. A total of 153 rhodoliths were analysed, including 144 specimens from the lower horizon and nine from the upper horizon. Three main axes were measured, and macroscopic analyses of the external surfaces and cross-sections of the rhodoliths were performed together with sedimentological analyses of rocks and thin sections. Rhodoliths from both horizons were comparable in size but differed mainly in shape. The lower horizon was dominated by more flattened and discoidal rhodoliths, which were commonly oriented parallel to bedding, whereas the upper horizon contained more equidimensional to spheroidal specimens without a pronounced preferred orientation. Differences in axis ratios between the two horizons were statistically significant. The internal structure revealed concentric to undulating algal crusts, diverse nuclei, growth interruptions, and bioerosional structures, indicating multiphase rhodolith growth. Sedimentological analysis identified organogenic boundstone and bioclastic packstone. Based on the combined morphological, taphonomic, and sedimentological characteristics, the rhodoliths were interpreted as having developed in a dynamic shallow-marine environment. Differences between the two horizons were primarily attributed to variations in hydrodynamic conditions, substrate stability, and the frequency of rhodolith movement on the seafloor. rodoidi koralinejske rdeče alge Laška formacija morfološka analiza sedimentacijsko okolje Srebrnik rhodoliths coralline red algae Laško Formation morphological analysis depositional environment Srebrnik true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-04 09:01:32 2026-09-04 09:01:37 2026-09-05 04:34:11 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 115583 30571.pdf 30571.pdf 1 D2DD7A893A5E777EF4C4CA041B39A35B f1a6a2175516e7c607ab3eec7501e7af8b19d224e9af6a6ed0dfb7b7edf27fe4 77cdbfe9-a82e-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246053 Naravoslovnotehniška fakulteta 0 0 0