21. Petrography and geothermobarometry of quartz diorite from Pohorje Mountains, SloveniaTim Sotelšek, Simona Jarc, Andreja Pajnkiher, Mirijam Vrabec, 2025, original scientific article Abstract: The mineral composition and pressure–temperature conditions of Pohorje quartz diorite were investigated to reconstruct crystallization sequence and integrate the results with previous data on the Pohorje igneous complex, providing insights into its petrogenesis. Pohorje quartz diorite has phaneritic texture and is medium- to coarse-grained. The major minerals include light green clinopyroxene, dark green amphiboles, and white feldspars; the first two give the rock its characteristic colour. The proportion of dark- to light-colored minerals is approximately 4:1. Clinopyroxene predominates and correspond to diopside (XCa = 0.47–0.51, XMg = 0.41–0.49, XFe = 0.05–0.09). Amphiboles are Ca-amphiboles and are divided into two types: Type I amphiboles occur as single grains with distinctive core and rim zones, whereas Type II amphiboles replace clinopyroxene grains. Type I amphibole cores are classified as magnesiohornblende, tschermakite, edenite, pargasite, or magnesiohastingsite; Type I amphibole rims are classified as magnesiohornblende and actinolite; and Type II amphiboles are classified as magnesiohornblende. The dominant feldspars are oligoclase to andesine (XAb= 0.61–0.73), often replaced by potassium feldspar orthoclase. Minor minerals include quartz, biotite group minerals, apatite group minerals, titanite, epidote group minerals (allanite), and magnetite, while secondary minerals comprise chlorite group minerals and calcite. Various thermometers and barometers were applied to reconstruct the crystallization history of the quartz diorite and link it to the evolution of the host granodiorite intrusion. Thermobarometric data indicate that clinopyroxene in the quartz diorite, which is considered the earliest cumulate product from basaltic melts, crystallized under the highest P–T conditions (840–905 °C; 6.70–7.70 kbar), consistent with petrographic evidence. Subsequent crystallization of Type I amphibole cores occurred at 675–730 °C and 6.45–6.50 kbar, conditions comparable to those of the less evolved granodiorite, suggesting coeval formation. Later stages involved the formation of Type I amphibole rims at 585–640 °C and ~2.00 kbar, Type II amphiboles at 615–680 °C and 2.59–2.79 kbar, and biotites at 670–690 °C, associated with the emplacement of more evolved granodiorite at shallower crustal levels.
Keywords: quartz diorite, “cizlakite”, petrography, clinopyroxene geothermobarometry, amphibole geothermobarometry, amphibole–plagioclase thermometry, Pohorje Mountains
Published in DiRROS: 24.12.2025; Views: 46; Downloads: 13
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22. Prostorski razvoj sivega dela Grödenske formacije na Žirovskem vrhuFranc Čadež, Ivan Gantar, 2025, original scientific article Abstract: Raziskave in odkopavanje se je na Rudniku urana Žirovski vrh opravljalo med leti 1960 in 1990. Ivan Mlakar (2000) je razdelil celotno Grödensko formacijo na 6 členov in poimenoval najstarejši Brebovniški člen v katerem je poznano orudenje z uranom. Že pred tem je Tomaž Budkovič (1980) ta sivi del Grödenske formacije razčlenil na 10 horizontov na osnovi barve, zrnavosti in prodniških združb in sicer po podatkih kartiranja podkopa P-10 in njegovega nadaljevanja. V tem članku smo prikazali razvoj Brebovniškega člena na celotnem prostoru rudišča, tako jame kot tudi njenega nadaljevanja proti JV in SZ. Prvotno razdelitev Budkoviča smo spremenili tako, da smo zgornji del 3. horizonta z intraformacijskimi konglomerati in nekdanji 4. peščeni horizont združili v enoten 5. konglomeratni horizont. Dragomir Skaberne je namreč v svojem doktoratu (1995) Brebovniški člen razdelil na 2 megaritma pri čemer se vsak pričenja s konglomerati, zaključi pa z drobnozrnatimi sedimentnimi kamninami. Zato je ustrezneje, da se 3. horizont zaključi z drobnozrnatimi sedimenti in je hkrati zaključek 1. megaritma, intraformacijski konglomerati, ki so bili prej še zgornji del 3. horizonta pa so po novem že del enotnega konglomeratnega horizonta, ki podrejeno vsebujejo še peščenjake.
Debelina celotnega Brebovniškega člena je največja v osrednjem delu odprte jame, kjer znaša 410 m in se proti robovom bazena zmanjšuje. Na območju Golega vrha proti JV, do kamor sežejo pojavi orudenja, se njegova debelina zmanjša na 50 m. Debelina posameznih horizontov pa se, razen 2. in 5. horizonta, zmanjša z nekaj 10 metrov le na nekaj metrov oziroma se posamezni horizonti celo izklinjajo. V SZ smeri od nekdanjih jamskih del ni več ekonomsko pomembnih orudenj z uranom. V to smer se izklinjajo pisani konglomerati, spreminja se tudi značaj peščenih horizontov, ki so bili v jami glavni nosilci orudenja. Njihova barva se spreminja iz sive in temnosive v zelenosivo, v njih je manj drobcev antracitizirane organske snovi, ki je pogojevala nastanek redukcijskih sredin, kjer se je lahko izločal uran. V pisanih konglomeratih je pomembna prisotnost prodnikov kislih magmatskih predornin, ki imajo povišan clark urana glede na druge skupine kamnin. Z njihovo erozijo so se površinske vode ter podtalnica obogatile z uranom že na površju, dodatno pa še pri precejanju skozi plasti pisanega konglomerata. V oksidacijskih pogojih se je uran raztapljal, v redukcijskih pa izločal v vezivu peščenih klastitov. Od celotne dolžine pojavljanja plasti sivega Brebovniškega člena, ki meri po geološki karti 18 km, znaša območje s pogojno ekonomskim orudenjem le dobrih 5,5 km in približno na ta del je omejeno tudi pojavljanje pisanih konglomeratov.
Keywords: sedimentacijski razvoj, orudenje, grödenske klastične kamnine, Žirovski vrh
Published in DiRROS: 24.12.2025; Views: 37; Downloads: 12
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23. Transmission electron microscopy analysis of shock veins in the meteorite JeseniceBojan Ambrožič, Sašo Šturm, Mirijam Vrabec, 2025, original scientific article Abstract: Meteorite Jesenice is a weakly (S3) shocked ordinary chondrite from Slovenia. The shock event was violent enough to cause localized partial melting of the meteorite and the formation of shock veins. Inside the shock veins, metal-sulfide globules were found, which provided evidence for a post-shock cooling rate of 2.2·105 Ks–1 – 7.4·103 Ks–1. From the mineral paragenesis of the shock veins, shock pressure and peak shock temperature were deduced as 2.5–15 GPa and 1500–2150 °C, respectively. We provide evidence that shock veins were formed via a shear and friction mechanism. Furthermore, the confirmed presence of ordered FeNi metal (tetrataenite) found in the matrix indicates that the shock occurred in the parent body of the meteorite Jesenice.
Keywords: chondrite, shock stage, shock veins, metal-sulfide globules, tetrataenite, transmission electron microscopy
Published in DiRROS: 24.12.2025; Views: 47; Downloads: 16
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24. Switchable behavior of ▫$Ru–TiO_2$▫ catalysts in HMF conversionBabar Amin, Jaroslav Aubrecht, Oleg Kikhtyanin, Evgeniya Grechman, Gustavo Andrade Silva Alves, Alberto Tampieri, Karin Föttinger, Marcin Jędrzejczyk, Agnieszka M. Ruppert, Francisco Ruiz-Zepeda, David Kubička, 2025, original scientific article Keywords: Ru/TiO2 catalysts, hydrogenation, hydrogenolysis, 5-hydroxymethylfurfural, 5-methylfurfural, 2, 5-bis(hydroxymethyl)furan
Published in DiRROS: 24.12.2025; Views: 51; Downloads: 29
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25. Ukrepi za izboljšanje delovnih pogojev pri platformnem delu : ključni izziviGrega Strban, Katarina Kresal Šoltes, 2025, original scientific article Abstract: Platformno delo je sodobna oblika nestandardnega organiziranega in plačanega dela, ki poteka preko digitalne platforme dela, ki organizira, vodi in nadzoruje delovni proces s pomočjo avtomatiziranih sistemov spremljanja in odločanja, tako imenovanega algoritemskega upravljanja. Platformno delo sodi na področje uporabe visokotveganih sistemov umetne inteligence (UI), prav tako so osebe, ki opravljajo platformno delo v bolj tveganem delovno in socialnopravnem položaju in zato lahko izpostavljene povečanemu tveganju za prekarnost. To sta tudi ključna izziva pri reguliranju ukrepov za izboljšanje delovnih pogojev pri platformnem delu.
Keywords: digitalna platforma dela, platformno delo, umetna inteligenca, prekarnost, dostojno delo, digitalizacija, algoritmično upravljanje
Published in DiRROS: 24.12.2025; Views: 53; Downloads: 14
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27. Growth rates of the critically endangered fan mussel Pinna nobilis in the Slovenian sea (northern Adriatic)Valentina Pitacco, Ana Fortič, Domen Trkov, Borut Mavrič, Ciril Mlinar, Lovrenc Lipej, 2025, original scientific article Abstract: The fan mussel Pinna nobilis is a bivalve endemic to the Mediterranean Sea that is listed as Critically Endangered on the IUCN Red List. Its decline is due to a disease that has led to mass mortalities throughout the Mediterranean. The Gulf of Trieste (northern Adriatic) used to harbour one of the densest populations of P. nobilis, but since 2019, it has also been affected by this disease. The aim of this work was to analyse the growth of P. nobilis in the Slovenian part of the Gulf, with 3 case studies: (1) in situ measurement of adults before the mass mortality event (MME), (2) in situ measurement of juveniles after the MME and (3) ex situ measurement of juveniles kept in the laboratory. The pre-MME growth rate was comparable to that in other areas of the Gulf. In the first years of life, the growth rate of P. nobilis is higher than the growth rate reported in the southern Adriatic, and comparable to the growth rate in the Spanish lagoons. This is probably related to the physico-chemical conditions and confirms the potential of the area for restoration actions. Captive growth of juveniles could be an effective conservation measure, although juveniles kept in the laboratory grow more slowly than those in the sea, probably because of their lower immune response. Temperature plays an ambivalent role, as it increases the growth rate but also triggers the parasites responsible for the MME, which is of concern, given the recent rise of seawater temperatures and heatwaves.
Keywords: fan mussel, model growth, temperature, conservation, northern Adriatic sea
Published in DiRROS: 23.12.2025; Views: 83; Downloads: 41
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28. Multilevel toxicity assessment of polypropylene microplastics and pyrene on mussels : DNA damage, oxidative stress, and physiological effectsTatjana Mijošek Pavin, Margareta Kračun-Kolarević, Stoimir Kolarević, Tatjana Simčič, Rajko Martinović, Oliver Bajt, Gabriela Kalčíková, Andreja Ramšak, 2026, original scientific article Abstract: Despite extensive research on microplastic pollution, combined biological effects of microplastics and associated pollutants on marine invertebrates remain unclear. We present an integrative assessment of polypropylene (PP) and pyrene, individually and in co-exposure, in mussel Mytilus galloprovincialis. Mussels were exposed to 1 mg L−1 PP (~40 μm) and 50 μg L−1 of pyrene for 7 and 14 days, representing a scenario relevant to highly polluted coastal areas. DNA damage increased significantly in mussels exposed to pyrene or PP alone, but remained at control levels under combined exposure, suggesting an interaction that may reduce genotoxic potential. Lipid peroxidation remained stable across treatments, despite significant changes in antioxidant enzymes. Catalase activity increased in pyrene and pyrene + PP treatments, with tissue-specific trends, indicating enhanced antioxidant protection. Glutathione S-transferase activity was stable in digestive glands but significantly inhibited in gills after seven days under PP exposure. ETS activity increased in pyrene-containing treatments after 14 days, reflecting elevated metabolic demand after prolonged exposure. Respiration rate declined under PP exposure. Heart rate recovery time after the hyposalinity test was the slowest in the pyrene + PP group, indicating compromised physiological resilience. These findings reveal interactive, tissue- and biomarker-specific effects of PP and pyrene. Their combination suggested attenuation of genotoxicity but enhanced physiological stress responses, highlighting the complexity of pollutant interactions and importance of evaluating multiple biomarkers, tissues and pollutants. Presented data provide the first ever biomarker-based evaluation of PP and pyrene co-exposure, offering novel insights into microplastic-pollutant interactions and potential ecological consequences for marine invertebrates.
Keywords: mussels, microplastics, PAHs, multi-biomarker approach, co-exposure
Published in DiRROS: 23.12.2025; Views: 77; Downloads: 38
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