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1475. Fitoplankton, model kompleksnostiIvano Vascotto, Patricija Mozetič, Janja Francé, 2024, professional article Keywords: fitoplankton, biološka raznovrstnost, združbe, periodičnost, okoljski dejavniki, Tržaški zaliv, morska biologija
Published in DiRROS: 09.07.2024; Views: 337; Downloads: 202
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1476. PETRI-MED: Advancing satellite-based monitoring for microbial plankton biodiversity in the Mediterranean SeaTinkara Tinta, Janja Francé, Katja Klun, Martin Vodopivec, Neža Orel, Patricija Mozetič, Vesna Flander-Putrle, 2024, published scientific conference contribution abstract Keywords: biodiversity, remote sensing, oceanography
Published in DiRROS: 09.07.2024; Views: 349; Downloads: 139
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1478. Tectonics and gravitational phenomena, part two : the Trnovski gozd-Banjšice-Šentviška Gora degraded plainLadislav Placer, Tomislav Popit, Igor Rižnar, 2024, original scientific article Abstract: The article describes the recent conditions at the Paleogene thrust contact between the External Dinaric Thrust Belt composed of carbonate rocks and the External Dinaric Imbricate Belt composed of flysch rocks, geographically, between the Trnovski gozd (Trnovski gozd plateau) and the Vipava Valley at the northwestern end of the Dinarides. Fossil and recent gravity-related phenomena that indicate the uplift of the southwestern edge of the External Dinaric Thrust Belt and the larger complex in the hinterland are found there. However, these phenomena are not related to the reactivated Paleogene thrust tectonics, but to the Neogene-recent underthrusting as a consequence of the Microadria (Adriatic Microplate) movement towards the Dinarides. Only arguments for these processes are presented in this article.
Keywords: External Dinarides NW, geomorphology, gravitational phenomena, karst plains, degraded karst plains, Idrija fault
Published in DiRROS: 09.07.2024; Views: 298; Downloads: 149
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1479. Isotopic composition of carbon (▫$\delta$▫13C) and nitrogen (▫$\delta$▫15N) of petrologically different tertiary lignites and coalsTjaša Kanduč, Miloš Markič, 2024, original scientific article Abstract: This study investigates the carbon (δ13Corg) and nitrogen (δ15N) isotopic composition of tertiary lignites and coals from six sedimentary basins: Velenje, Mura-Zala, and Zasavje in Slovenia; Sokolov in Czech Republic, Barito in Indonesia; and Istria in Croatia. The aim is to investigate the correlation between the fine detrital (fD) component and δ13C and δ15N in Velenje lignite samples. Additionally, we aim to evaluate the biogeochemical processes of organic substances during their deposition in all analyzed samples, calculate their δ13CCO2 values and compare the analyzed values of δ13C and δ15N to those reported in the literature. Thirty-two samples were analyzed, predominantly from the Velenje ortho-lignite (Pliocene), with additional lignites and coals from the Pannonian to Paleocene epochs for comparison. Carbon isotopic composition (δ13Corg) ranged from -27.9 to -23.6 ‰, and nitrogen isotopic composition (δ15N) ranged from 1.8 to 7.4 ‰. The fine-detrital lithotypes of the Velenje ortho-lignite exhibited the most negative δ13Corg values due to anaerobic bacterial activity in an intramontane alkaline lake environment influenced by the carbonate hinterland. Moreover, gelification processes affected fine-detrital organic matter more than larger wooden pieces. Terbegovci, Hrastnik meta-lignites, and Barito sub-bituminous coal also displayed low δ13Corg values, indicating limited gelification, while variations in the δ15N values suggested differences in mineralization. The Velenje xylitic lithotypes have higher δ15N values, indicating a more intense mineralization under aerobic conditions. Raša ortho-bituminous coal, deposited in a brackish environment, displayed the highest δ13Corg values and a wide range of δ15N values due to fluctuating water tables in a paralic carbonate platform environment. The lowest δ15N value was observed in the Sokolov Basin lignite coal, indicating minimal mineralization and low bacterial activity. The isotopic composition of CO2 in air (δ13Cair), which was calculated using the δ13C values in lignites and coal, ranged from -8.4 to -3.4 ‰, with Velenje lignite displaying the minimum value and Raša coal showing the maximum value. The determined δ13C and δ15N values of the coal and lignite samples in this research fall within the typical range of world coals.
Keywords: lignite, coal, petrography, C and N isotopic composition, gelification, mineralization
Published in DiRROS: 09.07.2024; Views: 263; Downloads: 120
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1480. Middle Triassic deeper-marine volcano-sedimentary successions in western SloveniaDragomir Skaberne, Jože Čar, Maja Pristavec, Boštjan Rožič, Luka Gale, 2024, original scientific article Abstract: A Ladinian – Carnian volcano-sedimentary succession from western Slovenia, paleogeographically belonging to the western Slovenian Basin, is presented in 17 sections. Except for the lowermost part, which is dominated by volcanics and volcaniclastics, most of the succession is dominated by shale, sandstone, and micritic limestone. Various authors use the name Pseudozilja and/or Amphiclina formation for this part, which is dominated by clastics, but they disagree on the differences between the formations. The lower Pseudozilja formation, represented by the Malenski Vrh section, comprises diabase, tuf and shale. No substantial differences in lithological composition have been observed between the upper Pseudoziljaformation and the Amphiclina formation, which are predominantly composed of shale, sandstone, and limestone. The shale and sandstone are largely composed of quartz, feldspar, and lithic grains (especially volcanics), which vary in proportions. Limestone varieties comprise hemipelagic limestones and resedimented carbonates deposited by gravity-flows. Deposition of the Ladinian – Carnian volcano-sedimentary succession took place on or near the continental slope that was generally inclined to the S, with the direction of transport mainly from N to S.
Keywords: stratigraphy, carbonate-siliciclastic deposits, Slovenian Basin, Middle Triassic, Ladinian, Carnian, Pseudozilja formation, Amphiclina formation
Published in DiRROS: 09.07.2024; Views: 267; Downloads: 115
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