20.500.12556/DiRROS-19209 Isotopic composition of carbon (▫$\delta$▫13C) and nitrogen (▫$\delta$▫15N) of petrologically different tertiary lignites and coals Izotopska sestava ogljika ([delta]13C) in dušika ([delta]15N) petrološko različnih terciarnih lignitov in premogov 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. Ta raziskava proučuje izotopsko sestavo ogljika in dušika (δ13Corg in δ15N) terciarnih lignitov in premogov iz šestih sedimentacijskih bazenov: Velenje, Mura-Zala in Zasavje v Sloveniji; Sokolov na Češkem; Barito v Indoneziji; in Istri na Hrvaškem. Cilj je iskati korelacijo med fino detritno (fD) komponento in δ13Corg, δ15N v velenjskih lignitnih vzorcih ter oceniti biogeokemične procese organske snovi med odlaganjem v vseh analiziranih vzorcih, izračunati δ13CCO2 ter primerjati analizirane vrednosti δ13C in δ15N z objavljeno literaturo. Analiziranih je bilo dvaintrideset vzorcev, večinoma iz Velenjskega orto-lignita (pliocen), za primerjavo pa še ligniti in premogi od panonijske do eocenske starosti. Izotopska sestava ogljika (δ13Corg) vseh vzorcev se je spreminjala od -27,9 do -23,6 ‰, in izotopska sestava dušika (δ15N) od 1,8 do 7,4 ‰. Fino-detritni litotipi Velenjskega orto-lignita so pokazali najbolj negativne vrednosti δ13Corg zaradi anaerobne bakterijske aktivnosti v intramontanem alkalnem jezerskem okolju pod vplivom karbonatnega zaledja. Procesi gelifikacije bolj vplivajo na drobno-detritno organsko snov kot na večje lesne ostanke. Meta-ligniti iz Terbegovcev in Hrastnika ter Barito sub-bituminozni premog so prav tako pokazali nizke vrednosti δ13Corg, kar kaže na omejeno gelifikacijo. Spremembe v δ15N kažejo na razlike v mineralizaciji. Velenjski ksilitski litotipi so pokazali višjo δ15N, kar kaže na bolj intenzivno mineralizacijo v aerobnih pogojih. Raški orto-bitumenski premog, odložen v brakičnem okolju, je pokazal najvišjo δ13Corg in širok razpon δ15N vrednosti zaradi nihajočih vodnih nivojev v paraličnem karbonatnem platformnem okolju. Najnižja δ15N je bila opažena v lignitnem premogu iz Sokolovskega bazena, kar kaže na minimalno mineralizacijo in nizko bakterijsko aktivnost. Izotopska sestava CO2 v zraku (δ13Cair), ki je bila izračunana iz δ13C v lignitih in premogih se je spreminjala od -8,4 do -3,4 ‰, pri čemer je velenjski lignit pokazal najnižjo vrednost, raški premog pa najvišjo. Določene vrednosti δ13C in δ15N vzorcev lignita in premoga v tej raziskavi padejo znotraj razpona svetovnih premogov. lignite coal petrography C and N isotopic composition gelification mineralization lignit premog petrografija izotopska sestava C in N gelifikacija mineralizacija true false true Geološki zavod Slovenije Angleški jezik Slovenski jezik Neznano 2024-07-09 08:42:49 2024-07-09 08:42:50 2024-07-10 03:52:50 0000-00-00 00:00:00 2024 0 0 str. 105-128 no. 1 vol. 67 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2024-06-11 55 1854-620X 10.5474/geologija.2024.006 198781955 1887-Article_Text-12342545-1-10-20240611.pdf 1887-Article_Text-12342545-1-10-20240611.pdf 1 4CFF65DDF596705CE435E85F57374BFA 0428fc8732e5f53ee1cf88e84d067baf416c0bfaae67537613a423911d0fcfae 46891d37-3dbf-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=26446 Geološki zavod Slovenije Geologija 0 0 0