Sulphur and carbon isotopic composition of power supply coals in the Pannonian Basin, Hungary |
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| Authors: | Mria Hmor-Vid Tams Hmor |
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| Institution: | aEötvös Lorand Geophysical Institute of Hungary, H-1145 Budapest, Kolumbusz st. 17-23, Hungary;bHungarian Geological Survey, H-1143 Budapest, Stefánia st. 14, Hungary |
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| Abstract: | The present work is an attempt to establish the stable isotope database for Mesozoic to Tertiary coals from the Pannonian Basin, Hungary. Maceral composition, proximate analysis, sulphur form, sulphur isotopes (organic and pyritic), and carbon isotopes were determined. This database supports the assessment of the environmental risks associated with energy generation, the characterization of the formation and the distribution of sulphur in the coals used.The maceral composition, the sulphur composition, the C, S isotopic signatures, and some of the geological evidences published earlier show that the majority of these coals were deposited in freshwater and brackish water environments, despite the relatively high average sulphur content. However, the Upper Cretaceous, Eocene, and Lower Miocene formations also contain coal seams of marine origin, as indicated by their maceral composition and sulphur and carbon chemistry.The majority of the sulphur in these coals occurs in the organic form. All studied sulphur phases are relatively rich in 34S isotopes (δ34Sorganic = + 12.74‰, δ34Spyrite = + 10.06‰, on average). This indicates that marine bacterial sulphate reduction played a minor role in their formation, in the sense that isotopic fractionation was limited. It seems that the interstitial spaces of the peat closed rapidly during early diagenesis due to a regime of high depositional rate, leading to a relative enrichment of the heavy sulphur isotopes. |
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| Keywords: | Coal Coal petrology Stable sulphur and carbon isotopes Pannonian Basin Hungary |
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