Coal in Bukovinka Formation (Eggenburgian, Southern Slovakia)


Authors: Vass D, Pereszlény M, Milička J, Bartek V

Published in: Bulletin of Geosciences, volume 74, issue 2; pages: 131 - 134;

Keywords: coal, pyrolysis, climate changes, Eggenburgian, Ottnangian,

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The main coal bearing formation in Southern Slovakia is Salgótarján Fm. (Ottnangian). The coal bearing Pôtor Member contains 3 seams. However, there are coal occurrences in Bukovinka Fm. (Eggenburgian), too (Čechovič 1952). By recent coal prospection to the North of mine district Baňa Dolina (Veľký Krtíš) the coal seam of Bukovinka Fm. was penetrated by the well VVL-8 drilled nearby the village of Veľký Lom. The thickness of the seam is of 3.8 m.
The comparison of qualitative and organic geochemistry parameters of the coal in Bukovinka Fm. and the 3rd seam of Pôtor Mb shows that the kerogen of both coal seams is of type III. (methan prone) coming from higher (woody) plants. But the quality of Bukovinka Fm. coal is significantly lower. It can be explained by different climatic conditions in which coal originated. When the Bukovinka Fm. was deposited an arid and hot climate dominated. The dry weather limited the vegetation. Even during the short humid periods documented by plant remmants (mostly leaf imprints) of tropical - subtropical rain forest, the remnants of coal forming plants as Taxodiaceae and Glyptostrobus sp. are missing.
On the other hand the sporomorph assemblage coming from Pôtor Mb. is rich in Taxodiaceae Nyssaceae, Myricaceae, Cyrillaceae, Symplocaceae and the subtropic elements are suppressed (Planderová in Vass, Elečko et al., 1992). The assemblage documents humid but cooler climate.