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PETROLOGICAL AND ORGANIC GEOCHEMICAL CHARACTERISTICS OF LIGNITES FROM THE CZECH REPUBLIC
Abstract
Organic matter of lignites from five Tertiary deposits in the Czech Republic was studied and the general goal was to characterize a series of different coal lithotypes in relation to depositional environment from the viewpoint of organic petrology and geochemistry. Coal samples were chosen to cover various lithotypes: xylite rich coals, matrix coals, liptobioliths, and sapropelic coals. The samples differ in ash, sulphur, carbon, hydrogen, oxygen and volatile matter contents, and calorific values. Xylite rich and matrix coals are characterized by higher ulminite, densinite and lower textinite and resinite contents. Sapropelic coal from the North Bohemian and \vZitava basins are formed by large amount of huminite macerals and high portion of liptodetrinite, sporinite and alginite. Different composition was found in clayey sapropelic coal from the Uheln\'a relic that contains more liptodetrinite, alginite and sporinite, and lower content of huminite macerals. Fundamental essential difference between sapropelic coal and liptobioliths consists in high contents of liptodetrinite, bituminite, resinite, inertinite, and lower contents of clay minerals in liptobioliths. Representation of n-alkanes according to coal lithotypes was interesting because identical trends in distribution were found. Long n-alkanes were dominant in liptobioliths and sapropelic coals. The middle-chain n-alkanes prevailed in xylite rich coals. The short-chain n-alkanes were intensive in matrix coals. The fossil pattern of biomarkers is indicative of their derivation from natural products: sesquiterpenoids of cadalene group and the diterpenoid $\alpha$-phyllocladane were the most abundant compounds found in lignite samples.
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References13
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