Abstract
Hand-selected lithotypes of a Polish subbituminous coal were examined using organic-geochemical methods and microscopy. The random reflectance of the vitrinite was determined to be 0.52%. Chemical analysis of solvent extracts showed that in this rank region the intra-seam diffusion of bitumen present in the coal is of minor importance. Thus the lithotypes vitrain, durain and fusain each possess significant geochemical characteristics. The extract of the vitrain concentrate is enriched in degradation products of resinous material impregnating the whole vitrain. The fusain concentrate is characterized by a relatively high content of short-chain normal alkanes (C 15-C 20) and the main feature of the durain is its high pristane content. This indicates a distinct organic matter input or particular diagenetic conditions during coal lithotype formation.
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