Composition and properties of North Bohemian coals

Abstract

This work presents the mean chemical, micropetrographic, surface and other characteristics of coal seams from western, central, and eastern parts of the North Bohemian brown coal basin. Attention was especially paid to the elemental composition, ash content, content and forms of sulphur, occurrence of syngenetic and epigenetic sulphides, maceral composition, and degree of gelification and decomposition of components in the huminite maceral group. Some other coal characteristics were also assessed, such as pore texture, extractability and solvent swelling of the coals.The coals examined were huminitic with a variable xylite and detrite content. Huminite reflectance varied between 0.33 and 0.39%. Substantial differences in pore texture of the coals were found in the range of meso-and macropores. These differences largely affected the extractability of the North Bohemian coals. The coals also exhibited extremely high swelling ratios in basic solvents, such as pyridine.

Interplay between tectonics and compaction in a rift‐margin, lacustrine delta system: Miocene of the Eger Graben, Czech Republic

“…The seam contains several thin interbeds of clay in the study locality, one of which is up to 2 m thick (Mach, 2002). According to Sýkorová et al. (1997), the bulk of lignite in the study area is characterized by a xylitic‐detritic composition represented by macerals of huminite and liptinite groups, 15·7% average ash content, and reflectance ( R o ) of 0·36.…”

Depositional record of an avulsive fluvial system controlled by peat compaction (Neogene, Most Basin, Czech Republic)

“…This interaction between clastic sedimentation and an accumulation of organic material in the mire resulted in a significant heterogeneity of the resulting lignite seam which is characterized by a number of silty to sandy interbeds. According to Sý korová et al (1997), the lignite in the study area is characterized by 15AE7% average ash content, reflectance (R o ) of 0AE33 and xylitic-detritic composition. The climatic conditions during activity of this depositional system can be characterized as optimal warm-temperate, very humid, probably with a lower humidity during the winter, as assumed by Kvaček (1998) for the nearby Bílina Delta.…”

“…This interaction between clastic sedimentation and an accumulation of organic material in the mire resulted in a significant heterogeneity of the resulting lignite seam which is characterized by a number of silty to sandy interbeds. According to Sýkorová et al. (1997), the lignite in the study area is characterized by 15·7% average ash content, reflectance ( R o ) of 0·33 and xylitic–detritic composition.…”