Showing papers in "International Journal of Coal Geology in 1994"

TL;DR: Petrographic and chemical variability in two tropical, low ash, domed peat deposits of similar age and physiographic setting, but different external morphology, were examined as modern analogues for coal as mentioned in this paper.

TL;DR: In this article, the authors used the kinetic EASY%R0 approach for the calculation of vitrinite reflectance in the coal-bearing Ruhr basin (western Germany) using one-dimensional basin modelling techniques.

TL;DR: The mineralogy, elemental composition, and modes of occurrence of 49 elements in nine composite samples of Bobov Dol high-ash coals were studied by optical microscopy, scanning and transmission electron microscopy and chemical analysis as discussed by the authors.

TL;DR: In this paper, a succession of Late Permian coals of high-volatile bituminous to semi-anthracite rank have been identified, using low-temperature oxygen plasma ashing and X-ray diffraction, and evaluated to identify the relative roles in mineral matter formation of detrital input, early diagenesis in the peat swamp and late deagenesis associated with rank advance.

TL;DR: A critical analysis of various genetic and physical factors associated with certain Early and Late Permian and Oligocene coal seams and early Eocene lignite seams of India revealed that the high secondary porosity and small particle size, irrespective of petrographic and rank properties in sub-humid climate, favour spontaneous combustion as discussed by the authors.

TL;DR: In this paper, a set of 466 individual full channel samples (coals, coaly shales and partings) of thirteen Bulgarian coal deposits, as well as vitrain lenses, gagatite and coalified woods embedded in sedimentary rocks have been analyzed by atomic emission spectroscopy.

TL;DR: In this paper, petrographical analysis of coal and coal measure sequences in the area around the Obi/Lafia part of the Middle Benue Trough of Nigeria were studied.

TL;DR: In this paper, a semi-quantitative method was developed that is based on statistical analyses of the concentration and morphology of zircons and their spatial distribution patterns, which can be used to reconstructing volcanic ash-fall dispersal patterns.

TL;DR: In this paper, the authors studied the coal bed of the Middle Pennsylvanian Breathitt Formation in eastern Kentucky and inferred that the sandstone bodies are a result of post-depositional fluvial activity and the disturbance of coal between washouts is due to compaction-related slumping.

TL;DR: In this article, the anatomical characteristics of peatified Calluna vulgaris stems isolated from a selection of Northwest European raised bog peat deposits were compared with intact stems in order to reveal anatomical modifications caused by the peatification process.

TL;DR: Petrographic, palynologic and geochemical characteristics of the No. 5 Block coal bed have been described in this paper, and the authors report on some temporal and spatial trends among these parameters in eastern-northeastern Kentucky.

TL;DR: In this article, the Mary Lee coal bed was studied from vertical increment samples along an inferred mire interior to mire margin transect to determine if any vertical or lateral changes in coal composition could be detected.

TL;DR: In this paper, the generation of gas in selected coal seams of the Zonguldak basin (northwestern Turkey) has been modelled by incorporating laboratory-derived non-isothermal reactions kinetics into the geothermal histories of the coal-bearing strata.

TL;DR: In this paper, 15 lignite samples from the province of Yunnan were analysed by organic petrography and geochemistry and it was concluded that the Baipao coal was formed from the same plant source material as the normal coal, but underwent stronger decay.

TL;DR: In this paper, two series of samples, grain series (GS) and block series (BS), with different particle size (between 0.5-1.0 mm and 1.5×5.0 cm) and rock geometry (irregular and prismatic, respectively), were obtained from an oil shale with Type II kerogen from Cantabria (Northern Spain).

TL;DR: In this article, coal and clastic facies investigations of a Paleocene coal-bearing succession in the Grass Creek coal mine, southwestern Bighorn Basin, Wyoming, USA, suggest that disruption of peat accumulation in recurrent mires was caused by the repetitive progradation of crevasse splays and, ultimately, by a catastrophic mass movement.

TL;DR: The Nissi peatland as mentioned in this paper is located in a 12 km 2 intramontane basin in northwestern Greece, and it is composed mainly of Cyperaceae (Cladium mariscus and Carex species) and Phragmites australis.

TL;DR: In this paper, it was shown that the composition of I/S mixed-layer clays depends mainly on processes associated with the source of the original sediment input, and that the illitization appears to be related to the burial depth and/or coal rank.

TL;DR: In this paper, a pattern recognition based technique has been used to classify the different constituents (macerals) of coal, which has two modules, an off-line training module and an online classification module.

TL;DR: In this paper, it is suggested that the organic matter and humic acids played a critical role in the precipitation of sulphide ore minerals as reductants of partly oxidized, sulphur and metal-bearing, hydrothermal, ascending solutions.

TL;DR: The McLeansboro Group in the Western Kentucky coal field spans the upper Desmoinesian (Westphalian D) and the Missourian and Virgilian series (Stephanian).

TL;DR: In this paper, the maturity and source rock potential of the Garumnian coals in the central Pyrenees of Spain were investigated using reflected light and fluorescence microscopy, and the results indicated that the rank of the samples correspond to an immature diagenetic state close to the lower oil window and allows classification of this coal as subbituminous.

TL;DR: In this article, an effort has been made to study the coal facies with the help of maceral content, microlithotypes, chemical constituents of coal and by depositional milieu.

TL;DR: Fluorescence spectra, from 540 nm to 700 nm, were obtained from the major microscopically identifiable components of a high volatile and a medium volatile coal component as mentioned in this paper.

TL;DR: In this article, a time-stratigraphic correlation with the available data on maturity of vitrinite for some selected wells in the Broach Depression of the Cambay Basin is presented.

TL;DR: A parameter called Undiscovered unit regional resources was formulated and studied for the Gondwana coal resources of India with a view to developing a quick method of estimating undiscovered mineral resources of a region superior to that of Unit Regional Value and Unit Regional Weight as discussed by the authors.