The distribution of sulphur in upper cretaceous brown coals from Ajka (Central Transdanubia, Hungary)
In this study 25 brown coal samples have been examined from Ajka (J6kai mine). The total sulphur content of the studied Upper Cretaceous brown coals is highly variable abundances range from 2.1% to 9.7%, mean 5.1%. The dominant sulphur forms found in the samples were pyritic and organic sulphur. The...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1996
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| Sorozat: | Acta mineralogica-petrographica
37 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24836 |
| Tartalmi kivonat: | In this study 25 brown coal samples have been examined from Ajka (J6kai mine). The total sulphur content of the studied Upper Cretaceous brown coals is highly variable abundances range from 2.1% to 9.7%, mean 5.1%. The dominant sulphur forms found in the samples were pyritic and organic sulphur. The sulphur content of the brown coals is generally less than 0.3%, the mean -0.15%. However, there is a difference between the distribution of sulpur in the lower and upper coal beds of the mine. The brown coal samples taken from the I я bed can be characterized by extremely high total sulphur values (mean 7.5%!), where the pyritic sulphur is dominating giving 65% of the total sulphur content. In the 3rd 4 th , 5th and 6th coal beds of the lower coal series the prevalence of organic sulphur (270%), an average of ~20% pyritic sulphur and a minimal sulphate sulphur content can be traced. These latter distributions of the sulphur content are very similar to the values experienced during the earlier analyses of the average sulphur content of Transdanubian brown coals, the sequence is organic sulphur > pyritic sulphur > sulphate sulphur. The wide range of the total sulphur content within the individual coal beds - save the 6th one - refers to their heterogenous nature. The inorganic contents of the coal measures are also different, the average ash content of the samples taken from the coal beds showed an upward increase. The high sulphur content of the coals of J6kai mine can be explained by the fact that they were deposited in a brackish or marine-influenced environment. The really high pyrite content of the 1st bed might be explained by the presence of interbedding elayish inorganic layers within the coal beds, while the high organic sulphur content of the lower coal series may reflect the influence of the carbonate rocks giving the bottom of seams and the low concentration of available reactive iron during peat formation and diaganesis. |
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| Terjedelem/Fizikai jellemzők: | 89-98 |
| ISSN: | 0365-8066 |