GEOCHEMICAL JOURNAL
Online ISSN : 1880-5973
Print ISSN : 0016-7002
ISSN-L : 0016-7002
An isotopic study of the role of carbon dioxide in outbursts in coal mines
J. W. SmithK. W. Gould
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1980 年 14 巻 1 号 p. 27-32

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The occurrence of instantaneous outbursting in the Bulli coal seam at the West Cliff Colliery, Appin, NSW can be correlated directly with an increase in concentration (0.5 to 75%) and a related decrease in the 13C content (δ13C +16 to -8‰ PDB) of the CO2 in the seam gas. Two sources of CO2 are required. The greater incidence of outbursting in CO2-rich zones is explained by the conversion to bicarbonate of cleat and fracture filling calcite deep within the coal and the transport of this bicarbonate in water to mine openings. The weakening of the resistance of the coal to shear by this removal of carbonate is an additional factor to be considered in assessing outbursting situations.
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© Geochemical Society of Japan
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