Abstract

"Coal analyses from bores and shafts within the Kent coalfield, England, show that not only does the average percentage of volatile matter decrease with increasing depth, but that the rate of decrease progressively decreases towards the present centre and high-rank part of the coal basin. This change in rate is apparently due to differences in the geothermal gradient and cannot be explained by the uniformly gentle deformation of the coal measures. The geothermal gradient is thought to have decreased towards the centre of the basin at the time of greatest burial, in the same way as geothermal gradients usually decrease towards areas of thicker sediments at the present time."

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