Abstract
The physical, chemical and microscopic changes brought about by the intrusion of a mica-peridotite dyke in the Dishergarh seam have been investigated.
The vitrain bands show distortion, folding and fading of lustre. Near the contact the coal is converted into ‘jhāmā’ which shows columnar structure.
The chemical characteristics of the coal show more rapid changes on approaching the dyke. The coal has been affected up to a distance of 8 feet from the contact or slightly beyond, but is practically unaltered at a distance of 11 feet.
The microstructures of fusain have not been affected. Vacuoles and cracks appear in the vitrain bands which increase in number and size as the dyke is approached. These are now filled with secondary mineral matter.
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Communicated by Prof. L. Rama Rao,f.a.sc.
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Ganju, P.N., Pant, I.D. Effects of a mica-peridotite dyke on the dishergarh seam in the sodepur colliery, raniganj coalfield. Proc. Indian Acad. Sci. 55, 307–319 (1962). https://doi.org/10.1007/BF03052239
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DOI: https://doi.org/10.1007/BF03052239