Sen, Subhasis (1979) Genesis of lithotypes and banding of Indian Lower Gondwana Coals. Journal of Mines, Metals & Fuels, 27 (6). pp. 181-184. ISSN 0022-2755

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In India, an ideal condition of coal seam formation prevailed immediately at the end of the Talcher glaciation when vegetal debris of the luxuriant Glossopteris flora were drifted and accumulated in a number of continental troughs aligned along important river valleys. The dominant lithotype in coals of Lower Permian period is durain, frequently occurring in intimate as sociation with fusain, argillaceous mineral matter and distinct microlayers of vitrian. Occurrence of vitrain is more common in coals of upper horizons, especially in those of Upper Permian, reflecting a changed environmental condition during the initial biochemical stage. It is suggested that the drift woods were affected to various degrees by physical attrition, chemical degradation and microbial attack before their deposition in a water-logged shallow depression. Two main phases were thus produced-namely, a colloidal hydrosol and a residual drift wood-impoverished in cellulose content. The former occupied the upper layer of the water-logged basin where they were brought in by flowing water and subsequently formed bayers of dopplerite-the precursor of vitrain. The residual part of the wood comprising lignin-rich cell walls, waxes, resins, spores etc. drifted together with argillaceous mineral matter and deposited as clastic sediments forming various layers such as durain, shlay coal, carbonaceous shale, shale in the descending order.

Item Type: Article
Subjects: Coal Preparation
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 22 May 2012 07:07
Last Modified: 22 May 2012 07:07

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