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ABSTRACT: Liptinite-rich Permian coals of the Moher sub-Basin, Singrauli, India

Singh, Akhilesh, Krish K. Sappal
Curtin University Of Technology, Perth, Australia

The Moher sub-basin, of the Singrauli Coalfield, is located in the central-east part of India. It is one of the important non-coking coal producing sub-basin in the country with a proven reserve of about 3400 million tonnes. The sub-basin consists of Lower Gondwana sediments of Permian in age. The Early-Permian Barakar Formation contains three economic coal seams namely; Turra (12-24m), Purewa Bottom (9-14m) and Purewa Top (8-12m) with partings of 40-60m and 0- 45m respectively. Jhingurdah Top (90-125m) and Jhingurdah Bottom (10 -15m) seams with parting of 27-45m are associated with the Late-Permian Raniganj Formation.

Petrographic investigation of representative samples of the sub-basin coal was carried out for an overall evaluation. The coals were sub-bituminous in rank and showed normal increase in rank with depth. The western parts of the sub-basin coals were higher in rank than the eastern basin coals. The Early-Permian Turra seam had higher amount of leptinite macerals relative to the Late-Permian Jhingurdah seam.There was also a relationship between the total amount and composition of inertinite content. The high reflecting inertinites were common in coals with low inertinite content where as the low reflecting (reactive) inertinites were commonly associated with the coals rich in inertinite.

The Permian coals of India are known to have a common occurance of vitrinites, rich in inertinites and mineral matters with low leptinit macerals. However, the quantitative assessment of the sub-basin coal under florescence microscopy, showed considerably higher amount of leptinite macerals (12-60% on mmf basis) with subordinate vitrinite and inertinite macerals.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia