Contact zones with mica peridotite intrusions have been studied in ten Permian coal seams of the lower Gondwana coal fields, Bihar. Carbon and hydrogen contents and reflectance show a sharp change near the contact. Comparison of the reflectance measurements of natural cokes with those of laboratory carbonized coals suggests that the pressure effect of the intrusion was negligible and that the maximum temperature of metamorphism was about 600 degrees C.

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