Panda, Mahima and Equeenuddin, Sk. Md. and Mohanty, Debadutta (2022) Organic petrography and stable isotopic characteristics of Permian Talcher coal, India: Implications on depositional environment. International Journal of Coal Geology , 264. ISSN 0166-5162

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Abstract

The depositional environment of coal generally controls its chemical composition, physical properties, and utilization potential. Therefore, the present study investigates the depositional environment of the Talcher coal, which represents the single largest coal reserve in India, based on proximate, ultimate and petrography analyses, as well as on the determination of stable carbon (δ13C) and nitrogen (δ15N) isotopic composition. The Talcher coal is classified as sub-bituminous to high volatile bituminous rank based on the vitrinite reflectance (0.40–0.59%), volatile matter (43.0–55.1%), and carbon content (71.2–79.3%). The ash yield varies from 12.4 to 39.3%. Petrographically, the coal is dominated by vitrinite (48.4–64.2%) followed by inertinite (21.4–36.2%) and liptinite (10.0–16.8%). The mesotrophic to rheotrophic water conditions in the palaeomire is deciphered by the vitrinite to inertinite ratio (V/I) and the groundwater index (GWI). The coal was formed in a telmatic environment where forested vegetation prevailed. The recorded TPI values (>1) indicate a high tree density. The δ13C and δ15N values of Talcher coal range from −23.7‰ to −21.7‰ and +0.6‰ and +3.4‰, respectively. The total organic carbon to total nitrogen ratio (TOC/TN) of the coal lies between 20 and 40, which reflects the dominance of vascular higher terrestrial plants as the source vegetation. The δ13C composition of coal corresponds to that of the C3 land plants. Both δ13C and δ15N composition of Talcher coal falls within their respective global coal values. The δ13C composition of the palaeoatmospheric CO2 (δ13Cair) is found to be −3.7 ± 0.5‰ and − 2.6 ± 0.5‰ applying Arens and Gröcke equations, respectively, and they are in agreement with the global Permian δ13Cair (−5.6 to −2.3‰).

Item Type:	Article
Uncontrolled Keywords:	Maceral; Coal facies; Carbon and nitrogen isotope; Palaeoclimate; Mahanadi valley
Subjects:	Methane Emission and Degasification
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	11 Sep 2025 04:48
Last Modified:	11 Sep 2025 04:48
URI:	http://cimfr.csircentral.net/id/eprint/2872

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