Anatomy of an intruded coal, II effect of contact metamorphism on organic δ13C and implications for the release of thermogenic methane, Springfield (No. 5) Coal, Illinois Basin.pdfVIP

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Anatomy of an intruded coal, II effect of contact metamorphism on organic δ13C and implications for the release of thermogenic methane, Springfield (No. 5) Coal, Illinois Basin.pdf

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Anatomy of an intruded coal, II effect of contact metamorphism on organic δ13C and implications for the release of thermogenic methane, Springfield (No. 5) Coal, Illinois Basin.pdf

International Journal of Coal Geology 158 (2016) 129–136 Contents lists available at ScienceDirect International Journal of Coal Geology journal homepage: /locate/ijcoalgeo Anatomy of an intruded coal, II: effect of contact metamorphism on organic δ13C and implications for the release of thermogenic methane, Spring?eld (No. 5) Coal, Illinois Basin Lois E. Yoksoulian a, Susan M. Rimmer b,?, Harold D. Rowe c a Department of Journalism, University of Illinois at Urbana-Champaign, Champaign, IL 61822, United States b Department of Geology, Southern Illinois University Carbondale, Carbondale, IL 62901, United States c Bureau of Economic Geology, University of Texas at Austin, Austin, TX 78713, United States article info Article history: Received 17 June 2015 Received in revised form 16 March 2016 Accepted 17 March 2016 Available online 19 March 2016 Keywords: Carbon isotopes Thermogenic methane Vitrinite re?ectance Intrusions Contact metamorphism abstract Concerns about the present-day accelerated rate of carbon input to the atmosphere have prompted the search for comparable events throughout Earths history. Recent research has attempted to determine the cause of such events, represented as negative δ13C excursions within the sedimentary record, and their subsequent effect on the Earth. It has been suggested that such excursions could be the result of the large-scale release of 13C- depleted thermogenic methane produced by the intrusion of large igneous provinces (LIPs) into organic-rich rocks and/or coal (e.g., McElwain et al., 2005; Svensen et al., 2004, 2007). Our study asserts that if intrusions result in signi?cant release of 13C-depleted thermogenic methane from intruded coals, 13C-enriched coal should be observed adjacent to the intrusions. In this study, values of bulk organic δ13C (δ13Corg) are reported for ?fteen samples along a coal transect in the Illinois Basin where a Pennsylvanian-age coal (the Spring?eld or No. 5 Coal) is intruded by a Permian ultrama?c d