Molecular stable carbon isotope compositions of alkylphenanthrenes in coals and marine shales related to source and maturity |
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Authors: | Matthias Radke,Andreas Hilkert,Jü rgen Rullkö tter |
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Affiliation: | aInstitute of Petroleum and Organic Geochemistry (ICG-4), Research Centre Jülich, D-52425 Jülich, Germany;bFinnigan MAT, Barkhausenstraße 2, D-28197 Bremen, Germany;cInstitute of Chemistry und Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, P.O. Box 2503, D-26111 Oldenburg, Germany |
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Abstract: | Phenanthrene (PHE) and methylphenanthrenes (MPs) extracted from coaly shale and coal samples containing terrestrial organic matter are compared with the same compounds from marine shales in terms of yields and δ13C values at marginally to fully mature stages of thermal evolution. The shales derived from four boreholes in the Hils Half-Graben area, northwestern Germany, were shown to be representative of a greater number of samples from the same sites. The δ13C values of extractable PHE and MPs are less negative in the terrestrial (−24.3 to −26.0‰) than in the marine (−28.8 to −30.5‰) samples. Since these values are unrelated to mean vitrinite reflectance (Rr) values in the range of 0.5–0.9%, it appears that the stable carbon isotope composition of PHE and MPs is controlled by organic matter type rather than maturity. |
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Keywords: | carbon isotopes GC-IR-MS phenanthrene methylphenanthrenes retene simonellite maturity effects |
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