Significance of polycyclic aromatic hydrocarbons (PAHs) in Permian/Triassic boundary sections |
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| Authors: | Birgit Nabbefeld Kliti Grice Roger E Summons Lindsay E Hays Changqun Cao |
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| Institution: | 1. WA Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987 Perth, WA 6845, Australia;2. Massachusetts Institute of Technology, Earth and Planetary Sciences, 77 Massachusetts Ave. E34-246, Cambridge MA 02139-4307, USA;3. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, China |
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| Abstract: | In this study the abundances of several polycyclic aromatic hydrocarbons (PAHs Table 1, I–XXI) have been measured throughout three Permian/Triassic (P/Tr) sections from Meishan (South China), Kap Stosch area (East Greenland) and Peace River Basin (Western Canada). Dibenzothiophene (I) and dibenzofuran (II) were found to decrease in abundance just before or shortly after the P/Tr transition in all three sections while perylene (III) was observed to increase in abundance at the onset of the main extinction horizon (bed 25) in Meishan. Perylene has been attributed to a wood degrading fungal source and, therefore, it seems possible these phenomena are related to the demise of land plants. Further, distinct patterns of various combustion-derived PAHs occurring in each section imply that forest fire events occurred within the Late Permian and Early Triassic. In the Meishan section high amounts of combustion-derived PAHs pyrene (IV), fluoranthene (V), benzoa]anthracene (VI), benzofluoranthenes (sum, i.e. VII), benzoa]pyrene (VIII), benzoe]pyrene (IX) and coronene (X)] occur within bed 25, also containing ash attributed to the fallout from massive volcanic eruptions in Siberia and/or China. |
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