Intrabasin variability of the carbon-isotope record across the Permian–Triassic transition, Sverdrup Basin, Arctic Canada |
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| Authors: | Stephen E Grasby Benoit Beauchamp |
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| Institution: | aGeological Survey of Canada – Calgary, 3303 33rd St. N.W., Calgary Alberta Canada T2L 2A7;bArctic Institute of North America, University of Calgary, 2500 University Dr. N.W. Calgary Alberta Canada T2N 1N4 |
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| Abstract: | A major late Paleozoic depocentre, the Sverdrup Basin, Canadian High Arctic, has been largely left out of the latest Permian extinction debate, as early workers presumed Middle to Late Permian strata were absent. Basin-scale sequence-stratigraphic and chemostratigraphic correlations indicate Late Permian strata are only missing on the basin margins, where they were removed by sub-Triassic erosion, whereas continuous deposition is recorded in the basin centre. The varying degree of sub-Triassic erosion has significant impact on the carbon-isotope record across the Latest Permian Extinction event, where both the apparent rate and magnitude of carbon-isotope shift vary as a function of basin position. The intrabasin variability in apparent δ13Corg shift across the event is equivalent to that observed globally. In contrast to the abrupt isotope shifts recorded on the basin margin, similar to many records reported globally, the basin centre section shows a systematic shift associated with the Latest Permian Extinction. The Earth likely underwent a prolonged period of increasing environmental stress leading up to the event. |
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| Keywords: | Carbon isotopes Sverdrup Basin P– T boundary Latest Permian Extinction |
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