Sephton, Mark A.; Amor, Ken; Franchi, Ian A.; Wignall, Paul B.; Newton, Robert and Zonneveld, John-Paul
(2002).
| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1130/0091-7613(2002)030%3C1119:CANIDA%3E2.0.CO;2 |
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| Google Scholar: | Look up in Google Scholar |
Abstract
Major perturbations of organic carbon and nitrogen isotope ratios from a Norian-Rhaetian (Late Triassic) boundary section in British Columbia coincide with an extinction of the dominant, deep-water invertebrate fauna of the Late Triassic (monotids and most ammonoids). The carbon isotope excursion is attributed to the development of widespread oceanic stagnation that favored organic-rich shale deposition. The coincident nitrogen isotope excursion suggests that progressively more nitrate-limited productivity forced a change to nitrogen-fixing cyanobacteria populations as ocean stagnation created nutrient-starved conditions. The biotic crisis and geochemical events of the Norian-Rhaetian boundary predate the latest Rhaetian (end-Triassic) mass extinction. Thus, the Late Triassic interval was marked by more than one extinction event.
| Item Type: | Journal Article |
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| ISSN: | 0091-7613 |
| Keywords: | Triassic; Norian; Rhaetian; extinction; carbon; nitrogen; isotopes; anoxia |
| Academic Unit/Department: | Science > Environment, Earth and Ecosystems Science > Physical Sciences |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 4943 |
| Depositing User: | Users 6044 not found. |
| Date Deposited: | 17 Jul 2006 |
| Last Modified: | 02 Dec 2010 19:52 |
| URI: | http://oro.open.ac.uk/id/eprint/4943 |
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