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https://hdl.handle.net/2440/87463
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Type: | Journal article |
Title: | Major perturbation in sulfur cycling at the Triassic-Jurassic boundary |
Author: | Williford, K. Foriel, J. Ward, P. Steig, E. |
Citation: | Geology (Boulder), 2009; 37(9):835-838 |
Publisher: | Geological Society of America |
Issue Date: | 2009 |
ISSN: | 0091-7613 1943-2682 |
Statement of Responsibility: | Kenneth H. Williford, Julien Foriel, Peter D. Ward, and Eric J. Steig |
Abstract: | Stable sulfur isotopes from the reduced sulfur fraction of Late Triassic–Early Jurassic marine sediments at Kennecott Point in British Columbia, Canada, show evidence for a major perturbation in sulfur cycling coincident with a major carbon cycle perturbation in the wake of a mass extinction event at the Triassic-Jurassic boundary. The δ34S of reduced sulfur shifts from values consistent with open system bacterial sulfate reduction (−30‰) to values higher than any previously reported for Early Jurassic sulfates (20‰) and consistent with complete utilization of sulfate and Rayleigh fractionation in a closed system. We suggest that this isotopic shift was initiated by declining seawater sulfate concentration due to evaporite deposition in nascent Atlantic rift zones and enhanced by a local mechanism, such as a decoupling of the zone of sulfate reduction from the sulfate supply due to a catastrophic increase in the flux of land-derived sediments reaching the sea in the wake of massive terrestrial plant die-off during the Triassic–Jurassic mass extinction. |
Rights: | © 2009 Geological Society of Australia |
DOI: | 10.1130/G30054A.1 |
Published version: | http://dx.doi.org/10.1130/g30054a.1 |
Appears in Collections: | Aurora harvest 7 Earth and Environmental Sciences publications |
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