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|Title:||Major perturbation in sulfur cycling at the Triassic-Jurassic boundary|
|Citation:||Geology, 2009; 37(9):835-838|
|Publisher:||Geological Society of America|
|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|
|Appears in Collections:||Earth and Environmental Sciences publications|
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