Episodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinction
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Summons_Episodic photic zone.pdf
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Author(s)
Kasprak, A. H.
Price-Waldman, R.
Williford, K. H.
Schoepfer, S. D.
Haggart, J. W.
Ward, P. D.
Whiteside, J. H.
Sepulveda, Julio C
Summons, Roger E
Date Issued
February 2015
Journal
Geology
Publisher
Geological Society of America
Citation
Kasprak, A. H. et al. “Episodic Photic Zone Euxinia in the Northeastern Panthalassic Ocean during the End-Triassic Extinction.” Geology 43.4 (2015): 307–310.
Version
Author's final manuscript
Abstract
Severe changes in ocean redox, nutrient cycling, and marine productivity accompanied most Phanerozoic mass extinctions. However, evidence for marine photic zone euxinia (PZE) as a globally important extinction mechanism for the end-Triassic extinction (ETE) is currently lacking. Fossil molecular (biomarker) and nitrogen isotopic records from a sedimentary sequence in western Canada provide the first conclusive evidence of PZE and disrupted biogeochemistry in neritic waters of the Panthalassic Ocean during the end Triassic. Increasing water-column stratification and deoxygenation across the ETE led to PZE in the Early Jurassic, paralleled by a perturbed nitrogen cycle and ecological turnovers among noncalcifying groups, including eukaryotic algae and prokaryotic plankton. If such conditions developed widely in the Panthalassic Ocean, PZE might have been a potent mechanism for the ETE.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1130/g36371.1
