Journal
SCIENCE ADVANCES
Volume 6, Issue 37, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abb6704
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Funding
- Leverhulme Early Career Fellowship [ECF-2015-044]
- National Natural Science Foundation of China [41888101]
- NERC [NE/S009663/1, NE/N018559/1, NE/P013724/1]
- University of Leeds Academic Fellowship
- University of Palermo [PJ Autf 005550, R4D14-P5F5RISS_MARGINE]
- One Hundred Talent Program of China University of Geosciences (CUG) Wuhan, China
- NERC [NE/S009663/1, NE/N018559/1, NE/P013724/1] Funding Source: UKRI
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The role of ocean anoxia as a cause of the end-Triassic marine mass extinction is widely debated. Here, we present carbonate-associated sulfate delta S-34 data from sections spanning the Late Triassic-Early Jurassic transition, which document synchronous large positive excursions on a global scale occurring in similar to 50 thousand years. Biogeochemical modeling demonstrates that this S isotope perturbation is best explained by a fivefold increase in global pyrite burial, consistent with large-scale development of marine anoxia on the Panthalassa margin and northwest European shelf. This pyrite burial event coincides with the loss of Triassic taxa seen in the studied sections. Modeling results also indicate that the pre-event ocean sulfate concentration was low (<1 millimolar), a common feature of many Phanerozoic deoxygenation events. We propose that sulfate scarcity preconditions oceans for the development of anoxia during rapid warming events by increasing the benthic methane flux and the resulting bottom-water oxygen demand.
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