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Global ocean redox changes before and during the Toarcian Oceanic Anoxic Event

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dc.contributor.authorKunert, Alexandra
dc.contributor.authorKendall, Brian
dc.date.accessioned2023-10-30T13:30:48Z
dc.date.available2023-10-30T13:30:48Z
dc.date.issued2023-02-13
dc.descriptionThis article is published by Springer Nature and is available here: https://doi.org/10.1038/s41467-023-36516-x This article is published Open Access and made available through a Creative Commons Attribution 4.0 International license: https://creativecommons.org/licenses/by/4.0/en
dc.description.abstractMesozoic oceanic anoxic events are recognized as widespread deposits of marine organic-rich mudrocks temporally associated with mass extinctions and large igneous province emplacement. The Toarcian Oceanic Anoxic Event is one example during which expanded ocean anoxia is hypothesized in response to environmental perturbations associated with emplacement of the Karoo–Ferrar igneous province. However, the global extent of total seafloor anoxia and the relative extent of euxinic (anoxic and sulfide-rich) and noneuxinic anoxic conditions during the Toarcian Oceanic Anoxic Event are poorly constrained. Here we present estimates of the global total anoxic and euxinic seafloor areas before and during the Toarcian Oceanic Anoxic Event based on rhenium and molybdenum enrichments, respectively, in organic-rich mudrocks of the Fernie Formation (British Columbia, Canada). We find that mass balance models depict an expansion of up to ~7% total seafloor anoxia, which was dominated by euxinia, at the onset of the Toarcian Oceanic Anoxic Event, followed by a contraction before the end of the event. The global ocean redox trends revealed by the rhenium data mirrors the collapse and recovery patterns of global ammonite and foraminiferal biodiversity.en
dc.identifier.urihttps://doi.org/10.1038/s41467-023-36516-x
dc.identifier.urihttp://hdl.handle.net/10012/20072
dc.language.isoenen
dc.publisherSpringer Natureen
dc.relation.ispartofseriesNature Communications;14; 815
dc.titleGlobal ocean redox changes before and during the Toarcian Oceanic Anoxic Eventen
dc.typeArticleen
dcterms.bibliographicCitationKunert, A., & Kendall, B. (2023). Global Ocean redox changes before and during the Toarcian Oceanic anoxic event. Nature Communications, 14(1). https://doi.org/10.1038/s41467-023-36516-xen
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.typeOfResourceTexten

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