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Fully oxygenated water columns over continental shelves before the Great Oxidation Event

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dc.contributor.authorOstrander, Chadlin
dc.contributor.authorNielsen, Sune
dc.contributor.authorOwens, Jeremy
dc.contributor.authorKendall, Brian
dc.contributor.authorGordon, Gwyneth
dc.contributor.authorRomaniello, Stephen
dc.contributor.authorAnbar, Ariel
dc.date.accessioned2020-07-02T16:05:01Z
dc.date.available2020-07-02T16:05:01Z
dc.date.issued2019-02-25
dc.description.abstractLate Archaean sedimentary rocks contain compelling geochemical evidence for episodic accumulation of dissolved oxygen in the oceans along continental margins before the Great Oxidation Event. However, the extent of this oxygenation remains poorly constrained. Here we present thallium and molybdenum isotope compositions for anoxic organic-rich shales of the 2.5-billion-year-old Mount McRae Shale from Western Australia, which previously yielded geochemical evidence of a transient oxygenation event. During this event, we observe an anticorrelation between thalium and molybdenum isotope data, including two shifts to higher molybdenum and lower thalium isotope compositions. Our data indicate pronounced burial of manganese oxides in sediments elsewhere in the ocean at these times, which requires that the water columns above portions of the ocean floor were fully oxygenated—all the way from the air–sea interface to well below the sediment–water interface. Well-oxygenated continental shelves were probably the most important sites of manganese oxide burial and mass-balance modelling results suggest that fully oxygenated water columns were at least a regional-scale feature of early Earth’s oceans 2.5 billion years ago.en
dc.description.sponsorshipNSERC Discovery Grant award RGPIN-435930en
dc.identifier.urihttp://hdl.handle.net/10012/16021
dc.language.isoenen
dc.publisherNatureen
dc.titleFully oxygenated water columns over continental shelves before the Great Oxidation Eventen
dc.typeArticleen
dcterms.bibliographicCitationOstrander C.M., Nielsen S.G., Owens J.D., Kendall B., Gordon G.W., Romaniello S.J., Anbar A.D., 2019. Fully oxygenated water columns over continental shelves before the Great Oxidation Event. Nature Geoscience, v. 12, p. 186-191.en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.typeOfResourceTexten

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