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Transient episodes of mild environmental oxygenation and oxidative continental weathering during the late Archean

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dc.contributor.authorKendall, Brian
dc.contributor.authorCreaser, Robert
dc.contributor.authorReinhard, Christopher T.
dc.contributor.authorLyons, Timothy W.
dc.contributor.authorAnbar, Ariel
dc.date.accessioned2017-07-14T17:53:21Z
dc.date.available2017-07-14T17:53:21Z
dc.date.issued2015-11-20
dc.description.abstractIt is not known whether environmental O2 levels increased in a linear fashion or fluctuated dynamically between the evolution of oxygenic photosynthesis and the later Great Oxidation Event. New rhenium-osmium isotope data from the late Archean Mount McRae Shale, Western Australia, reveal a transient episode of oxidative continental weathering more than 50 million years before the onset of the Great Oxidation Event. A depositional age of 2495 ± 14 million years and an initial (187)Os/(188)Os of 0.34 ± 0.19 were obtained for rhenium- and molybdenum-rich black shales. The initial (187)Os/(188)Os is higher than the mantle/extraterrestrial value of 0.11, pointing to mild environmental oxygenation and oxidative mobilization of rhenium, molybdenum, and radiogenic osmium from the upper continental crust and to contemporaneous transport of these metals to seawater. By contrast, stratigraphically overlying black shales are rhenium- and molybdenum-poor and have a mantle-like initial (187)Os/(188)Os of 0.06 ± 0.09, indicating a reduced continental flux of rhenium, molybdenum, and osmium to seawater because of a drop in environmental O2 levels. Transient oxygenation events, like the one captured by the Mount McRae Shale, probably separated intervals of less oxygenated conditions during the late Archean.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada U.S. National Science Foundation (Frontiers in Earth System Dynamicsen
dc.identifier.urihttps://doi.org/10.1126/sciadv.1500777
dc.identifier.urihttp://hdl.handle.net/10012/12069
dc.language.isoenen
dc.publisherAmerican Association for the Advancement of Scienceen
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectEarth sciencesen
dc.subjectArcheanen
dc.subjectOxidative continental weatheringen
dc.subjectAtmospheric oxygenen
dc.subjectGeochronologyen
dc.subjectRheniumen
dc.subjectOsmiumen
dc.subjectMolybdenumen
dc.subjectMount McRaeen
dc.subjectShaleen
dc.subjectHamersley Basinen
dc.titleTransient episodes of mild environmental oxygenation and oxidative continental weathering during the late Archeanen
dc.typeArticleen
dcterms.bibliographicCitationKendall, B., Creaser, R. A., Reinhard, C. T., Lyons, T. W., & Anbar, A. D. (2015). Transient episodes of mild environmental oxygenation and oxidative continental weathering during the late Archean. Science Advances, 1(10), e1500777–e1500777. https://doi.org/10.1126/sciadv.1500777en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.typeOfResourceTexten

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