Proterozoic ocean redox and biogeochemical stasis

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dc.contributor.authorReinhard, Christopher T.en
dc.contributor.authorPlanavsky, Noah J.en
dc.contributor.authorRobbins, Leslie J.en
dc.contributor.authorPartin, Camille A.en
dc.contributor.authorGill, Benjamin C.en
dc.contributor.authorLalonde, Stefan V.en
dc.contributor.authorBekker, Andreyen
dc.contributor.authorKonhauser, Kurt O.en
dc.contributor.authorLyons, Timothy W.en
dc.date.accessioned2023-01-04T20:04:14Zen
dc.date.available2023-01-04T20:04:14Zen
dc.date.issued2013en
dc.date.updated2023-01-04T04:03:39Zen
dc.description.abstractThe partial pressure of oxygen in Earth's atmosphere has increased dramatically through time, and this increase is thought to have occurred in two rapid steps at both ends of the Proterozoic Eon (~2.5-0.543 Ga). However, the trajectory and mechanisms of Earth's oxygenation are still poorly constrained, and little is known regarding attendant changes in ocean ventilation and seafloor redox.We have a particularly poor understanding of ocean chemistry during the mid-Proterozoic (~1.8-0.8 Ga). Given the coupling between redoxsensitive trace element cycles and planktonic productivity, various models for mid-Proterozoic ocean chemistry imply different effects on the biogeochemical cycling of major and trace nutrients, with potential ecological constraints on emerging eukaryotic life. Here, we exploit the differing redox behavior of molybdenum and chromium to provide constraints on seafloor redox evolution by coupling a large database of sedimentary metal enrichments to a mass balance model that includes spatially variant metal burial rates.We find that the metal enrichment record implies a Proterozoic deep ocean characterized by pervasive anoxia relative to the Phanerozoic (at least ~30-40% of modern seafloor area) but a relatively small extent of euxinic (anoxic and sulfidic) seafloor (less than ~1-10% of modern seafloor area). Our model suggests that the oceanicMo reservoir is extremely sensitive to perturbations in the extent of sulfidic seafloor and that the record of Mo and chromium enrichments through time is consistent with the possibility of a Mo-N colimited marine biosphere during many periods of Earth's history.en
dc.description.versionPublished versionen
dc.format.extentPages 5357-5362en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1073/pnas.1208622110en
dc.identifier.eissn1091-6490en
dc.identifier.issn0027-8424en
dc.identifier.issue14en
dc.identifier.orcidGill, Benjamin [0000-0001-7402-0811]en
dc.identifier.other1208622110 (PII)en
dc.identifier.pmid23515332en
dc.identifier.urihttp://hdl.handle.net/10919/113034en
dc.identifier.volume110en
dc.language.isoenen
dc.publisherNational Academy of Sciencesen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000318037800036&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectpaleoceanographyen
dc.subjectgeobiologyen
dc.subjectFERRUGINOUS CONDITIONSen
dc.subjectCHROMATE REDUCTIONen
dc.subjectMOLYBDENUMen
dc.subjectNITROGENen
dc.subjectWATERen
dc.subjectLIMITATIONen
dc.subjectANOXIAen
dc.subjectCARBONen
dc.subjectOXYGENen
dc.subjectCOEVOLUTIONen
dc.subject14 Life Below Wateren
dc.subject.meshPlanktonen
dc.subject.meshOxygenen
dc.subject.meshMetalsen
dc.subject.meshAtmosphereen
dc.subject.meshOxidation-Reductionen
dc.subject.meshOceanographyen
dc.subject.meshGeologic Sedimentsen
dc.subject.meshModels, Theoreticalen
dc.subject.meshHistory, Ancienten
dc.subject.meshComputer Simulationen
dc.subject.meshOceans and Seasen
dc.titleProterozoic ocean redox and biogeochemical stasisen
dc.title.serialProceedings of the National Academy of Sciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJOURen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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