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Article: Oxidative elemental cycling under the low O2 Eoarchean atmosphere

TitleOxidative elemental cycling under the low O2 Eoarchean atmosphere
Authors
Issue Date2016
Citation
Scientific Reports, 2016, v. 6, article no. 21058, p. 1-9 How to Cite?
AbstractThe Great Oxidation Event signals the first large-scale oxygenation of the atmosphere roughly 2.4 Gyr ago. Geochemical signals diagnostic of oxidative weathering, however, extend as far back as 3.3-2.9 Gyr ago. 3.8-3.7 Gyr old rocks from Isua, Greenland stand as a deep time outpost, recording information on Earth's earliest surface chemistry and the low oxygen primordial biosphere. Here we find fractionated Cr isotopes, relative to the igneous silicate Earth reservoir, in metamorphosed banded iron formations (BIFs) from Isua that indicate oxidative Cr cycling 3.8-3.7 Gyr ago. Elevated U/Th ratios in these BIFs relative to the contemporary crust, also signal oxidative mobilization of U. We suggest that reactive oxygen species were present in the Eoarchean surface environment, under a very low oxygen atmosphere, inducing oxidative elemental cycling during the deposition of the Isua BIFs and possibly supporting early aerobic biology.
Persistent Identifierhttp://hdl.handle.net/10722/269738
ISSN
2017 Impact Factor: 4.122
2015 SCImago Journal Rankings: 2.073

 

DC FieldValueLanguage
dc.contributor.authorFrei, Robert-
dc.contributor.authorCrowe, Sean A.-
dc.contributor.authorBau, Michael-
dc.contributor.authorPolat, Ali-
dc.contributor.authorFowle, David A.-
dc.contributor.authorDøssing, Lasse N.-
dc.date.accessioned2019-04-30T01:49:27Z-
dc.date.available2019-04-30T01:49:27Z-
dc.date.issued2016-
dc.identifier.citationScientific Reports, 2016, v. 6, article no. 21058, p. 1-9-
dc.identifier.issn2045-2322-
dc.identifier.urihttp://hdl.handle.net/10722/269738-
dc.description.abstractThe Great Oxidation Event signals the first large-scale oxygenation of the atmosphere roughly 2.4 Gyr ago. Geochemical signals diagnostic of oxidative weathering, however, extend as far back as 3.3-2.9 Gyr ago. 3.8-3.7 Gyr old rocks from Isua, Greenland stand as a deep time outpost, recording information on Earth's earliest surface chemistry and the low oxygen primordial biosphere. Here we find fractionated Cr isotopes, relative to the igneous silicate Earth reservoir, in metamorphosed banded iron formations (BIFs) from Isua that indicate oxidative Cr cycling 3.8-3.7 Gyr ago. Elevated U/Th ratios in these BIFs relative to the contemporary crust, also signal oxidative mobilization of U. We suggest that reactive oxygen species were present in the Eoarchean surface environment, under a very low oxygen atmosphere, inducing oxidative elemental cycling during the deposition of the Isua BIFs and possibly supporting early aerobic biology.-
dc.languageeng-
dc.relation.ispartofScientific Reports-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleOxidative elemental cycling under the low O2 Eoarchean atmosphere-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/srep21058-
dc.identifier.scopuseid_2-s2.0-84958568005-
dc.identifier.volume6-
dc.identifier.spagearticle no. 21058, p. 1-
dc.identifier.epagearticle no. 21058, p. 9-

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