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Article: Two-step rise of atmospheric oxygen linked to the growth of continents

TitleTwo-step rise of atmospheric oxygen linked to the growth of continents
Authors
Issue Date2016
Citation
Nature Geoscience, 2016, v. 9, n. 6, p. 417-424 How to Cite?
Abstract© 2016 Macmillan Publishers Limited.Earth owes its oxygenated atmosphere to its unique claim on life, but how the atmosphere evolved from an initially oxygen-free state remains unresolved. The rise of atmospheric oxygen occurred in two stages: approximately 2.5 to 2.0 billion years ago during the Great Oxidation Event and roughly 2 billion years later during the Neoproterozoic Oxygenation Event. We propose that the formation of continents about 2.7 to 2.5 billion years ago, perhaps due to the initiation of plate tectonics, may have led to oxygenation by the following mechanisms. In the first stage, the change in composition of Earth's crust from iron- and magnesium-rich mafic rocks to feldspar- and quartz-rich felsic rocks could have caused a decrease in the oxidative efficiency of the Earth's surface, allowing atmospheric O2 to rise. Over the next billion years, as carbon steadily accumulated on the continents, metamorphic and magmatic reactions within this growing continental carbon reservoir facilitated a gradual increase in the total long-term input of CO2 to the ocean-atmosphere system. Given that O2 is produced during organic carbon burial, the increased CO2 input may have triggered a second rise in O2. A two-step rise in atmospheric O2 may therefore be a natural consequence of plate tectonics, continent formation and the growth of a crustal carbon reservoir.
Persistent Identifierhttp://hdl.handle.net/10722/230631
ISSN
2015 Impact Factor: 12.508
2015 SCImago Journal Rankings: 7.297

 

DC FieldValueLanguage
dc.contributor.authorLee, Cin Ty A-
dc.contributor.authorYeung, Laurence Y.-
dc.contributor.authorMcKenzie, N. Ryan-
dc.contributor.authorYokoyama, Yusuke-
dc.contributor.authorOzaki, Kazumi-
dc.contributor.authorLenardic, Adrian-
dc.date.accessioned2016-09-01T06:06:25Z-
dc.date.available2016-09-01T06:06:25Z-
dc.date.issued2016-
dc.identifier.citationNature Geoscience, 2016, v. 9, n. 6, p. 417-424-
dc.identifier.issn1752-0894-
dc.identifier.urihttp://hdl.handle.net/10722/230631-
dc.description.abstract© 2016 Macmillan Publishers Limited.Earth owes its oxygenated atmosphere to its unique claim on life, but how the atmosphere evolved from an initially oxygen-free state remains unresolved. The rise of atmospheric oxygen occurred in two stages: approximately 2.5 to 2.0 billion years ago during the Great Oxidation Event and roughly 2 billion years later during the Neoproterozoic Oxygenation Event. We propose that the formation of continents about 2.7 to 2.5 billion years ago, perhaps due to the initiation of plate tectonics, may have led to oxygenation by the following mechanisms. In the first stage, the change in composition of Earth's crust from iron- and magnesium-rich mafic rocks to feldspar- and quartz-rich felsic rocks could have caused a decrease in the oxidative efficiency of the Earth's surface, allowing atmospheric O2 to rise. Over the next billion years, as carbon steadily accumulated on the continents, metamorphic and magmatic reactions within this growing continental carbon reservoir facilitated a gradual increase in the total long-term input of CO2 to the ocean-atmosphere system. Given that O2 is produced during organic carbon burial, the increased CO2 input may have triggered a second rise in O2. A two-step rise in atmospheric O2 may therefore be a natural consequence of plate tectonics, continent formation and the growth of a crustal carbon reservoir.-
dc.languageeng-
dc.relation.ispartofNature Geoscience-
dc.titleTwo-step rise of atmospheric oxygen linked to the growth of continents-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1038/ngeo2707-
dc.identifier.scopuseid_2-s2.0-84973345405-
dc.identifier.volume9-
dc.identifier.issue6-
dc.identifier.spage417-
dc.identifier.epage424-
dc.identifier.eissn1752-0908-

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