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Cu isotopes in marine black shales record the Great Oxidation Event

Chi Fru, Ernest, Rodríguez, Nathalie P., Partin, Camille A., Lalonde, Stefan V., Andersson, Per, Weiss, Dominik J., El Albani, Abderrazak, Rodushkin, Ilia and Konhauser, Kurt O. 2016. Cu isotopes in marine black shales record the Great Oxidation Event. Proceedings of the National Academy of Sciences of the United States of America 113 (18) , pp. 4941-4946. 10.1073/pnas.1523544113

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Redox-sensitive transition metals and their isotopes provide some of the best lines of evidence for reconstructing early Earth’s oxygenation history, including permanent atmospheric oxygenation following the Great Oxidation Event (GOE), ∼2.45−2.32 Ga. We show a shift from dominantly negative to permanently positive copper isotope compositions in black shales spanning ∼2.66−2.08 Ga. We interpret the transition in marine δ65Cu values as reflecting some combination of waning banded iron formation deposition (which removes heavy Cu) and increased oxidative delivery of Cu from continental sulfides (which supplies heavy Cu). Both processes are ultimately related to increased oxidative weathering and a progressive increase in sulfate and sulfide availability accompanying the GOE. Our results provide insights into copper cycling and bioavailability coupled to Earth’s oxygenation history.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: National Academy of Sciences
ISSN: 0027-8424
Funders: ERC
Date of First Compliant Deposit: 10 November 2016
Date of Acceptance: 10 March 2016
Last Modified: 12 Nov 2018 12:57

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