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    Archaean chromitites show constant Fe 3+ /ΣFe in Earth's asthenospheric mantle since 3.8 Ga

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    Name:
    Rollinson Mantle oxidation ...
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    Authors
    Rollinson, Hugh cc
    Adetunji, Jacob cc
    Lenaz, Davide
    Szilas, Kristoffer cc
    Affiliation
    University of Derby
    University of Trieste
    Geological Survey of Denmark and Greenland
    Issue Date
    2017-03-29
    
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    Abstract
    Theoretical and planetary studies show that the Earth’s upper mantle is more oxidised than it should be. The mechanism by which this took place and the timing of the oxidation is contested. Here we present new Mössbauer spectroscopy measurements of the ionic ratio Fe3+/(Fe3++Fe2+) in the mineral chromite hosted in mantle-derived melts to show that there is no change in mantle Fe3+/(Fe3++Fe2+) ratio before and after the oxidation of the Earth’s atmosphere at ca. 2.4 Ga and over Earth history from 3.8 Ga to 95 Ma. Our finding supports the view that the oxidation of the asthenospheric mantle was very early and that the oxygenation of the Earth’s atmosphere was not directly coupled to mantle processes.
    Citation
    Rollinson, H. et al (2017) 'Archaean chromitites show constant Fe 3+ /ΣFe in Earth's asthenospheric mantle since 3.8 Ga', Lithos, 282-283:316
    Publisher
    Elsevier
    Journal
    Lithos
    URI
    http://hdl.handle.net/10545/621549
    DOI
    10.1016/j.lithos.2017.03.020
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0024493717301263
    Type
    Article
    Language
    en
    ISSN
    244937
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.lithos.2017.03.020
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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