Archaean chromitites show constant Fe 3+ /ΣFe in Earth's asthenospheric mantle since 3.8 Ga
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Rollinson Mantle oxidation ...
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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, 282-283:316Publisher
ElsevierJournal
LithosDOI
10.1016/j.lithos.2017.03.020Additional Links
http://linkinghub.elsevier.com/retrieve/pii/S0024493717301263Type
ArticleLanguage
enISSN
244937ae974a485f413a2113503eed53cd6c53
10.1016/j.lithos.2017.03.020