Archaean chromitites show constant Fe3+/ΣFe in Earth's asthenospheric mantle since 3.8 Ga

Hugh Rollinson, Jacob Adetunji, Davide Lenaz, Kristoffer Szilas

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

20 Citationer (Scopus)

Abstrakt

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 Fe 3 +/(Fe 3 + + Fe 2 +) in the mineral chromite hosted in mantle-derived melts to show that there is no change in mantle Fe 3 +/(Fe 3 + + Fe 2 +) 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.

OriginalsprogEngelsk
Sider (fra-til)316-325
Antal sider10
TidsskriftLithos
Vol/bind282-283
DOI
StatusUdgivet - 1 jun. 2017

Programområde

  • Programområde 5: Natur og klima

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