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

Journal article

Rollinson, Hugh, Adetunji, Jacob, Lenaz, Davide and Szilas, Kristoffer 2017. Archaean chromitites show constant Fe 3+ /ΣFe in Earth's asthenospheric mantle since 3.8 Ga. Lithos. 282-283, pp. 316-325. https://doi.org/10.1016/j.lithos.2017.03.020
AuthorsRollinson, Hugh, Adetunji, Jacob, Lenaz, Davide and Szilas, Kristoffer
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.

KeywordsArchaean; Chromite; Mantle redox; Geology
Year2017
JournalLithos
Journal citation282-283, pp. 316-325
PublisherElsevier
ISSN0024-4937
Digital Object Identifier (DOI)https://doi.org/10.1016/j.lithos.2017.03.020
Web address (URL)http://linkinghub.elsevier.com/retrieve/pii/S0024493717301263
hdl:10545/621549
Output statusPublished
Publication dates29 Mar 2017
Publication process dates
Deposited13 Apr 2017, 14:56
Accepted23 Mar 2017
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ContributorsUniversity of Derby, University of Trieste and Geological Survey of Denmark and Greenland
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