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
| Authors | Rollinson, 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. |
| Keywords | Archaean; Chromite; Mantle redox; Geology |
| Year | 2017 |
| Journal | Lithos |
| Journal citation | 282-283, pp. 316-325 |
| Publisher | Elsevier |
| ISSN | 0024-4937 |
| 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 status | Published |
| Publication dates | 29 Mar 2017 |
| Publication process dates | |
| Deposited | 13 Apr 2017, 14:56 |
| Accepted | 23 Mar 2017 |
| Rights | Archived with thanks to Lithos |
| Contributors | University of Derby, University of Trieste and Geological Survey of Denmark and Greenland |
| File | License File Access Level Open |
| File | File Access Level Restricted |
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