Iron isotope fractionation and the oxygen fugacity of the mantle

Williams, Helen M. and McCammon, Catherine A. and Peslier, Anne H. and Halliday, Alex N. and Teutsch, Nadya and Levasseur, Sylvain and Burg, Jean-Pierre (2004) Iron isotope fractionation and the oxygen fugacity of the mantle. Science, 304 (5677). pp. 1656-1659. ISSN 0036-8075 (print), 1095-9203 (online) DOI 10.1126/science.1095679

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Abstract

The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+/Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/ΣFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.

Item Type: Article
Uncontrolled Keywords: NILAREP
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title: Science
Volume: 304
Page Range: pp. 1656-1659
Identification Number: 10.1126/science.1095679
Depositing User: Sarah Humbert
Date Deposited: 20 Jul 2016 12:32
Last Modified: 20 Jul 2016 12:32
URI: http://eprints.esc.cam.ac.uk/id/eprint/3699

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