Iron isotope fractionation and the oxygen fugacity of the mantle

Helen M. Williams, Catherine A. McCammon, Anne H. Peslier, Alex N. Halliday, Nadya Teutsch, Sylvain Levasseur, Jean Pierre Burg

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1656-1659
Number of pages4
Issue number5677
StatePublished - 11 Jun 2004
Externally publishedYes

ASJC Scopus subject areas

  • General


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