Journal
SCIENCE
Volume 304, Issue 5677, Pages 1656-1659Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1095679
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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 (delta(57/54)Fe) of mantle spinels. Spinel delta(57/54)Fe values correlate with relative oxygen fugacity, Fe3+/SigmaFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.
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