The redox state of arc mantle using Zn/Fe systematics

Cin-Ty A. Lee (), Peter Luffi, Véronique Le Roux, Rajdeep Dasgupta, Francis Albaréde and William P. Leeman
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Cin-Ty A. Lee: Rice University
Peter Luffi: Rice University
Véronique Le Roux: Rice University
Rajdeep Dasgupta: Rice University
Francis Albaréde: Rice University
William P. Leeman: Rice University

Nature, 2010, vol. 468, issue 7324, 681-685

Abstract: The redox state of arc mantle The redox state of the upper mantle beneath arcs is relevant to understanding mantle melting and melt differentiation. Because we have no access to samples from the convective mantle, this question has to be addressed indirectly using information derived from the chemistry of melts. Cin-Ty Lee et al. show that the ratio of zinc to total iron content constrains the valence state of iron in primary arc basalts and their mantle sources. They find that primitive arc magmas have Zn/Fe ratios identical to those of mid-ocean ridge basalts, hinting at a similar iron oxidation state of primary mantle melts in arcs and ridges. The results suggest that the subduction of oxidized crustal material may not significantly alter the redox state of the mantle wedge. They conclude that the observed higher oxidation states of arc lavas must therefore be, in part, a consequence of shallow-level differentiation processes.

Date: 2010
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DOI: 10.1038/nature09617

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