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The redox state of arc mantle using Zn/Fe systematics

Author

Listed:
  • Cin-Ty A. Lee

    (Rice University)

  • Peter Luffi

    (Rice University)

  • Véronique Le Roux

    (Rice University)

  • Rajdeep Dasgupta

    (Rice University)

  • Francis Albaréde

    (Rice University
    Ecole Normale Supérieure de Lyon, Universite Claude Bernard-Lyon I and CNRS)

  • William P. Leeman

    (Rice University
    National Science Foundation)

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.

Suggested Citation

  • Cin-Ty A. Lee & Peter Luffi & Véronique Le Roux & Rajdeep Dasgupta & Francis Albaréde & William P. Leeman, 2010. "The redox state of arc mantle using Zn/Fe systematics," Nature, Nature, vol. 468(7324), pages 681-685, December.
    • Handle: RePEc:nat:nature:v:468:y:2010:i:7324:d:10.1038_nature09617
    DOI: 10.1038/nature09617
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    Cited by:

    1. Fangyang Hu & Hehe Jiang & Bo Wan & Mihai N. Ducea & Lei Gao & Fu-Yuan Wu, 2024. "Latitude-dependent oxygen fugacity in arc magmas," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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