The relationship between subduction zone redox budget and arc magma fertility

Katy Evans, Andrew Tomkins

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    Abstract

    A number of lines of evidence point to a causal link between oxidised slab-derived fluids, oxidised sub-arc mantle, and the formation of economic concentrations of metals such as Cu and Au that require oxidised magmas. However, trace element evidence from some trace element and isotope data suggests that sub-arc mantle is no more oxidised than mantle elsewhere. A simple analytical model is applied to constrain the evolution of sub-arc mantle oxidation state as a function of redox-budget fluxes from the subducting slab. Influential variables include the solubility of Fe(3+) and SO(4)(2-) in slab-derived fluids, the geometry of the infiltration of slab-derived fluids in sub-arc mantle, the coupling between slab-derived and arc-output redox budgets, and the concentration of redox-buffering elements such as Fe and S in the sub-arc mantle.
    Original languageEnglish
    Pages (from-to)401 - 409
    Number of pages9
    JournalEarth and Planetary Science Letters
    Volume308
    Issue number3-4
    DOIs
    Publication statusPublished - 2011

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