Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas

Antoine Bénard (), Kevin Klimm (), Alan B. Woodland, Richard J. Arculus, Max Wilke, Roman E. Botcharnikov, Nobumichi Shimizu, Oliver Nebel, Camille Rivard and Dmitri A. Ionov
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Antoine Bénard: The Australian National University
Kevin Klimm: Goethe Universität Frankfurt
Alan B. Woodland: Goethe Universität Frankfurt
Richard J. Arculus: The Australian National University
Max Wilke: Universität Potsdam
Roman E. Botcharnikov: Leibniz Universität Hannover
Nobumichi Shimizu: Woods Hole Oceanographic Institution
Oliver Nebel: Monash University
Camille Rivard: European Synchrotron Radiation Facility
Dmitri A. Ionov: Université de Montpellier and UMR-CNRS 5243

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Subduction zone magmas are more oxidised on eruption than those at mid-ocean ridges. This is attributed either to oxidising components, derived from subducted lithosphere (slab) and added to the mantle wedge, or to oxidation processes occurring during magma ascent via differentiation. Here we provide direct evidence for contributions of oxidising slab agents to melts trapped in the sub-arc mantle. Measurements of sulfur (S) valence state in sub-arc mantle peridotites identify sulfate, both as crystalline anhydrite (CaSO4) and dissolved SO42− in spinel-hosted glass (formerly melt) inclusions. Copper-rich sulfide precipitates in the inclusions and increased Fe3+/∑Fe in spinel record a S6+–Fe2+ redox coupling during melt percolation through the sub-arc mantle. Sulfate-rich glass inclusions exhibit high U/Th, Pb/Ce, Sr/Nd and δ34S (+ 7 to + 11‰), indicating the involvement of dehydration products of serpentinised slab rocks in their parental melt sources. These observations provide a link between liberated slab components and oxidised arc magmas.

Date: 2018
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DOI: 10.1038/s41467-018-05804-2

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