@misc{BenardKlimmWoodlandetal.2018,
  author    = {B{\´e}nard, Antoine and Klimm, Kevin and Woodland, Alan B. and Arculus, Richard J. and Wilke, Max and Botcharnikov, Roman E. and Shimizu, Nobumichi and Nebel, Oliver and Rivard, Camille and Ionov, Dmitri A.},
  title     = {Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas},
  series = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  number    = {717},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-42618},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-426184},
  pages     = {10},
  year      = {2018},
  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 per mille), 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.},
  language  = {en}
}