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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Bénard A,Klimm K,Woodland AB,Arculus RJ,Wilke M,Botcharnikov RE,Shimizu N,Nebel O,Rivard C,Ionov DAdoi
10.1038/s41467-018-05804-2subject
Has Abstractpub_date
2018-08-29 00:00:00pages
3500issue
1issn
2041-1723pii
10.1038/s41467-018-05804-2journal_volume
9pub_type
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