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

Nature Communications
Antoine BénardDmitri A Ionov

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.

References

Aug 1, 2009·Science·Katherine A Kelley, Elizabeth Cottrell
Dec 3, 2010·Nature·Cin-Ty A LeeWilliam P Leeman
Feb 11, 2015·Scientific Reports·Takanori KagoshimaKeiko Hattori
Dec 17, 2016·Nature Communications·Marie-Laure PonsHelen Williams

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Citations

Apr 13, 2019·Proceedings of the National Academy of Sciences of the United States of America·Daniel A Stolper, Claire E Bucholz
Dec 22, 2019·Scientific Reports·F PiccoliJ F Vieira Duarte
Aug 3, 2019·Nature Geoscience·Peter Tollan, Jörg Hermann
Jan 26, 2020·Nature Communications·Ji-Lei LiXin-Shui Wang
Apr 15, 2021·Nature Communications·Xuyang MengRichard A Stern

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Methods Mentioned

BETA
X-ray

Software Mentioned

Peak Sight ©
EPMA
Cameca

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