TY  - JOUR
A1  - Benard, Antoine
A1  - Klimm, Kevin
A1  - Woodland, Alan B.
A1  - Arculus, Richard
A1  - Wilke, Max
A1  - Botcharnikov, Roman E.
A1  - Shimizu, Nobumichi
A1  - Nebel, Oliver
A1  - Rivard, Camille
A1  - Ionov, Dmitri A.
T1  - Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas
T2  - Nature Communications
N2  - 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.
KW  - Geochemistry
KW  - Petrology
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/47728
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-477281
SN  - 2041-1723
N1  - Rights and permissions: Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
VL  - 9
IS  - 1, Art. 3500
SP  - 1
EP  - 10
PB  - Nature Publishing Group UK
CY  - [London]
ER  -