Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas
- 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.
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| Author: | Antoine Benard, Kevin Klimm, Alan B. WoodlandGND, Richard Arculus, Max Wilke, Roman E. Botcharnikov, Nobumichi Shimizu, Oliver Nebel, Camille Rivard, Dmitri A. Ionov |
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| URN: | urn:nbn:de:hebis:30:3-477281 |
| DOI: | https://doi.org/10.1038/s41467-018-05804-2 |
| ISSN: | 2041-1723 |
| Pubmed Id: | https://pubmed.ncbi.nlm.nih.gov/30158630 |
| Parent Title (English): | Nature Communications |
| Publisher: | Nature Publishing Group UK |
| Place of publication: | [London] |
| Document Type: | Article |
| Language: | English |
| Year of Completion: | 2018 |
| Date of first Publication: | 2018/08/29 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Release Date: | 2018/10/23 |
| Tag: | Geochemistry; Petrology |
| Volume: | 9 |
| Issue: | 1, Art. 3500 |
| Page Number: | 10 |
| First Page: | 1 |
| Last Page: | 10 |
| Note: | 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/. |
| HeBIS-PPN: | 438423720 |
| Institutes: | Geowissenschaften / Geographie / Geowissenschaften |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
| Sammlungen: | Universitätspublikationen |
| Open-Access-Publikationsfonds: | Geowissenschaften / Geographie |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
