Details
| Original language | English |
|---|---|
| Article number | 3500 |
| Journal | Nature Communications |
| Volume | 9 |
| Publication status | Published - 29 Aug 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 SO4 2− 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.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Biochemistry, Genetics and Molecular Biology(all)
- General Biochemistry,Genetics and Molecular Biology
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Nature Communications, Vol. 9, 3500, 29.08.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas
AU - Bénard, Antoine
AU - Klimm, Kevin
AU - Woodland, Alan B.
AU - Arculus, Richard J.
AU - Wilke, Max
AU - Botcharnikov, Roman E.
AU - Shimizu, Nobumichi
AU - Nebel, Oliver
AU - Rivard, Camille
AU - Ionov, Dmitri A.
N1 - Funding information: We acknowledge financial support by the Australian Research Council (DE120100513 and DP120104240) and the ESRF for beam time (EC1061 and ES238). We acknowledge the ESRF for providing access to synchrotron radiation and the team ID21 for technical support. A.B. thanks L. Uenver-Thiele, R. Rapp and F. Brink for their assistance with Raman, EPMA and SEM, respectively. We thank Elizabeth Cottrell and Keiko Hattori for their constructive and helpful comments.
PY - 2018/8/29
Y1 - 2018/8/29
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 SO4 2− 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.
AB - 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 SO4 2− 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.
UR - http://www.scopus.com/inward/record.url?scp=85052674096&partnerID=8YFLogxK
U2 - 10.1038/s41467-018-05804-2
DO - 10.1038/s41467-018-05804-2
M3 - Article
C2 - 30158630
AN - SCOPUS:85052674096
VL - 9
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 3500
ER -