52149
2018
2018
eng
10
9
article
Nature Publ. Group
London
1
--
2018-08-29
--
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+/Sigma 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 delta S-34 (+ 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.
Nature Communications
10.1038/s41467-018-05804-2
30158630
2041-1723
wos:2018
3500
WOS:000442998800005
Benard, A (reprint author), Australian Natl Univ, Res Sch Earth Sci, Acton, ACT 2601, Australia.; Benard, A (reprint author), Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia.; Klimm, K (reprint author), Goethe Univ Frankfurt, Inst Geowissensch, D-60438 Frankfurt, Germany.; Benard, A (reprint author), Inst Earth Sci, Geopolis, CH-1015 Lausanne, Switzerland., antoine.benard@unil.ch; klimm@em.uni-frankfurt.de
Australian Research CouncilAustralian Research Council [DE120100513, DP120104240]; ESRF [EC1061, ES238]
2021-10-12T07:31:14+00:00
sword
importub
filename=package.tar
b49fbdbae399e44c8f6f2dccec04072a
<a href="https://doi.org/10.25932/publishup-42618">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 717 </a>
Benard, Antoine
Klimm, Kevin
false
true
CC-BY - Namensnennung 4.0 International
Antoine Benard
Kevin Klimm
Alan B. Woodland
Richard J. Arculus
Max Wilke
Roman E. Botcharnikov
Nobumichi Shimizu
Oliver Nebel
Camille Rivard
Dmitri A. Ionov
Naturwissenschaften und Mathematik
Institut für Geowissenschaften
Import
42618
2018
2019
eng
10
717
postprint
1
2019-05-29
2019-05-29
--
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.
Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
urn:nbn:de:kobv:517-opus4-426184
1866-8372
10.25932/publishup-42618
online registration
Nature Communications 9 (2018) Art. 3500 DOI: 10.1038/s41467-018-05804-2
3500
<a href="http://publishup.uni-potsdam.de/52149">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
CC-BY - Namensnennung 4.0 International
Antoine Bénard
Kevin Klimm
Alan B. Woodland
Richard J. Arculus
Max Wilke
Roman E. Botcharnikov
Nobumichi Shimizu
Oliver Nebel
Camille Rivard
Dmitri A. Ionov
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
717
eng
uncontrolled
Andesitic Avacha volcano
eng
uncontrolled
oxidation-state
eng
uncontrolled
oxygen fugacity
eng
uncontrolled
subduction zones
eng
uncontrolled
peridotite xenoliths
eng
uncontrolled
sulfur speciation
eng
uncontrolled
redox state
eng
uncontrolled
island-arc
eng
uncontrolled
dissolution mechanism
eng
uncontrolled
basaltic systems
Naturwissenschaften und Mathematik
open_access
Mathematisch-Naturwissenschaftliche Fakultät
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/42618/pmnr717.pdf