Experimental evidence supporting a global ...
Document type :
Article dans une revue scientifique
Permalink :
Title :
Experimental evidence supporting a global melt layer at the base of the Earth's upper mantle
Author(s) :
Freitas, D. [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Manthilake, Geeth [Auteur]
Université de Clermont-Ferrand
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Schiavi, F. [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [2017-2020] [UCA [2017-2020]]
Université Clermont Auvergne [UCA]
Chantel, Julien [Auteur]
Case Western Reserve University [Cleveland]
Department of Earth, Environmental, and Planetary Sciences [Cleveland]
Bolfan-Casanova, Nathalie [Auteur]
Université de Clermont-Ferrand
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Bouhifd, Mohammed Ali [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Andrault, Denis [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Manthilake, Geeth [Auteur]
Université de Clermont-Ferrand
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Schiavi, F. [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [2017-2020] [UCA [2017-2020]]
Université Clermont Auvergne [UCA]
Chantel, Julien [Auteur]
Case Western Reserve University [Cleveland]
Department of Earth, Environmental, and Planetary Sciences [Cleveland]
Bolfan-Casanova, Nathalie [Auteur]
Université de Clermont-Ferrand
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Bouhifd, Mohammed Ali [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Andrault, Denis [Auteur]
Observatoire de Physique du Globe de Clermont-Ferrand [OPGC]
Laboratoire Magmas et Volcans [LMV]
Université Clermont Auvergne [UCA]
Journal title :
Nature communications
Volume number :
8
Pages :
39
Publication date :
2017-12-19
HAL domain(s) :
Planète et Univers [physics]/Astrophysique [astro-ph]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
English abstract : [en]
The low-velocity layer (LVL) atop the 410-km discontinuity has been widely attributed to dehydration melting. In this study, we experimentally reproduced the wadsleyite-to-olivine phase transformation in the upwelling ...
Show more >The low-velocity layer (LVL) atop the 410-km discontinuity has been widely attributed to dehydration melting. In this study, we experimentally reproduced the wadsleyite-to-olivine phase transformation in the upwelling mantle across the 410-km discontinuity and investigated in situ the sound wave velocity during partial melting of hydrous peridotite. Our seismic velocity model indicates that the globally observed negative Vs anomaly (−4%) can be explained by a 0.7% melt fraction in peridotite at the base of the upper mantle. The produced melt is richer in FeO (~33 wt.%) and H2O (~16.5 wt.%) and its density is determined to be 3.56–3.74 g cm−3. The water content of this gravitationally stable melt in the LVL corresponds to a total water content in the mantle transition zone of 0.22 ± 0.02 wt.%. Such values agree with estimations based on magneto-telluric observations.Show less >
Show more >The low-velocity layer (LVL) atop the 410-km discontinuity has been widely attributed to dehydration melting. In this study, we experimentally reproduced the wadsleyite-to-olivine phase transformation in the upwelling mantle across the 410-km discontinuity and investigated in situ the sound wave velocity during partial melting of hydrous peridotite. Our seismic velocity model indicates that the globally observed negative Vs anomaly (−4%) can be explained by a 0.7% melt fraction in peridotite at the base of the upper mantle. The produced melt is richer in FeO (~33 wt.%) and H2O (~16.5 wt.%) and its density is determined to be 3.56–3.74 g cm−3. The water content of this gravitationally stable melt in the LVL corresponds to a total water content in the mantle transition zone of 0.22 ± 0.02 wt.%. Such values agree with estimations based on magneto-telluric observations.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
ENSCL
INRA
CNRS
ENSCL
INRA
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2019-05-16T17:21:30Z
2024-04-09T08:39:19Z
2024-04-09T08:39:19Z
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