Title :

Deformation Mechanisms, Microstructures, and Seismic Anisotropy of Wadsleyite in the Earth's Transition Zone

Author(s) :

Ledoux, Estelle [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Saki, Morvarid [Auteur]
Institut für Geophysik [Münster]
Gay, Jeffrey-Phillip [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Krug, Matthias [Auteur]
Westfälische Wilhelms-Universität Münster = University of Münster [WWU]
Castelnau, Olivier [Auteur]
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
Zhou, Wen‐Yi [Auteur]
Texas A&M University [College Station]
Zhang, Jin S. [Auteur]
Texas A&M University [College Station]
Chantel, Julien [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Hilairet, Nadege [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Bykov, Maxim [Auteur]

Bykova, Elena [Auteur]
Goethe-Universität Frankfurt am Main
Aprilis, Georgios [Auteur]
Universität Bayreuth [Deutschland] = University of Bayreuth [Germany] = Université de Bayreuth [Allemagne]
Svitlyk, Volodymyr [Auteur]
European Synchrotron Radiation Facility [ESRF]
Garbarino, Gaston [Auteur]
European Synchrotron Radiation Facility [Grenoble] [ESRF]
Sanchez‐Valle, Carmen [Auteur]
Westfälische Wilhelms-Universität Münster = University of Münster [WWU]
Thomas, Christine [Auteur]
Institut für Geophysik [Münster]
Speziale, Sergio [Auteur]

Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207

Journal title :

Geochemistry, Geophysics, Geosystems

Abbreviated title :

Geochem Geophys Geosyst

Volume number :

24

Pages :

e2023GC011026

Publisher :

American Geophysical Union (AGU)

Publication date :

2023-11

ISSN :

1525-2027

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

English abstract : [en]

AbstractWadsleyite is the dominant mineral of the upper portion of the Earth's mantle transition zone (MTZ). As such, understanding plastic deformation of wadsleyite is relevant for the interpretation of observations of ...
Show more >AbstractWadsleyite is the dominant mineral of the upper portion of the Earth's mantle transition zone (MTZ). As such, understanding plastic deformation of wadsleyite is relevant for the interpretation of observations of seismic signals from this region in terms of mantle flow. Despite its relevance, however, the deformation mechanisms of wadsleyite and their effects on microstructures and anisotropy are still poorly understood. Here, we present the results of new deformation experiments on polycrystalline wadsleyite at temperatures of 1400–1770 K and pressures between 12.3 and 20.3 GPa in the laser‐heated diamond anvil cell. We rely on multigrain X‐ray crystallography to follow the evolution of individual grain orientations and extract lattice preferred orientations at the sample scale at different steps of the experiments. A comparison of experimental results of our work and the literature with polycrystal plasticity simulations, indicates that ⟨111⟩{101} is the most active slip system of dislocations in wadsleyite at all investigated conditions. Secondary slip systems such as [001](010), [100](001), and [100]{0kl}, however, play a critical role in the resulting microstructures and their activity depends on both temperature and water content, from which we extract an updated deformation map of wadsleyite at MTZ conditions. Lastly, we propose several seismic anisotropy models of the upper part of the MTZ, depending on temperature, geophysical context, and levels of hydration that will be useful for the interpretation of seismic signals from the MTZ in terms of mantle flow and water content.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

ANR Project :

Transformations de phase, microstructures, et leur signatures sismiques dans le manteau terrestre

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2023-11-16T08:39:09Z
2023-11-16T09:33:42Z
2023-11-16T10:15:55Z
2023-11-17T09:53:32Z