• français
    • English
    français
  • Login
Help
View Item 
  •   Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
  • Home
  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Evidence of Dislocation Mixed Climb in Quartz From the Main Central and Moine Thrusts: An Electron Tomography Study

Article dans une revue avec comité de lecture
Author
ccWEIDNER, Timmo
1002334 Unité Matériaux et Transformations - UMR 8207 [UMET]
ccMUSSI, Alexandre
1002334 Unité Matériaux et Transformations - UMR 8207 [UMET]
ccCASTELNAU, Olivier
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
KRONENBERG, Andreas
301080 Texas A&M University [College Station]
LAW, Richard
47147 Virginia Tech [Blacksburg]
CORDIER, Patrick
56663 Institut universitaire de France [IUF]
1002334 Unité Matériaux et Transformations - UMR 8207 [UMET]

URI
http://hdl.handle.net/10985/25489
DOI
10.1029/2024jb029083
Research data linked to this publication
10.5281/zenodo.
Date
2024-07
Journal
Journal of Geophysical Research: Solid Earth

Abstract

In this study we apply electron tomography to characterize 3D dislocation microstructures in two quartz mylonite specimens from the Moine and Main Central Thrusts, both of which accommodated displacements by dislocation creep in the presence of water. Both specimens show dislocation activity with dislocation densities of the order of 3–4 × 1012 m−2 and evidence of recovery from the presence of subgrain boundaries. ⟨a⟩ slip occurs predominantly on pyramidal and prismatic planes (⟨a⟩ basal glide is not active). [c] Glide is not significant. On the other hand, we observe a very high level of activation of ⟨c + a⟩ glide on the , , (n = 1,2) and even planes. Approximately 60% of all dislocations show evidence of climb with a predominance of mixed climb, a deformation mechanism characterized by dislocations moving in a plane intermediate between the glide and the climb planes. This atypical mode of deformation demonstrates comparable glide and climb efficiency under natural deformation conditions. It promotes dislocation glide in planes not expected for the quartz structure, probably by inhibiting lattice friction. Our quantitative characterization of the microstructure enables us to assess the strain that dislocations can generate. We show that glide systems indicated by the observed dislocations are sufficient to accommodate any arbitrary 3D strain by themselves. Although historically dislocation glide has been regarded as being primarily responsible for producing strain, activation of climb can also directly contribute to the finite strain. On the basis of this characterization, we propose a numerical modeling approach for attempting to characterize the local stress state that gave rise to the observed microstructure.

Files in this item

Name:
PIMM_JGRSE_2024_CASTELNAU.pdf
Size:
4.235Mb
Format:
PDF
Description:
Evidence of Dislocation Mixed ...
View/Open
CC BY-NC
This document is available under CC BY-NC license

Collections

  • Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

Related items

Showing items related by title, author, creator and subject.

  • Application of electron tomography of dislocations in beam-sensitive quartz to the determination of strain components 
    Article dans une revue avec comité de lecture
    MUSSI, Alexandre; GALLET, Julien; CASTELNAU, Olivier; CORDIER, Patrick (Elsevier, 2021)
    In this study we apply electron tomography of dislocations to quartz with a view to assess whether the von Mises-Taylor criterion is satisfied or violated in a deformed crystal of quartz. We propose a method to perform ...
  • Effective viscoplastic behavior of polycrystalline aggregates lacking four independent slip systems inferred from homogenization methods; application to olivine 
    Article dans une revue avec comité de lecture
    DETREZ, Fabrice; CASTELNAU, Olivier; CORDIER, Patrick; MERKEL, Sébastien; RATERRON, Paul (Elsevier, 2015)
    Polycrystalline aggregates lacking four independent systems for the glide of dislocations can deform in a purely viscoplastic regime only if additional deformation mechanisms (such as grain boundary sliding and diffusion) ...
  • Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation 
    Article dans une revue avec comité de lecture
    RATERRON, Paul; DETREZ, Fabrice; CASTELNAU, Olivier; BOLLINGER, Caroline; CORDIER, Patrick; MERKEL, Sébastien (Elsevier, 2014)
    We report a first application of an improved second-order (SO) viscoplastic self-consistent model for multiphase aggregates, applied to an olivine + diopside aggregate as analogue for a dry upper mantle peridotite deformed ...
  • Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach 
    Article dans une revue avec comité de lecture
    CASTELNAU, Olivier; CORDIER, Patrick; LEBENSON, RA; MERKEL, SEBASTIEN; RATERRON, PAUL (Centre Mersenne, 2010)
    The strongly anisotropic rheology of olivine polycrystals, associated to their microstructure, constitutes a key feature affecting the dynamics of the Earth's upper mantle. High pressure deformation experiments carried out ...
  • Multiscale modeling of the effective viscoplastic behavior of Mg 2 SiO 4 wadsleyite: bridging atomic and polycrystal scales 
    Article dans une revue avec comité de lecture
    CASTELNAU, Olivier; RITTERBEX, S.; CARREZ, P.; CORDIER, P.; MOULINEC, H.; ccDERRIEN, Katell (Elsevier Masson, 2020)
    The viscoplastic behavior of polycrystalline Mg2SiO4 wadsleyite aggregates, a major high pressure phase of the mantle transition zone of the Earth (depth range: 410–520 km), is obtained by properly bridging several scale ...

Browse

All SAMCommunities & CollectionsAuthorsIssue DateCenter / InstitutionThis CollectionAuthorsIssue DateCenter / Institution

Newsletter

Latest newsletterPrevious newsletters

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales