Plastic deformation of silicate garnets. II. Deformation microstructures in natural samples

V. Voegelé, P. Cordier, V. Sautter, Thomas Sharp, J. M. Lardeaux, F. O. Marques

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We have used Transmission Electron Microscopy to characterize the deformation microstructures in natural garnets from several localities: eclogites from Sesia Lanzo (Alps), eclogites and garnet amphibolite from Braganca (Portugal), garnet pyroxenite from Lherz (France) and eclogites from Yakutia pipe (Siberia). Two characteristic microstructures have been identified. The first, found in eclogites from the Alps, consists of microplasticity associated with microcracking that suggests brittle behavior. The remaining samples show a microstructure characteristic of dislocation creep with recovery (sub-grain boundaries). The transition between these deformation regimes occurs at ≃600°C, i.e., at the boundary between group C and group B eclogites. The deformation microstructures suggest that the dislocations experience strong lattice friction below ≃600°C whereas at high temperature, diffusion assists dislocation glide and climb (recovery). We observed the following glide systems in the whole temperature range: 1/2(111){110}, 1/2(111){112}, 1/2(111){123}, (100){010}, and (100){011}. No correlation could be established between the dislocation microstructure and the hydrous component or the chemistry of the garnets among the pyralspites. Comparison of the natural deformation microstructures and those generated in high-pressure experiments [Voegele et al., 1998 (Part I)] validates the extrapolation of experimental data to nature.

Original languageEnglish (US)
Pages (from-to)319-338
Number of pages20
JournalPhysics of the Earth and Planetary Interiors
Volume108
Issue number4
DOIs
StatePublished - Aug 1 1998

Fingerprint

plastic deformation
garnets
silicates
garnet
microstructure
silicate
dislocation
recovery
dislocation creep
Portugal
Siberia
pyroxenite
grain boundary
amphibolite
France
transmission electron microscopy
extrapolation
friction
pipe
grain boundaries

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Plastic deformation of silicate garnets. II. Deformation microstructures in natural samples. / Voegelé, V.; Cordier, P.; Sautter, V.; Sharp, Thomas; Lardeaux, J. M.; Marques, F. O.

In: Physics of the Earth and Planetary Interiors, Vol. 108, No. 4, 01.08.1998, p. 319-338.

Research output: Contribution to journalArticle

Voegelé, V. ; Cordier, P. ; Sautter, V. ; Sharp, Thomas ; Lardeaux, J. M. ; Marques, F. O. / Plastic deformation of silicate garnets. II. Deformation microstructures in natural samples. In: Physics of the Earth and Planetary Interiors. 1998 ; Vol. 108, No. 4. pp. 319-338.
@article{0a10545841cc4c16a5f7bb8670cfb84f,
title = "Plastic deformation of silicate garnets. II. Deformation microstructures in natural samples",
abstract = "We have used Transmission Electron Microscopy to characterize the deformation microstructures in natural garnets from several localities: eclogites from Sesia Lanzo (Alps), eclogites and garnet amphibolite from Braganca (Portugal), garnet pyroxenite from Lherz (France) and eclogites from Yakutia pipe (Siberia). Two characteristic microstructures have been identified. The first, found in eclogites from the Alps, consists of microplasticity associated with microcracking that suggests brittle behavior. The remaining samples show a microstructure characteristic of dislocation creep with recovery (sub-grain boundaries). The transition between these deformation regimes occurs at ≃600°C, i.e., at the boundary between group C and group B eclogites. The deformation microstructures suggest that the dislocations experience strong lattice friction below ≃600°C whereas at high temperature, diffusion assists dislocation glide and climb (recovery). We observed the following glide systems in the whole temperature range: 1/2(111){110}, 1/2(111){112}, 1/2(111){123}, (100){010}, and (100){011}. No correlation could be established between the dislocation microstructure and the hydrous component or the chemistry of the garnets among the pyralspites. Comparison of the natural deformation microstructures and those generated in high-pressure experiments [Voegele et al., 1998 (Part I)] validates the extrapolation of experimental data to nature.",
author = "V. Voegel{\'e} and P. Cordier and V. Sautter and Thomas Sharp and Lardeaux, {J. M.} and Marques, {F. O.}",
year = "1998",
month = "8",
day = "1",
doi = "10.1016/S0031-9201(98)00111-3",
language = "English (US)",
volume = "108",
pages = "319--338",
journal = "Physics of the Earth and Planetary Interiors",
issn = "0031-9201",
publisher = "Elsevier",
number = "4",

}

TY - JOUR

T1 - Plastic deformation of silicate garnets. II. Deformation microstructures in natural samples

AU - Voegelé, V.

AU - Cordier, P.

AU - Sautter, V.

AU - Sharp, Thomas

AU - Lardeaux, J. M.

AU - Marques, F. O.

PY - 1998/8/1

Y1 - 1998/8/1

N2 - We have used Transmission Electron Microscopy to characterize the deformation microstructures in natural garnets from several localities: eclogites from Sesia Lanzo (Alps), eclogites and garnet amphibolite from Braganca (Portugal), garnet pyroxenite from Lherz (France) and eclogites from Yakutia pipe (Siberia). Two characteristic microstructures have been identified. The first, found in eclogites from the Alps, consists of microplasticity associated with microcracking that suggests brittle behavior. The remaining samples show a microstructure characteristic of dislocation creep with recovery (sub-grain boundaries). The transition between these deformation regimes occurs at ≃600°C, i.e., at the boundary between group C and group B eclogites. The deformation microstructures suggest that the dislocations experience strong lattice friction below ≃600°C whereas at high temperature, diffusion assists dislocation glide and climb (recovery). We observed the following glide systems in the whole temperature range: 1/2(111){110}, 1/2(111){112}, 1/2(111){123}, (100){010}, and (100){011}. No correlation could be established between the dislocation microstructure and the hydrous component or the chemistry of the garnets among the pyralspites. Comparison of the natural deformation microstructures and those generated in high-pressure experiments [Voegele et al., 1998 (Part I)] validates the extrapolation of experimental data to nature.

AB - We have used Transmission Electron Microscopy to characterize the deformation microstructures in natural garnets from several localities: eclogites from Sesia Lanzo (Alps), eclogites and garnet amphibolite from Braganca (Portugal), garnet pyroxenite from Lherz (France) and eclogites from Yakutia pipe (Siberia). Two characteristic microstructures have been identified. The first, found in eclogites from the Alps, consists of microplasticity associated with microcracking that suggests brittle behavior. The remaining samples show a microstructure characteristic of dislocation creep with recovery (sub-grain boundaries). The transition between these deformation regimes occurs at ≃600°C, i.e., at the boundary between group C and group B eclogites. The deformation microstructures suggest that the dislocations experience strong lattice friction below ≃600°C whereas at high temperature, diffusion assists dislocation glide and climb (recovery). We observed the following glide systems in the whole temperature range: 1/2(111){110}, 1/2(111){112}, 1/2(111){123}, (100){010}, and (100){011}. No correlation could be established between the dislocation microstructure and the hydrous component or the chemistry of the garnets among the pyralspites. Comparison of the natural deformation microstructures and those generated in high-pressure experiments [Voegele et al., 1998 (Part I)] validates the extrapolation of experimental data to nature.

UR - http://www.scopus.com/inward/record.url?scp=0032147755&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032147755&partnerID=8YFLogxK

U2 - 10.1016/S0031-9201(98)00111-3

DO - 10.1016/S0031-9201(98)00111-3

M3 - Article

VL - 108

SP - 319

EP - 338

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

SN - 0031-9201

IS - 4

ER -