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Dislocations in naturally deformed olivine: Example of a mylonitic peridotite.

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Title: Dislocations in naturally deformed olivine: Example of a mylonitic peridotite.
Authors: Demouchy, Sylvie1,2 (AUTHOR) sylvie.demouchy@uca.fr, Mussi, Alexandre3 (AUTHOR), Weidner, Timmo3 (AUTHOR), Gardés, Emmanuel2 (AUTHOR), Cordier, Patrick3,4 (AUTHOR)
Source: Physics of the Earth & Planetary Interiors. Jan2024, Vol. 346, pN.PAG-N.PAG. 1p.
Subjects: Olivine, Peridotite, Transmission electron microscopy, Image transmission, Dislocations in crystals
Geographic Terms: Oman
Abstract: We have investigated the microstructure of naturally deformed olivine (chemically equilibrated at 1000 °C) by conventional transmission electron microscopy and electron tomography. The peridotite specimen, from Oman ophiolite, has a mylonitic microstructure with remnant, strongly deformed, millimetric porphyroclasts co-existing with small newly formed olivine grains generated by dynamic recrystallization. Imaging by transmission electron microscopy reveals that both newly formed grains and porphyroclasts display [100] and [001] dislocations activity. Subgrain boundaries are composed of either [100] or [001] dislocations. The characterization of this natural sample also permits to identify sporadic [100] dislocation loops, rare [010] dislocation, infrequent melt, and intragranular bubbles or along subgrain boundaries. Electron tomography permits to identify several glide planes, which are similar to previous observations acquired on experimentally deformed polycrystalline olivine, more importantly electron tomography also permits to evidence combination of glide, climb and mixed climb (dislocation moving in an intermediate plane between the plane of glide plane and the plane of pure climb). Our study further infers the diversity of linear defects responsible for plastic deformation of olivine at lithospheric conditions. [Display omitted] • We studied by TEM olivine grains in a mylonitic peridotite from Oman ophiolite • Both newly formed grains and porphyroclasts display [100] and [001] dislocations • We identify sporadic [100] dislocation loops, rare [010] dislocation in olivine • Electron tomography permits to evidence combination of glide, climb and mixed climb [ABSTRACT FROM AUTHOR]
Copyright of Physics of the Earth & Planetary Interiors is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 174560938
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Dislocations in naturally deformed olivine: Example of a mylonitic peridotite.
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  Data: <searchLink fieldCode="AR" term="%22Demouchy%2C+Sylvie%22">Demouchy, Sylvie</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> sylvie.demouchy@uca.fr</i><br /><searchLink fieldCode="AR" term="%22Mussi%2C+Alexandre%22">Mussi, Alexandre</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Weidner%2C+Timmo%22">Weidner, Timmo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gardés%2C+Emmanuel%22">Gardés, Emmanuel</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cordier%2C+Patrick%22">Cordier, Patrick</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Physics+of+the+Earth+%26+Planetary+Interiors%22">Physics of the Earth & Planetary Interiors</searchLink>. Jan2024, Vol. 346, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Olivine%22">Olivine</searchLink><br /><searchLink fieldCode="DE" term="%22Peridotite%22">Peridotite</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Image+transmission%22">Image transmission</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocations+in+crystals%22">Dislocations in crystals</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Oman%22">Oman</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We have investigated the microstructure of naturally deformed olivine (chemically equilibrated at 1000 °C) by conventional transmission electron microscopy and electron tomography. The peridotite specimen, from Oman ophiolite, has a mylonitic microstructure with remnant, strongly deformed, millimetric porphyroclasts co-existing with small newly formed olivine grains generated by dynamic recrystallization. Imaging by transmission electron microscopy reveals that both newly formed grains and porphyroclasts display [100] and [001] dislocations activity. Subgrain boundaries are composed of either [100] or [001] dislocations. The characterization of this natural sample also permits to identify sporadic [100] dislocation loops, rare [010] dislocation, infrequent melt, and intragranular bubbles or along subgrain boundaries. Electron tomography permits to identify several glide planes, which are similar to previous observations acquired on experimentally deformed polycrystalline olivine, more importantly electron tomography also permits to evidence combination of glide, climb and mixed climb (dislocation moving in an intermediate plane between the plane of glide plane and the plane of pure climb). Our study further infers the diversity of linear defects responsible for plastic deformation of olivine at lithospheric conditions. [Display omitted] • We studied by TEM olivine grains in a mylonitic peridotite from Oman ophiolite • Both newly formed grains and porphyroclasts display [100] and [001] dislocations • We identify sporadic [100] dislocation loops, rare [010] dislocation in olivine • Electron tomography permits to evidence combination of glide, climb and mixed climb [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Physics of the Earth & Planetary Interiors is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.pepi.2023.107125
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Olivine
        Type: general
      – SubjectFull: Peridotite
        Type: general
      – SubjectFull: Transmission electron microscopy
        Type: general
      – SubjectFull: Image transmission
        Type: general
      – SubjectFull: Dislocations in crystals
        Type: general
      – SubjectFull: Oman
        Type: general
    Titles:
      – TitleFull: Dislocations in naturally deformed olivine: Example of a mylonitic peridotite.
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            NameFull: Demouchy, Sylvie
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            NameFull: Mussi, Alexandre
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            NameFull: Weidner, Timmo
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            NameFull: Gardés, Emmanuel
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            – D: 01
              M: 01
              Text: Jan2024
              Type: published
              Y: 2024
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              Value: 346
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