Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates

L. Kerschhofer; M. Liu; D. C. Rubie; J. D.C. McConnell; T. G. Sharp; C. Dupas

doi:10.4131/jshpreview.7.28

Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates

L. Kerschhofer, M. Liu, D. C. Rubie, J. D.C. McConnell, T. G. Sharp, C. Dupas

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

During the transformation of olivine (Fo₉₀) to ringwoodite and wadsleyite at 18–20 GPa three transformation microstructures develop: (i) Reaction rims form around olivine by incoherent grain boundary nucleation; the growth rates of these rims decrease strongly with reaction time because the volume decrease causes elastic strain to develop. (ii) Intracrystalline, coherent ringwoodite lamellae nucleate on previously formed (100)_α stacking faults. (iii) Polycrystalline ringwoodite and/or wadsleyite lenses develop in the interior of relict olivine crystals by nucleation of incoherent grains on the coherent ringwoodite lamellae. The observed intracrystalline transformation mechanism and the time-dependence of growth have important implications for predicting the depth of the olivine-spinel transformation in subducting lithosphere.

Original language	English (US)
Pages (from-to)	28-33
Number of pages	6
Journal	Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume	7
DOIs	https://doi.org/10.4131/jshpreview.7.28
State	Published - 1998

Keywords

High pressure transformation mechanism
Intracrystalline nucleation
Olivine
Subduction
Transformational strain

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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title = "Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates",

abstract = "During the transformation of olivine (Fo90) to ringwoodite and wadsleyite at 18–20 GPa three transformation microstructures develop: (i) Reaction rims form around olivine by incoherent grain boundary nucleation; the growth rates of these rims decrease strongly with reaction time because the volume decrease causes elastic strain to develop. (ii) Intracrystalline, coherent ringwoodite lamellae nucleate on previously formed (100)α stacking faults. (iii) Polycrystalline ringwoodite and/or wadsleyite lenses develop in the interior of relict olivine crystals by nucleation of incoherent grains on the coherent ringwoodite lamellae. The observed intracrystalline transformation mechanism and the time-dependence of growth have important implications for predicting the depth of the olivine-spinel transformation in subducting lithosphere.",

keywords = "High pressure transformation mechanism, Intracrystalline nucleation, Olivine, Subduction, Transformational strain",

author = "L. Kerschhofer and M. Liu and Rubie, {D. C.} and McConnell, {J. D.C.} and Sharp, {T. G.} and C. Dupas",

year = "1998",

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language = "English (US)",

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T1 - Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates

AU - Kerschhofer, L.

AU - Liu, M.

AU - Rubie, D. C.

AU - McConnell, J. D.C.

AU - Sharp, T. G.

AU - Dupas, C.

PY - 1998

Y1 - 1998

N2 - During the transformation of olivine (Fo90) to ringwoodite and wadsleyite at 18–20 GPa three transformation microstructures develop: (i) Reaction rims form around olivine by incoherent grain boundary nucleation; the growth rates of these rims decrease strongly with reaction time because the volume decrease causes elastic strain to develop. (ii) Intracrystalline, coherent ringwoodite lamellae nucleate on previously formed (100)α stacking faults. (iii) Polycrystalline ringwoodite and/or wadsleyite lenses develop in the interior of relict olivine crystals by nucleation of incoherent grains on the coherent ringwoodite lamellae. The observed intracrystalline transformation mechanism and the time-dependence of growth have important implications for predicting the depth of the olivine-spinel transformation in subducting lithosphere.

AB - During the transformation of olivine (Fo90) to ringwoodite and wadsleyite at 18–20 GPa three transformation microstructures develop: (i) Reaction rims form around olivine by incoherent grain boundary nucleation; the growth rates of these rims decrease strongly with reaction time because the volume decrease causes elastic strain to develop. (ii) Intracrystalline, coherent ringwoodite lamellae nucleate on previously formed (100)α stacking faults. (iii) Polycrystalline ringwoodite and/or wadsleyite lenses develop in the interior of relict olivine crystals by nucleation of incoherent grains on the coherent ringwoodite lamellae. The observed intracrystalline transformation mechanism and the time-dependence of growth have important implications for predicting the depth of the olivine-spinel transformation in subducting lithosphere.

KW - High pressure transformation mechanism

KW - Intracrystalline nucleation

KW - Olivine

KW - Subduction

KW - Transformational strain

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ER -

Intracrystalline Olivine-Ringwoodite Transformation and Time-Dependent Growth Rates

Abstract

Keywords

ASJC Scopus subject areas

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