Physics and Chemistry of Minerals

, Volume 16, Issue 4, pp 320–330 | Cite as

Electron microscopy of high-pressure phases synthesized from natural olivine in diamond anvil cell

  • M. Madon
  • F. Guyot
  • J. Peyronneau
  • J. P. Poirier
Article
Received:

Abstract

The products of the transformation of natural (Mg0.83Fe0.17)2SiO4 olivine have been prepared at various high pressures (between 25 GPa and 90 GPa), and high temperature in a laser-heated diamond-anvil cell (DAC). Studies of the high-pressure phases have been made by transmission electron microscopy (TEM), and X-ray microanalysis.

The olivine/spinel boundaries exhibit all the characteristics of a diffusionless shear transition, having a finely sheared structure and a constant orientation relationship between the close-packed planes of the two structures ((100)ol∥(111)sp).

The TEM observations of zones where olivine (or spinel) transforms into post-spinel phases show that the transformation possesses the features of an eutectoïdal decomposition, leading to a lamellar intergrowth of magnesiowüstite (Mg,Fe)O and perovskite (Mg,Fe)SiO3. With increasing temperature and/or decreasing pressure, the grain size of the high-pressure phases increases and obeys an Arrhenius law with an activation volume equal to zero. (Mg,Fe)O grains exhibit a very high density of dislocations (higher than 1011cm−2), whereas (Mg,Fe)SiO3 grains exhibit no dislocations but systematic twinning. The composition plane of the twins is (112) of the GdFeO3-type perovskite, corresponding to the {110} plane of the cubic lattice of ideal perovskite.

Keywords

Olivine Perovskite Orientation Relationship Transmission Electron Microscopy Observation Shear Transition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • M. Madon
    • 1
  • F. Guyot
    • 1
  • J. Peyronneau
    • 1
  • J. P. Poirier
    • 1
  1. 1.Institut de Physique du Globe de ParisParis CedexFrance

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