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Publication Detail
The development of shape- and crystallographic-preferred orientation in CaPtO3 post-perovskite deformed in pure shear
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    McCormack R, Dobson DP, Walte NP, Miyajima N, Taniguchi T, Wood IG
  • Publisher:
    MINERALOGICAL SOC AMER
  • Publication date:
    10/2011
  • Pagination:
    1630, 1635
  • Journal:
    AM MINERAL
  • Volume:
    96
  • Issue:
    10
  • Print ISSN:
    0003-004X
  • Language:
    EN
  • Keywords:
    CaPtO3, post-perovskite, deformation mechanism, shape-preferred orientation, crystallographic-preferred orientation, seismic anisotropy, EARTHS LOWER MANTLE, SEISMIC ANISOTROPY, D''-LAYER, PLASTIC-DEFORMATION, CAIRO3 PEROVSKITE, THERMAL-EXPANSION, PHASE-TRANSITION, LOWERMOST MANTLE, MGSIO3, PRESSURES
  • Addresses:
    McCormack, R
    UCL
    Dept Earth Sci
    London
    WC1E 6BT
    England
Abstract
Knowledge of the deformation mechanism of post-perovskite is important for interpreting observed seismic anisotropy in terms of mantle flow. Experiments on post-perovskite MgSiO3 and the low-pressure analog material CaIrO3 yield different textures, leaving the interpretation of the observed seismic signatures unclear. Here we present results of deformation experiments on CaPtO3 post-perovskite that may be a better analog to MgSiO3. Post-perovskite CaPtO3 deforms by glide of [100] dislocations on the (010) plane, consistent with previous experimental results on CaIrO3. In addition, samples containing a weak minority phase also display shape-preferred orientation with grains elongated in the crystallographic a-direction forming a planar fabric perpendicular to the compression direction. This shape-preferred orientation strengthens the observed crystallographic-preferred orientation and results in a rapid development of texture during deformation. This observation supports the recent suggestion that the D '' reflector might be due to a rapid generation of texture in post-perovskite. Furthermore, the role of shape-preferred orientation in generating seismic anisotropy in multi-phase assemblages should be considered for the D '' assemblage.
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Dept of Earth Sciences
Dept of Earth Sciences
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