Rheological study of bridgmanite at the lower mantle

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Abstract

Knowledge of rheological properties of bridgmanite, which is the most abundant mineral at the lower mantle, is one of the most important parameters to understand mantle dynamics. We developed deformation experimental technique up to the top of lower mantle conditions using D-DIA apparatus as Kawai-type (6-8 type) Press. Using this technique, crystallographic-preferred-orientation (CPO) of bridgmanite induced by shear deformation was determined. The seismic shear wave anisotropy observed around subduction zone at the lower mantle, can be explained in terms of the CPO of bridgmanite with mantle flow parallel to the direction of subduction zone. We also succeeded to measure the viscosity of bridgmanite in dislocation creep regime by in-situ deformation experiments.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Volume28
Issue number2
DOIs
Publication statusPublished - 2018

Keywords

  • Bridgmanite
  • Deformation experiments
  • Mantle dynamics
  • Rheology
  • The lower mantle

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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