Physics and Chemistry of Minerals

, Volume 33, Issue 10, pp 711–721 | Cite as

Decomposition of kyanite and solubility of Al2O3 in stishovite at high pressure and high temperature conditions

  • Xi Liu
  • Norimasa Nishiyama
  • Takeshi Sanehira
  • Toru Inoue
  • Yuji Higo
  • Shizue Sakamoto
Original Paper

Abstract

In order to constrain the high-pressure behavior of kyanite, multi-anvil experiments have been carried out from 15 to 25 GPa, and 1,350 to 2,500°C. Both forward and reversal approaches to phase equilibria were adopted in these experiments. We find that kyanite breaks down to stishovite + corundum at pressures above ∼15 GPa, and stishovite + corundum should be the stable phase assemblage at the pressure–temperature conditions of the transition zone and the uppermost part of the lower mantle of the Earth, in agreement with previous multi-anvil experimental studies and ab initio calculation results, but in disagreement with some of the diamond-anvil cell experimental studies in the literature. The Al2O3 solubility in nominally dry stishovite has been tightly bracketed by forward and reversal experiments; it is slightly but consistently reduced by pressure increase. Its response to temperature increase, however, is more complicated: increases at low temperatures, maximizes at around 2,000°C, and perhaps decreases at higher temperatures. Consequently, the Al2O3 solubility in dry stishovite at conditions of high temperature–high pressure is very limited.

Keywords

Al2O3 solubility in stishovite Corundum Kyanite Phase equilibrium Stishovite 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Xi Liu
    • 1
    • 2
  • Norimasa Nishiyama
    • 1
  • Takeshi Sanehira
    • 1
  • Toru Inoue
    • 1
  • Yuji Higo
    • 1
  • Shizue Sakamoto
    • 1
  1. 1.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  2. 2.Department of Earth SciencesUniversity of Western OntarioLondonCanada

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