In situ measurements of the Majorite-Akimotoite-Perovskite phase transition boundaries in MgSiO3

Kei Hirose, Tetsuya Komabayashi, Motohiko Murakami, Ken Ichi Funakoshi

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65 Citations (Scopus)

Abstract

Here we report the phase boundaries between majorite, akimotoite (ilmenite), and perovskite in MgSiO3 determined by in situ measurements in a multi-anvil apparatus. We used both gold and platinum as internal pressure standards at high pressure and temperature. Our results obtained at 1400-2000°C, together with previous results obtained at 1000-1200°C by Ono et al. [2001], precisely locate the akimotoite-perovskite transition boundary at P (GPa) = 25.09 - 0.0027 × T (°C), based on the P-V-T equation of state of gold [Anderson et al., 1989]. Our new experimental data show the position of triple point to be 20.0 GPa and 1920°C. The present measurements reconfirm our earlier study [Hirose et al., 2001] that Anderson's gold pressure scale gives slightly higher pressures than the platinum pressure scale proposed either by Jamieson et al. [1982] or Holmes et al. [1989].

Original languageEnglish
Pages (from-to)4351-4354
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number23
DOIs
Publication statusPublished - 2001 Dec 1

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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