Stability field of new hydrous phase, δ-AIOOH, with implications for water transport into the deep mantle

Eiji Ohtani, Konstantin Litasov, Akio Suzuki, Tadashi Kondo

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

We report stability field of a new hydrous phase ε- AIOOH, which is a high pressure polymorph of diaspore. This phase is stable at pressures from 17 GPa to at least up 25 GPa at around 1000 to 1200°C, which are likely conditions expected in the slabs descending into the lower mantle. This phase contains significant amounts of octahedrally coordinated Mg and Si in solid solution. The oxygen arrangement of ε- AIOOH is similar to that of the post-stishovite phase, CaCl2 type SiO2, which exists in the deep lower mantle. ε-AIOOH may play an important role as a water reservoir in subducting slabs.

Original languageEnglish
Pages (from-to)3991-3993
Number of pages3
JournalGeophysical Research Letters
Volume28
Issue number20
DOIs
Publication statusPublished - 2001 Oct 15

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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