A new hydrous silicate, a water reservoir, in the upper part of the lower mantle

Eiji Ohtani, Hiroki Mizobata, Yasuhiro Kudoh, Toshiro Nagase, Haruo Arashi, Hisayoshi Yurimoto, Isoji Miyagi

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

We synthesized a new hydrous silicate in the pressure range from 20 GPa to 24 GPa at 800-1300°C. This phase, named tentatively as phase G, has a hexagonal unit cell, a=4.790(3)Å and c=4.344(3)Å, and V=86.3(2)Å3 and the atomic ratio Mg/Si=0.66±0.03. SIMS analysis revealed that it contains 14.5±2.0wt% water. Phase G has a chemical formula of Mg1.14Si1.73H2.81O6 and a density of 3.37g/cm3. Phase G coexists with periclase and Mg-perovskite under the lower mantle conditions, and thus it can be a reservoir of water in cold slabs penetrating into the lower mantle.

Original languageEnglish
Article number97GL00874
Pages (from-to)1047-1050
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number9
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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