In situ X-ray observation of 10 Å phase stability at high pressure

Sergey V. Rashchenko, Seiji Kamada, Naohisa Hirao, Konstantin D. Litasov, Eiji Ohtani

Research output: Contribution to journalArticle

Abstract

The 10 Å phase, Mg3Si4O10(OH)2·H2O, is a high-pressure hydrous phyllosilicate considered as an important link in the succession of hydrous phases transporting water into the deep mantle. In this study, in situ synchrotron X-ray diffraction combined with external heating diamond-Anvil cell was used to determine limits of the 10 Å phase stability at pressures above 7 GPa. A reaction "10 Å phase + H2O → hydroxide-perovskite (3.65 Å phase) + stishovite" at about 10 GPa was found to be a high-pressure boundary of the 10 Å phase stability field. A dehydration temperature of the 10 Å phase "10 Å phase → enstatite + stishovite + H2O" decreases with pressure from 690 °C at 7 GPa to 450 °C at 10 GPa; a nonvariant point where 10 Å phase, hydroxide-perovskite and enstatite coexist in the presence of stishovite and hydrous fluid was found near 10 GPa and 450 °C.

Original languageEnglish
Pages (from-to)2564-2569
Number of pages6
JournalAmerican Mineralogist
Volume101
Issue number11
DOIs
Publication statusPublished - 2016 Nov 1

Keywords

  • 10 Å phase
  • 3.65 Å phase
  • DHMS
  • deep water cycle
  • hydroxide-perovskite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Rashchenko, S. V., Kamada, S., Hirao, N., Litasov, K. D., & Ohtani, E. (2016). In situ X-ray observation of 10 Å phase stability at high pressure. American Mineralogist, 101(11), 2564-2569. https://doi.org/10.2138/am-2016-5764