In situ formation of coestite under hydrothermal conditions

M. C. Wilding, C. J. Ridley, C. L. Bull, J. B. Parise

Research output: Contribution to journalArticlepeer-review

Abstract

We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.

Original languageEnglish
Pages (from-to)478-487
Number of pages10
JournalHigh Pressure Research
Volume40
Issue number4
DOIs
StatePublished - Oct 1 2020
Externally publishedYes

Keywords

  • fluid
  • High pressure
  • mantle
  • melting
  • neutron diffraction

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