In situ observation of the formation of 10 Å phase from talc + H2O at mantle pressures and temperatures

Nicholas J. Chinnery, Alison R. Pawley*, Simon M. Clark

*Corresponding author for this work

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Development of an x-ray-transparent capsule that is suitable for water- saturated experiments has allowed the high-pressure and high-temperature synthesis of 10 angstrom phase from talc + H2O to be observed in situ in a multianvil apparatus with synchrotron radiation. The reaction talc + H2O = 10 angstrom phase was observed within 20 minutes at 6 gigapascals and 500°C. The higher pressure vapor-absent reaction talc = 10 angstrom phase + enstatite + coesite was also observed. The 10 angstrom phase is therefore a good candidate for transporting water into Earth's mantle at subduction zones. The in situ technique may allow the hydration of other high-pressure mantle phases to be observed under dynamic conditions.

Original languageEnglish
Pages (from-to)940-942
Number of pages3
JournalScience
Volume286
Issue number5441
DOIs
Publication statusPublished - 29 Oct 1999
Externally publishedYes

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