Report

In Situ Observation of the Formation of 10 Å Phase from Talc + H2O at Mantle Pressures and Temperatures

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Science  29 Oct 1999:
Vol. 286, Issue 5441, pp. 940-942
DOI: 10.1126/science.286.5441.940

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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.

  • * Present address: Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, UK.

  • To whom correspondence should be addressed. E-mail: alison.pawley{at}man.ac.uk

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