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Science 29 October 1999:
Vol. 286. no. 5441, pp. 940 - 942
DOI: 10.1126/science.286.5441.940
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Reports

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

Nicholas J. Chinnery, 1* Alison R. Pawley, 1dagger Simon M. Clark 2

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.

1 Department of Earth Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
2 Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, UK.
*   Present address: Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, UK.

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

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