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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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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Microstructures and OH-bearing nano-inclusions in "wet" olivine xenocrysts from the Udachnaya kimberlite.
N. Khisina, R. Wirth, S. Matsyuk, and M. Koch-Muller (2008)
European Journal of Mineralogy 20, 1067-1078
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Pressure-temperature studies of talc plus water using X-ray diffraction.
A.E. Gleason, S.A. Parry, A.R. Pawley, R. Jeanloz, and S.M. Clark (2008)
American Mineralogist 93, 1043-1050
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Kinetics of high-pressure mineral phase transformations using in situ time-resolved X-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and treatment.
J. P. Perrillat (2008)
Mineralogical Magazine 72, 683-695
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Effect of water on the phase relations in Earth's mantle and deep water cycle.
K. D. Litasov and E. Ohtani (2007)
Geological Society of America Special Papers 421, 115-156
   Abstract »    Full Text »    PDF »
Si vacancies in the 10-A phase.
M.D. Welch, A.R. Pawley, S.E. Ashbrook, H.E. Mason, and B.L. Phillips (2006)
American Mineralogist 91, 1707-1710
   Abstract »    Full Text »    PDF »
High-pressure phase transitions and hydrogen incorporation into MgSiO3 enstatite.
G. D. Bromiley and F. A. Bromiley (2006)
American Mineralogist 91, 1094-1101
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)