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Pressure-temperature studies of talc plus water using X-ray diffraction

¹ Department of Earth and Planetary Science, University of California, Berkeley, McCone Hall 4767, Berkeley, Calfornia 94720, U.S.A.
² School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K.
³ Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, U.S.A.

Correspondence: ^* E-mail: aegleason{at}lbl.gov

X-ray diffraction measurements of natural talc plus water at combined pressures and temperatures of 0–15 GPa and 23–400 °C reveal the presence of a structural change that could be interpreted as a new high-pressure phase at 4.0 (±0.5) GPa, and raise the possibility that the newly inferred phase transition takes place in cold subducting slabs as a precursor to appearance of the 10 Å phase of talc.

Key Words: Talc • X-ray diffraction • high pressure • subduction