The high-pressure stability of talc and 10 Å phase

potential storage sites for H2O in subduction zones

A. R. Pawley, B. J. Wood

    Research output: Contribution to journalArticle

    102 Citations (Scopus)

    Abstract

    The pressure-temperature conditions of the reactions governing the high-pressure stability of talc were investigated in experiments on the bulk composition Mg3Si4O10(OH)2 + H2O at 2.9-6.8 GPa, 650-820°C, using piston-cylinder and multianvil apparatus. The reaction talc = enstatite + coesite + vapor was bracketed between 800 and 820°C at 2.90-2.95 GPa and between 770 and 780°C at 3.77-4.02 GPa. The lower-pressure bracket, which is just above the quartz-coesite phase transition, is consistent with some of the previous brackets on the reaction talc = enstatite + quartz + vapor and with the position of the talc dehydration reaction calculated using THERMOCALC v2.4. This revised version of THERMOCALC incorporates new compressibility and thermal expansivity data for talc. -from Authors

    Original languageEnglish
    Pages (from-to)998-1003
    Number of pages6
    JournalAmerican Mineralogist
    Volume80
    Issue number9-10
    Publication statusPublished - 1995

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