Abstract
Massonne (1981) reported experiments on the composition of muscovite in the assemblage phlogopite-muscovite-K-feldspar-quart. The experimental data have been used to recalculate the equilibrium conditions for the chlorite-muscovite-biotite-quartz assemblage which has been proposed as a new geobarometer by Powell and Evans (1983).
The recalculated equilibrium shows much steeperdp/dT slopes than those calculated by Powell and Evans (1983). Nevertheless, with the necessary precautions it is suggested that the barometer may provide the critical user with valuable pressure estimates.
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Bucher-Nurminen, K. A recalibration of the chlorite—biotite—muscovite geobarometer. Contr. Mineral. and Petrol. 96, 519–522 (1987). https://doi.org/10.1007/BF01166696
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DOI: https://doi.org/10.1007/BF01166696