Abstract
Knowledge about the stability of the association of chloritoid + quartz is of greater petrological significance than that about the stability of chloritoid on its own. The results of a series of experiments are described which define an upper breakdown temperature for this association at 1,000 bars water pressure. To obtain data on this sluggish reaction use was made of the single-crystal techniques introduced by Fyfe and Hollander (1964). Since no unambiguous reversal of the reaction at the breakdown-temperature of 445° at 1,000 atm H 2O-pressure can be proved, this must be considered to be an upper temperature limit only for the association of chloritoid + quartz at these rather modest water-pressures.
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