Abstract
The join tremolite (Tr)-pargasite (Pa) has been studied in the temperature range 750 °–1,150 ° C under a water vapor pressure of 1 and 5 kbar. There is a continuous solid solution series between the compositions Tr85Pa15 and TroPa100 at 850 ° C and 5 kbar. Tremolite and pargasite are separated by a solvus at 1 kbar and the field of tremolitic amphibole +pargasitic amphibole+vapor is present in the region between Tr90Pa10 and Tr10Pa90 at 800 ° C. The phase assemblages at 850 ° C and 1 kbar change as follows with increasing pargasite component; clinopyroxene +orthopyroxene+quartz+vapor, tremolitic amphibole+vapor, tremolitic amphibole+clinopyroxene +forsterite+plagioclase+vapor, tremolitic amphibole+pargasitic amphibole+vapor, and pargasitic amphibole+vapor. The petrological significance of amphibole pairs in metamorphic rocks is discussed on the basis of the experimental results.
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Oba, T. Phase relations in the tremolite-pargasite join. Contr. Mineral. and Petrol. 71, 247–256 (1980). https://doi.org/10.1007/BF00371666
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DOI: https://doi.org/10.1007/BF00371666