Phase relations in the tremolite-pargasite join |
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| Authors: | Takanobu Oba |
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| Institution: | (1) Department of Geology and Mineralogy, Faculty of Science, Hokkaido University, 060 Sapporo, Japan |
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| 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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