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Journal of the Geological Society; August 1983; v. 140; no. 4; p. 629-633; DOI: 10.1144/gsjgs.140.4.0629
© 1983 Geological Society of London
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Article

Fluids and melting under upper amphibolite facies conditions

R. Powell

Internal buffering paths on temperature-water activity diagrams for the pelitic model system:

NaAIO2 - KAIO2 - CaAI2O4 - Al2SiO5 - SiO2 - H2O

give rise to sequences of assemblages which correspond to those observed in upper amphibolite facies terranes. In particular, the persistence of the assemblage quartz-alkali feldspar-plagioclase-muscovite-sillimanite across a zone and the rapidly changing composition of plagioclase across this zone can be accounted for in a natural way.




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