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Melting experiments with plagioclases were performed in the systems Ab–An, Ab–An–H2O, Qz–Ab–An–H2O, and Qz–Or–Ab–An–H2O–CO2. The experimental products were analysed by electron microprobe, and the kinetics of the reactions were studied qualitatively.

Melting of the plagioclase in the system Ab–An (P = 1 atm, T = 1420°C) is very fast in the first minutes but becomes slower with increasing run duration and is incomplete even after 1000 hours. The Ab/An fractionation between melt and residual plagioclase is similar to that described by Bowen (1913).

Melting kinetics of plagioclase in the system Ab–An–H...

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