Abstract
The viscosities of supercooled melts of 13 different plagioclase compositions have been measured in the range 1013–108 dPas with a micro-penetration viscometer. Application of the most common empirical and theoretical viscosity-temperature models to the present data and plagioclase viscosity data available from the literature showed that the configurational entropy theory represents the best approach. Using this theory together with an entropy of mixing term evaluated from a modified “two-lattice” mixing model, the viscosities of intermediate plagioclase compositions have been calculated as a function of temperature and anorthite content solely from the appropriate data of the end members albite and anorthite. The agreement between experimental and calculated viscosity data is excellent.
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Dedicated to Professor Wolf von Engelhardt on the occasion of his 75th birthday
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Hummel, W., Arndt, J. Variation of viscosity with temperature and composition in the plagioclase system. Contr. Mineral. and Petrol. 90, 83–92 (1985). https://doi.org/10.1007/BF00373044
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DOI: https://doi.org/10.1007/BF00373044