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A two-parameter Margules method for modelling the thermodynamic mixing properties of albite-water melts

Published online by Cambridge University Press:  03 November 2011

James G. Blencoe
James G. Blencoe
Affiliation:
James G. Blencoe, Geosciences Group, Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6110, U.S.A.
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Abstract

A two-parameter Margules method has been developed for modelling the thermodynamic mixing properties and hypersolidus phase relations of albite-water (ab-w) melts. The method is based largely on phase-equilibrium and calorimetric data that are either currently available or readily obtainable; P-V-T data are not required.

The new modelling method has been applied to calculate: (1) thermodynamic mixing properties for ab-w melts at 2-5 kbar, 815°C; and (2) hypersolidus phase relations for the ab-w system at 2·5 kbar. Results are uniformly positive—activity-composition relations are similar to those predicted by equations based on P-V-T data, excess enthalpies are in good agreement with data obtained from calorimetry, and calculated phase relations are fully compatible with phase-equilibrium data for ab-w melts acquired at 2·5 kbar.

It is concluded that the Margules method for thermodynamic modelling of ab-w melts is a practical alternative to the P-V-T modelling method.

Keywords

igneous petrologygranitemagmassilicate meltsthermodynamicsalbitewater
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 83 , Issue 1-2: Second Hutton Symposium: The Origin of Granites and Related Rocks , 1992 , pp. 423 - 428
Copyright
Copyright © Royal Society of Edinburgh 1992

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