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Mineralogical Magazine; February 2001; v. 65; no. 1; p. 1-31
© 2001 Mineralogical Society of Great Britain and Ireland
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Structural discontinuities in plagioclase and constraints on mixing properties of the low series: a computational study

V. L. Vinograd*, A. Putnis and H. Kroll

Institute of Mineralogy, Münster University, D-48149, Münster, Germany

* E-mail: vinogra{at}uni-muenster.de

Subsolidus phase relations in the plagioclase system are investigated using an Ising-type model. The model treats ordering of Al,Si and Na,Ca cations in three dimensions using a version of the cluster variation method. The interactions within the T (Al,Si) and M (Na,Ca) sublattices and the interactions between the T and M sublattices are constrained by the available experimental information on order-disorder transitions in the system. The paper suggests a thermodynamic explanation for the existence of two distinct structural series (high and low) and gives constraints on the thermodynamics of low plagioclases.

KEYWORDS: plagioclase, subsolidus phase relations, structural series, thermodynamics




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