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Structural discontinuities in plagioclase and constraints on mixing properties of the low series: a computational study

Published online by Cambridge University Press:  05 July 2018

V. L. Vinograd ,
A. Putnis  and
H. Kroll
V. L. Vinograd*
Affiliation:
Institute of Mineralogy, Münster University, D-48149, Münster, Germany
A. Putnis
Affiliation:
Institute of Mineralogy, Münster University, D-48149, Münster, Germany
H. Kroll
Affiliation:
Institute of Mineralogy, Münster University, D-48149, Münster, Germany
*
*E-mail: vinogra@uni-muenster.de
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Abstract

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 orderdisorder 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

plagioclasesubsolidus phase relationsstructural seriesthermodynamics
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 1 , February 2001 , pp. 1 - 31
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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