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Theory of Immiscibility in Mineral Systems

Published online by Cambridge University Press:  14 March 2018

Robert F. Mueller
Robert F. Mueller*
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago 37, Illinois
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Summary

The theoretical basis for the stability of binary and quasi-binary solutions is discussed with special emphasis on miscibility relations. Solutions of the distribution equations are presented for the case of two and three coexisting regular solutions and this model is used to illustrate the energetics of miscibility relations. The same principles are then extended to give a qualitative interpretation to sequences of mineral assemblages consisting of pyroxenes, amphiboles, micas, and feldspars. A formulation is presented for the intrinsic stability of a solution, which depends on the presence or absence of an excess free energy of mixing, and the extrinsic stability of a solution, which depends on the standard free energy of the component end members.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 266 , September 1964 , pp. 1015 - 1023
Copyright
Copyright © 1964, The Mineralogical Society

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