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Journal of Petrology Advance Access originally published online on June 3, 2005
Journal of Petrology 2005 46(10):2129-2144; doi:10.1093/petrology/egi050
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

A Quaternary Solution Model for White Micas Based on Natural Coexisting Phengite–Paragonite Pairs

L. M. KELLER*, C. DE CAPITANI and R. ABART

DEPARTMENT OF EARTH SCIENCES, BASEL UNIVERSITY, BERNOULLISTRASSE 32, CH-4056 BASEL, SWITZERLAND

RECEIVED NOVEMBER 25, 2003; ACCEPTED APRIL 12, 2005

A thermodynamic model for the quaternary white mica solid solution with end-members muscovite–Mg-celadonite–paragonite–Fe-celadonite (Ms–MgCel–Pg–FeCel) is presented. The interaction energies for the MgCel–Pg join, the FeCel–Pg join and the ternary interactions were obtained from natural coexisting phengite–paragonite pairs. Phengite–paragonite pairs were selected based on the criteria that their chemical compositions may be represented as a linear combination of the model end-member compositions and that the respective formation conditions (350–650°C, 4–21 kbar) are accurately known. Previously published excess free energy expressions were used for the Ms–Pg, Ms–MgCel and Ms–FeCel binaries. The suggested mixing model was tested by calculating multicomponent equilibrium phase diagrams. This proved to be particularly well suited to reproduce compositional variations of white micas from amphibolite-facies metapelites.

KEY WORDS: white mica; solution model; equilibrium phase diagrams

* Corresponding author. Telephone: 0041/(0) 61 267 36 31. Fax: 0041/(0) 61 267 36 13. E-mail: Lukas.Keller{at}unibas.ch


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C.-M. WU and G. ZHAO
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