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Journal of Petrology Advance Access published online on June 3, 2005
Journal of Petrology, 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@oupjournals.org
Received November 25, 2003
Accepted April 12, 2005

Article

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

L. M. KELLER 1*, C. DE CAPITANI 1, and R. ABART 1

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

* To whom correspondence should be addressed.
L. M. KELLER, E-mail: Lukas.Keller{at}unibas.ch


  Abstract

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.

Keywords: white mica; solution model; equilibrium phase diagrams.
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[Abstract] [Full Text] [PDF]


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