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A ternary feldspar-mixing model based on calorimetric data: development and application

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Abstract

A mixing model for high structural state ternary feldspars in the NaAlSi3O8–KAlSi3O8–CaAl2Si2O8 system is presented based exclusively on calorimetric and volumetric measurements. Comparisons with existing mixing models, which are based on phase-equilibrium experiments, reveal distinct differences. The incorporation of K into Ca-rich plagioclase and of Ca into K-rich alkali feldspar is more strongly limited by our calorimetry-based model, whereas the stability field of Na-rich feldspars is broadened. Natural feldspar assemblages from well-studied magmatic and high-grade metamorphic rocks (i.e. a teschenite sill in Scotland, the Klokken syenogabbro in Greenland, and a granulite-facies metapelite in Sri Lanka) were used to test the mixing models. It was found that the new model largely eliminates discrepancies between observed and predicted feldspar compositions that were present in earlier attempts. The reasons for the problems associated with phase-equilibrium based mixing models are discussed.

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Acknowledgments

This work was supported by a grant from the Austrian Science Fund, project number P 20210-N10, which is gratefully acknowledged. We thank N. S. Rahmoun, Kiel, for collecting the IR spectra and P. Raase, Kiel, for providing the thin sections and for valuable discussions. We also thank R. Abart, Wien, for his valuable contributions. The manuscript benefited much from a careful and constructive review by I. Parsons, Edinburgh.

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  1. Fachbereich Materialforschung und Physik, Universität Salzburg, Hellbrunnerstr. 34, 5020, Salzburg, Austria

    Artur Benisek & Edgar Dachs

  2. Institut für Mineralogie, Westfälische Wilhelms-Universität, Corrensstr. 24, 48149, Münster, Germany

    Herbert Kroll

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  1. Artur Benisek
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  2. Edgar Dachs
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Correspondence to Artur Benisek.

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Communicated by J. Hoefs.

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Benisek, A., Dachs, E. & Kroll, H. A ternary feldspar-mixing model based on calorimetric data: development and application. Contrib Mineral Petrol 160, 327–337 (2010). https://doi.org/10.1007/s00410-009-0480-8

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