An example of occurence and breakdown of paragonite |
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| Authors: | F Purtscheller S Hoernes G C Brown |
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| Institution: | (1) Innsbruck University, Innsbruck, Austria;(2) Manchester University, Manchester, UK;(3) Present address: Sub-Dept. of Geophysics, University of Liverpool, UK |
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| Abstract: | Paragonite occurs in pelitic schists and amphibole schists of the Ötztal Alps (Tyrol); its occurence in amphibole schists is controlled by the Na2O/K2O, in pelitic schists by the local fabric. Some analysis of the bulk chemistry of the paragonite bearing rocks and one microprobe analysis of paragonite are given. Paragonite is stable together with muscovite, together with quartz it is unstable. Its breakdown can be described by the reaction: paragonite+quartz kyanite+albite+H2O. The age of this breakdown is discussed by comparison of experimental, field and radiometric data, it is thought to be of Variscian age. |
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