Coexisting phengite,paragonite and margarite in metasediments of the mittlere Hohe Tauern,Austria |
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| Authors: | Volker Höck |
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| Institution: | 1. Institut für Mineralogie, Bochum
2. Institut für Geologie, Universit?t Salzburg, Akademiestra?e 26, A-5020, Salzburg, Austria
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| Abstract: | The assemblages phengite-paragonite, phengite-margarite and phengite-paragonitemargarite are very common in metasediments of a N-S profile in the middle sector of the Hohe Tauern. The Si4+-content of phengite shows no regular change with increasing temperature from north to south along the profile. The variations in the d 002 basal spacings of phengite coexisting with paragonite are not only dependent on the Na+ content of phengite but also on the Mg2++Fe2+ content of the micas. Neither the sodium content in phengite nor the potassium content in paragonite shows any dependence on temperature. Chemical analyses of coexisting phengite, paragonite and margarite give the extent of the three-phase-region which is characterized by a small amount of margarite in paragonite (4 Mol%), by a large quantity of Na+ in margarite (28 Mol% paragonite), and limited miscibility between phengite and paragonite. |
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