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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Mineralogy and petrology 14 (1970), S. 141-153 
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Summary Chess-board oligoclase (Ab83An17) was found in gneisses of a low-grade amphibolite facies zone of the Zillertaler Alps (Tyrol, Austria). This plagioclase was formed by metasomatic replacement of premetamorphic potassium feldspar by oligoclase. The replacement process can be represented by the following reaction: $$\begin{gathered} 1,17KAlSi_3 O_8 + 0,17Ca^{2 + } + 0,83Na^ + \to \hfill \\ \to (0,17CaAl_2 Si_2 O_8 /0,83NaAlSi_3 O_8 ) + 0,68SiO_2 + 1,17K^ + \hfill \\ \end{gathered} $$ The validity of the above reaction was confirmed by results of modal analysis from thin sections. Optical and X-ray data of the chess-board oligoclase correspond to those observed in ordered oligoclase (Ab83An17).
    Notes: Zusammenfassung Schachbrettoligoklas (Ab83An17) wurde erstmals in alpidisch metamorphen Gneisen der Zillertaler Alpen (Tirol, Österreich) gefunden. Er entstand durch metasomatische Verdrängungen von prämetamorphem Kalifeldspat I durch Oligoklas ausschließlich im Bereich der niedrig temperierten Amphibolitfazies (B 2.1 nachWinkler, 1967) gemäß der Reaktionsgleichung: $$\begin{gathered} 1,17KAlSi_3 O_8 + 0,17Ca^{2 + } + 0,83Na^ + \to \hfill \\ \to (0,17CaAl_2 Si_2 O_8 /0,83NaAlSi_3 O_8 ) + 0,68SiO_2 + 1,17K^ + \hfill \\ \end{gathered} $$ Die Gültigkeit dieser Reaktionsgleichung ist durch die Integration des Schachbrettoligoklases und seiner amöboiden Quarz-Einschlüsse in Dünnschliffen bestätigt worden. Schachbrettoligoklas entspricht in seinen optischen und röntgenographischen Daten maximal geordnetem Oligoklas (Ab83An17).
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1970-01-01
    Print ISSN: 0041-3763
    Electronic ISSN: 1438-1168
    Topics: Geosciences
    Published by Springer
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