Bittescher gneiss
Bittescher Gneiss is a granite gneiss created by metamorphosis .
The Bittescher gneiss is light, heavily slate, fine to medium-grained, has a platy formation and is characterized by longitudinal welts on the layer surfaces. It is named after the Czech town of Groß Bittesch , where it was first described by Franz Eduard Suess .
Emergence
About 800 million years ago, according to recent studies 580 million years ago, magma penetrated from the earth's interior into the earth's crust and there slowly solidified to granite . During the Varizsian orogeny about 340 million years ago, this granite was metamorphically formed under high pressure (approx. 8 kilobar) and high temperatures (approx. 700 ° C), whereby its mineral components were arranged in slate welts and rolled out in a flat-banked manner . Whitish inclusions of feldspar of up to 2 cm in size are common, often with light mica . As a result, the gneiss was slowly exposed by uplift and erosion processes.
Occurrence
With its mighty and extensive deposits, the Bittescher Gneiss forms a distinctive and easily traceable rock series of the eastern Moravian .
Dismantling and use
Bittescher gneiss is quarried in numerous quarries such as around Klein-Meiseldorf . It is hard and popular as a stepping stone and decorative stone (in the garden) because of its flat formation.
literature
- Gerhard Fuchs and Alois Matura: On the geology of the crystalline of the southern Bohemian mass , yearbook of the Federal Geological Institute, volume. 119, Vienna 1976
Individual evidence
- ↑ Susanna Scharbert (1977), quoted by Alois Matura in Rudolf Oberhauser (ed.) : Der Geologische Aufbau Österreichs , Springer-Verlag , 2013, p. 132.
- ↑ G. Friedl, F. Finger, JL Paquette et al. (2004), cited in Martin Lindner: Geochemical characterization of Spitzer and Dobra Gneiss in the Waldviertel Moldanubic , diploma thesis, Salzburg, 2016; P. 13
- ↑ Krahuletz Museum, permanent exhibition rocks . Retrieved April 25, 2019