Middle Eastern Alpine
As Middle East Alpin or lower Zentralostalpin geologists denote that part of the Austroalpine ceiling system , which by horizontal thrusts in the development of Alpine between the layers of the Oberostalpinen crystalline complex (mainly central Alps) and the Austroalpine fell (mainly Err and Bernina the Eastern, Semmering region).
The bulging of the Eastern Alps was not created by overfolding or folding , but by shearing off their base ( shear blankets ). The area of origin of the Central Eastern Alpine Crystalline and the Upper Eastern Alpine lying on it is far to the south; the estimates range from about 100 to 200 km. Both units belong to the crustal plate advancing from the south , which led to the large-scale subduction of the then ( Penninic ) ocean floor ( Penninic Ocean ) and the formation of the Alps.
The Middle Eastern Alps can be divided into:
- Central Eastern Alpine (polymetamorphic) basement mountains - that is, for example, the main mass of crystalline in the Ötztal Alps , Niederen Tauern , Lavanttal Alps , or the Bacher Mountains
- Middle Eastern Alpine overburden - isolated remnants, for example in the Engadine Dolomites or in the Seckau Alps at the Liesingtal with a diverse geology
Under the Middle East Alpine today in three major tectonic windows that Penninic the Western Alps exposed: In the Engadine and Tauernfenster and in Rechnitz window on Alpenostrand. In between are the more or less scuffed ceilings of the Lower Eastern Alps.
The concept of the Middle East Alpine goes back to Tollmann . The newer structural geology also uses Central Eastern Alpine , with the Upper Central Eastern Alpine including units such as the northern Grauwackenzone , the Graz Paleozoic and the Gurktal Nappe . The entire Central Eastern Alps are understood as part of the Upper Eastern Alps, and the Bajuvarikum of the Northern Limestone Alps as part of the Upper Central Eastern Alps , the Tirolean as part of the Lower Central Eastern Alps, because the Limestone Alps form a common tectonic layer with the Middle Eastern Alpine in the Tollman sense. This reorganization is currently under discussion.
See also
Individual evidence
- ↑ Clear short presentation in: Geologie der Steiermark: 1 The share of the Eastern Alps. Association of Styrian Mineral and Fossil Collectors (vstm.at), accessed August 10, 2016.
- ↑ a b Nikolaus Froitzheim: Geology of the Alps Part 1: General and Eastern Alps. Lecture script , in: Rheinische Friedrich-Wilhelms-Universität Bonn: Structural Geology (online, uni-bonn.de, accessed August 10, 2016).
- ↑ a b F.K. Bauer, R. Oberhauser: The geological structure of Austria. Springer-Verlag, 2013, ISBN 9783709137444 , 2.4.3. The Grauwackenzone and its equivalents in the central Alps in connection with overlying remains from the Mesozoic and Eocene. P. 80 ff ( limited preview in Google Book search).