Austroalpine nappes
Geological formation in the European Alps / From Wikipedia, the free encyclopedia
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The Austroalpine nappes are a geological nappe stack in the European Alps. The Alps contain three such stacks, of which the Austroalpine nappes are structurally on top of the other two (meaning they were thrust over the other two). The name Austroalpine means Southern Alpine, because these nappes crop out mainly in the Eastern Alps (the Alps east of the line Lake Constance - Chur – Lake Como).
Because the Austroalpine nappes consist of material from the former Apulian or Adriatic plate, that was thrust over the European plate, they are called allochthon nappes. In comparison with the other nappe stacks, they have experienced lower-grade metamorphism, which distinguishes them clearly from the Penninic nappes on which they rest.