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Fig. 17 | Swiss Journal of Geosciences

Fig. 17

From: The Arosa zone in Eastern Switzerland: oceanic, sedimentary burial, accretional and orogenic very low- to low grade patterns in a tectono-metamorphic mélange

Fig. 17

Tectono-metamorphic model during D3 deformation. In the Oberhalbstein the nappe stack and the metamorphic zones are folded. In the Mittelbünden area the Austroalpine nappe stack is partly re-coalified by the second metamorphism, but thrusted without major deformation of the second metamorphic pattern on the Arosa zone. The second metamorphism is characterized by a metamorphic inversion to the Arosa zone. In the Arosa zone, Austroalpine fragments dismembered during D3 show an inherited transported metamorphism. After ceasing of the mélange formation the matrix of the mélange was overprinted by a third thermal event. The last event was the result of thermal re-equilibration after D3 thrusting and crustal thickening

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