In the Maurienne valley, the post-metamorphic evolution is composed by two tectonic phases. The first one occurs between 32 and 22 Ma and is related to N-S direction of extension and vertical to E-W direction of shortening. The second tectonic phase occurred between 6-5 Ma and the present. It is related to E-W direction of extension and vertical to N-S direction of shortening. This post metamorphic evolution occurs after the normal motion of a major fault that forms the western limit of the ICM. Basement domes observed in the ICM and in the Briançonnais are the results of interference between an early E-W extension and the two brittle tectonic events documented here.
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