Analisi in profondità di strutture mesoalpine e neoalpine nelle Alpi Meridionali orientali

To better analyse the superimposition between structures of mesoalpine (1-NE-SW) and neoalpine (1 from N-S to NW-SE) phases and to study the complex system of reactivations, some deep geologic sections have been realized. Five sections are about N-S or NW-SE oriented, they cut the principal neoalpine structures; two of them are remakes from already published sections (Carulli & Ponton,1992 e Merlini et alii, 2002). A long section SW-NE cuts orthogonally the others sections and the mesoalpine structures. So we can reconstruct a more correct reasoned scheme of this part of South-alpine orogenic belt. For the first time the deep interaction between orthogonally fault planes and their three-dimensional wideness has been analyzed. It is clear, for all the principal structures, the basement involvement and the common decollement horizons in the Permian and Carnian evaporitic units. Mesoalpine frontal ramps became lateral or oblique in the first successive phases and then they are cut and translate. In this work only one section is presented, the Pontebba-Bernadia well- Tricesimo, modified from Merlini et alii (2002) where are represented the principal structures: Val Dogna and M. S. Simeone lines, mesoalpine in origin, are folded from the neoalpine anticline ramp, while the Bernadia line is cut from the neoalpine plane and the Cividale line is partly a reactivation of the mesoalpine plane.