RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA
Abstract
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.
