http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29333
Brittle post-metamorphic tectonics in the Gran Paradiso Massif (north-western Italian Alps). (Articolo in rivista)
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- Label
- Brittle post-metamorphic tectonics in the Gran Paradiso Massif (north-western Italian Alps). (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
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- Perello P.; Delle Piane L.; Piana F.; Stella F.; Damiano A. (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- IGG - Sezione di Torino (literal)
- Titolo
- Brittle post-metamorphic tectonics in the Gran Paradiso Massif (north-western Italian Alps). (literal)
- Abstract
- New geological mapping (1:10.000 scale) and structural analysis in the Orco valley (NW Italian Alps), give insights on the post-meta- morphic brittle tectonic evolution of the Gran Paradiso Unit and adjoining Piemonte Ophiolitic Unit and Sesia-Lanzo Unit. According to existing geochronological data, the metamorphic evolution of the studied domain ended in Early Oligocene and was followed by a progressive exhumation during Neogene. This work describes the brittle fault network developed during the post-metamorphic tectonic stages coeval to exhumation. The geometry and kinematics of this fault network allow to interpret the study area as a part of a larger low- strain, fault-bounded block, whose main bordering discontinuities are located outside the mapped region. The post-metamorphic kine- matic evolution was characterised by: (a) ESE-WNW extension, attested by NNE-SSW normal faults and extensional joints; (b) dextral shearing along a major E-W shear zone (Orco shear zone). The individual faults of the studied area are considered as P- or R-shears of the Orco shear zone, which could be in turn a part of a larger NE-SW regional shear zone bounded to the N by the Chamonix-Rho?ne- Simplon Line. (literal)
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