Zona del Canavese
Retour à Zone du CanaveseReprésentation et statut
- Index
- Ca
- Couleur CMYK
- N/A
- Couleur RGB
- R: 241 G: 239 B: 237
- Rang
- zone tectonique
- Usage
- Ce terme est en usage.
- Status
- valide
Nomenclature
- Deutsch
- Canavese-Zone
- Français
- Zone du Canavese
- Italiano
- Zona del Canavese
- English
- Canavese Zone
- Origine du nom
-
Canavese (Italia), N Ivrea / Piemonte
- Variantes historiques
-
zone du Canavese (Argand 1909a/b, Argand 1911b), zone du Canavèse [sic] (Henny 1918, Debelmas 1976), Elemento tectonico del Canavese (Hermann 1937), Zone des Canavese (Walter 1950, Kobe 1956), Roches du Canavese (Steck & Tièches 1976), Canavese Zone (Zingg et al. 1976, Biino & Compagnoni 1989, Borghi et al. 1996, Berger & Mercolli 2007), geosinclinale del Canavese = Zona del Canavese (Dal Piaz et al. 1992a), Canavese unit = Canavese metasediments (Babist et al. 2006), zone du Canavais [traduction littérale], Canavese Zone = Canavese-Zone = Zone du Canavese (TK500 / Gouffon et al. 2024)
Description
- Description
-
Zone mylonitique composée de diverses écailles de gneiss et de calcschistes gris, formant une cicatrice majeure entre Alpes méridionales (Sesia-Lanzo) et domaine ligure (Ivrea-Verbano). Des roches volcaniques et tuffites permiennes, ainsi que des sédiments mésozoïques y sont également rattachés.
"Feinkörnige Glimmergneise und -schiefer, Tonschiefer, dunkle Kalke, Marmore, Alkalifeldspatgneise und ophiolithartige basische Intrusionen" (Walter 1950 S.5) ; narrow Mesozoic intracontinental basin (Compagnoni et al. 1977)
La Zona del Canavese è una ristretta fascia di crosta continentale superiore che, delimitata da contatti tettonici, si interpone localmente tra la Zona Sesia-Lanzo e la terminazione SW della Zona Ivrea-Verbano. Essa si estende per circa 33 km dai dintorni di Levone alla zona di Biò e Montalto Dora ed è costituita da un basamento metamorfico pre-westfaliano di prevalente basso grado, da rocce eruttive post-varisiche a carattere bimodale (gabbri, graniti e vulcaniti acide), da depositi clastici tardo-paleozoici e da sedimenti di copertura di età triassico-cretacica. (Dal Piaz et al. 1992a p.56)
Composants
- albite
- quartz
- Séricite
Hiérarchie et succession
- Unités hiérarchiquement subordonnées
- Limite supérieure
-
falda di Sesia al NW (linea esterna del Canavese = linea insubrica)
- Limite inférieure
-
zona d'Ivrea al SE (linea interna del Canavese)
Géographie
- Extension géographique
- Alpi occidentali interni: Lanzo - Biella (Canavese s.str. entre Levone et Ceresito) et Biella - Locarno (difficilement distinguable de la zone de Sesia).
Paléogéographie et tectonique
- Paléogéographie
-
marge continentale adriatique
:
southern continental margin / platform
- Termes génériques
- Type de protolithe
-
- tectonique
- Métamorphisme
- polycyclique
- Faciès métamorphique
-
- faciès à schistes verts (épizone)
- faciès à Prehnite-Pumpellyite (anchizone)
- Remarque sur le métamorphisme
-
low-grade metamorphic zone
Références
- Révision
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.105: The Canavese Zone consists of individual slivers of basement and Mesozoic sedimentary cover rocks trapped along the Internal and the External Canavese faults between the Ivrea-Ceneri Complex in the southeast and the Sesia Nappe in the northwest, dismembered by Alpine shear zones and brittle faults. It extends from the area west of Ivrea (south of the map border) to Locarno where it is truncated by a fault that links the Centovalli Fault to the Tonale Fault. It includes migmatitic and leucogranitic basement rocks with inclusions of mafic granulites similar to those of the Ivrea Zone, and amphibolite-facies basement rocks with granitic intrusions similar to those of the Strona-Ceneri Zone. The lower and upper crustal and sparse mantle rocks were presumably juxtaposed along one or more Mesozoic detachment faults. The Mesozoic sedimentary cover can be compared to that of the Lower Austroalpine Err Nappe Complex in Graubünden and is interpreted as part of the distal Adriatic margin (Ferrando et al. 2004). Alpine metamorphism is of prehnite-pumpellyite-actinolite facies (anchizone to weak epizone). Northeast of the Canavese area, i. e., over a large part of their map extent, basement and sediments of the Canavese Zone are intensely mylonitized and part of the Insubric greenschist-facies mylonite belt separating the Sesia Nappe from the Ivrea-Ceneri Complex.