Zona di Orselina-Bellinzona
Representation and status
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic zone
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Orselina-Bellinzona-Zone
- Français
- Zone d'Orselina-Bellinzona
- Italiano
- Zona di Orselina-Bellinzona
- English
- Orselina-Bellinzona Zone
- Historical Variants
-
Orselina-Bellinzona Zone (Gouffon et al. 2024)
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- tectonic
- Metamorphism
- metamorphic
References
- Definition
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.49: The Orselina-Bellinzona Zone is continuous between the Valle d’Ossola and Bellinzona, located between the Antigorio Nappe and the Centovalli Fault west of Locarno and between the Mergoscia Zone and the Tonale Fault further east. The Orselina-Bellinzona Zone is lithologically similar to the Isorno Zone. Steck et al. (1999, 2001, 2013) see a continuity from one to the other unit on both sides of the Masera Synform near Domodossola, whereas other geologists do not see any structural connection between these two units (pers. comm. S. M. Schmid, N. Mancktelow, T. Burri). To the east of Bellinzona, the Orselina-Bellinzona Zone may include the extension of the Mergoscia Zone (see § 5.1), which has not been distinguished in this area by the authors. As the Mergoscia Zone is also a mélange zone, the only criterion of distinction between these two units is the presence of eclogitic relics in the Mergoscia Zone (Steck et al. 2013 and ref. therein).