Falda della Sella
Darstellung und Status
- Farbe CMYK
- N/A
- Farbe RGB
- R: 241 G: 239 B: 237
- Rang
- Decke
- Gebrauch
- Element ist in Gebrauch
- Status
- gültig
Nomenklatur
- Deutsch
- Sella-Decke
- Français
- Nappe de la Sella
- Italiano
- Falda della Sella
- English
- Sella Nappe
- Herkunft des Namens
- Historische Varianten
-
Selladecke (Staub 1934), Hochpenninikum = Sella-Decke (Staub 1946), Falda Sella (Godenzi 1963), nappe du Piz Sella (Trümpy 1970), Sella-Teildecke (Spillmann 1993, Spillmann & Trommsdorff 2007), Sella Nappe (Gouffon et al. 2024)
Beschreibung
- Beschreibung
-
typische blaugrauen Granite ("Banatite") und Monzonite
Hierarchie und Abfolge
- Obergrenze
-
Platta-Ophiolithe bzw. Corvatsch-Teildecke (via Coaz-Mulde)
- Untergrenze
-
Fex-Schuppenzone, Tremoggia-Mulde
Geografie
- Geographische Verbreitung
- Keilt bei Torre di Santa Maria (Valmalenco), in der Steilzone nördlich der Tonale-Linie, zwischen Bernina- und Margna-Decke aus (Venzo et al. 1971).
Paläogeografie und Tektonik
- Paläogeografie
-
Adriatischer Kontinentalrand
:
southern continental margin / platform
- Tektonische Einheit (bzw. Überbegriff)
Referenzen
- Neubearbeitung
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.82: The overlying Sella Nappe contains only upper crustal granitoids and paragneisses, very similar to that of the overlying Err and Bernina nappe complexes. A thin Mesozoic cover is present mainly at the front of the nappe in the northwest and from there over a few kilometers of its upper limb. As these sediments are missing further southeast, Spillmann (1993) considers the Sella Nappe as the intensely deformed lower extension of the Bernina Nappe, while Montrasio et al. (2005) treat the Sella Nappe as a separate nappe. The ophiolites of the Platta Nappe not only tectonically overlie the Margna Nappe but also the northernmost parts of the Sella Nappe. This justifies the attribution of the Sella Nappe to the Salassic domain. The rapid wedging out of the Platta Nappe towards the southeast between the Sella Nappe and the overlying Err and Bernina nappe complexes south of the Upper Engadine is attributed to top-E extension that affected the Cretaceous nappe stack after its formation during the latest Cretaceous and before Cenozoic N–S shortening (Ducan-Ela extension phase of Froitzheim et al. 1994). Mohn et al. (2011) see a prominent tectonic contact on the top of the Sella Nappe, the so-called “Lunghin-Mortirolo Movement Zone”, with contrasting degrees of deformation and metamorphism between the hangingwall and the footwall.