Falda della Sella
Representation and status
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- nappe
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Sella-Decke
- Français
- Nappe de la Sella
- Italiano
- Falda della Sella
- English
- Sella Nappe
- Origin of the Name
- Historical Variants
-
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)
Description
- Description
-
typische blaugrauen Granite ("Banatite") und Monzonite
Hierarchy and sequence
- Upper boundary
-
Platta-Ophiolithe bzw. Corvatsch-Teildecke (via Coaz-Mulde)
- Lower boundary
-
Fex-Schuppenzone, Tremoggia-Mulde
Geography
- Geographical extent
- Keilt bei Torre di Santa Maria (Valmalenco), in der Steilzone nördlich der Tonale-Linie, zwischen Bernina- und Margna-Decke aus (Venzo et al. 1971).
Palaenography and tectonic
- Paleogeography
-
Adriatic continental margin
:
southern, passive continental margin / platform
- Tectonic unit (resp. main category)
References
- Definition
-
(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.