Falda di Chiavenna
Back to ChiavennaRepresentation 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
- Chiavenna-Decke
- Français
- Nappe de Chiavenna
- Italiano
- Falda di Chiavenna
- English
- Chiavenna Nappe
- Origin of the Name
- Historical Variants
-
Mafitit-Ultramafitit-Komplex zwischen Chiavenna und Val Bondasca (Schmutz 1976), zona di Chiavenna (Wenk 1992), Chiavenna unit = unità di Chiavenna (Huber & Marquer 1998, Talerico 2000)
Description
- Description
-
Tra la falda dell'Adula risp. el complesso del Gruf (in basso) e la falda del Tambo (in alto).
Hierarchy and sequence
- Units at roof
- Units at floor
Geography
- Geographical extent
- Chiavenna, Val Bondasca [kommt nur auf GA25-Blatt 070_Sciora vor].
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- tectonic
- Metamorphism
- non metamorphic
References
- Definition
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.71: The Chiavenna Nappe is a large ophiolitic slice found below the Middle Penninic Tambo Nappe and against the Gruf Complex, and thus considered as a remnant of the Valaisan oceanic crust.
p.73: The Chiavenna Nappe is a voluminous ophiolitic complex consisting of metaperidotites, amphibolites, metagabbros and rare carbonate rocks. To the south it lies tectonically “above” the Gruf Complex along a subvertical contact, to the north it is overlain by the Tambo Nappe (Schmutz 1976). The position of the Chiavenna Nappe below the Tambo Nappe, as is the case for the Tomül and Grava nappes, leads to the interpretation of this ophiolitic complex as originating from the ocean floor of the Valaisan Basin (Schmutz 1976, Schmid et al. 1996 a). This is supported by the Cretaceous age of the magmatic protoliths (Liati et al. 2003).
- Important Publications
-
(1976) : Der Mafitit-Ultramafitit-Komplex zwischen Chiavenna und Val Bondasca (Provinz Sondrio, Italien; Kt. Graubünden, Schweiz). Beitr. Geol. Karte Schweiz N.F. 149(1998) : The tectonometamorphic history of the peridotitic Chiavenna unit from Mesozoic to Tertiary tectonics: a restoration controlled by melt polarity indicators (Eastern Swiss Alps). Tectonophysics 296, 205-223(2000) : Petrological and chemical investigations of a metamorphosed oceanic crust-mantle section (Chiavenna, Bergell Alps). Diss. ETH Zürich No. 13934