Bernina-Decke
Back to Bernina NappeRepresentation 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
- Bernina-Decke
- Français
- Nappe du (Piz) Bernina
- Italiano
- Falda del (Piz) Bernina
- English
- Bernina Nappe
- Origin of the Name
- Historical Variants
-
Berninadecke (Cornelius 1923), Falda di Bernina (Pozzi 1959), falda Bernina (Godenzi 1963), Bernina basement nappe (Manatschal & Nievergelt 1997), Bernina Nappe (TK500 / Gouffon et al. 2024)
Description
- Description
-
Unterostalpine Kristallindecke.
Hierarchy and sequence
- Subordinate units
References
- Definition
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.86: The Bernina Nappe is a basement-dominated nappe that occupies a very large area southeast of the Engadine Fault. The basement is dominated by Late to Post-Variscan magmatic rocks, which intrude an older basement of presumably Precambrian age with Variscan overprint that is mainly preserved in the northern part of the nappe (Spillmann 1993, Büchi 1994, Spillmann & Trommsdorff 2007). Its Mesozoic cover is rather sparsely preserved, except for two important and famous occurrences, one around Piz Alv, north of the Bernina Pass, in the footwall of the Languard Nappe, and the other at the Sassalb, east of Poschiavo, in the footwall of the Campo Nappe (Mohn et al. 2012). The Bernina Nappe lacks a clear separation from the underlying Sella Nappe (Spillm ann 1993), which is attributed to the Salassic (see chap. 7). South of Poschiavo, the Bernina Nappe is folded around the E-plunging Pass d’Ur Antiform and can be followed westward along the Southern Steep Belt north of the Tonale Fault, until being cut off by the Bregaglia Intrusion.
-
Alv-Mulde
- Name Origin
-
Piz Alv (GR), NE Berninapass
- Rank
- tectonically bounded lithostratigraphic unit
- Status
- valid
- In short
- Teildeckentrenner (westvergente liegende Synklinale) zwischen Bernina-Decke s.s. und Stretta-Teildecke bzw. Languard-Decke.
-
Alv-Brekzie
- Name Origin
-
Costa Piz Alv (GR), Val Bernina
- Rank
- lithostratigraphic Member (Subformation)
- Status
- informal term
- Nomenclatorial Remarks
- <p>Steinsberger Brekzie (Schiller 1904), roter Liaskalk (Zoeppritz 1906), Liasbrekzie (Spitz & Dyhrenfurth 1914), Steinsbergerbreccie (Eugster ----), Lias rosso (Pozzi 1959), Liasbreccie (Burkard 1953, Cadisch et al. 1968), Lischana-Brekzie</p>
- In short
-
Bunte, chaotische Brekzien mit kantigen und kantengerundeten, rein karbonatischen Klasten verschiedener Grösse (mm- bis m-Bereich) in einer gelben bis roten, dolomitischen oder kalkigen Matrix. Mehrheitliche dolomitische Klasten stammen aus der Hauptdolomit-Gruppe, Klasten aus Lumachellen- und Korallenkalken hingegen aus der Kössen-Formation. Die mikritische Matrix führt lokal Fossilien (z.T. Belemniten, Ammoniten), welche dolomitisiert sein können. Teilweise treten schwache Vererzungen und braunschwarze Fe-Mn-Krusten auf.
- Age
- late Sinemurian
-
Sassalbo-Zone
- Name Origin
-
Sassalb(o) (GR) im Puschlav
- Rank
- tectonic zone
- Status
- informal term
- In short
- Mesozoische Sedimentmulde zwischen Languard- und Campo-Kristallin bzw. zwischen Bernina-Decke und Campo-Languard-Decke.