Bernina-Decke

Représentation et statut

Couleur CMYK

N/A

Couleur RGB

R: 241 G: 239 B: 237

Rang

nappe

Usage

Ce terme est en usage.

Status

valide

Nomenclature

Deutsch

Bernina-Decke

Français

Nappe du (Piz) Bernina

Italiano

Falda del (Piz) Bernina

English

Bernina Nappe

Origine du nom

Piz Bernina (GR)

Variantes historiques

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.

Hiérarchie et succession

Unités hiérarchiquement subordonnées

• Alv-Mulde
• Sassalbo-Zone

Paléogéographie et tectonique

Termes génériques

• Bernina

Type de protolithe

• tectonique

Références

Révision

Gouffon Yves (Editor) (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.