Urseren–Garvera-Zone

Représentation et statut

Index

UG / UGZ

Couleur CMYK

(0%,1%,2%,5%)

Couleur RGB

R: 241 G: 239 B: 237

Rang

zone tectonique

Usage

Ce terme est en usage.

Status

valide

Nomenclature

Deutsch

Urseren–Garvera-Zone

Français

zone d'Urseren–Garvera

Italiano

zona di Urseren–Garvera

English

Urseren–Garvera zone

Origine du nom

Urseren (UR) und Garvera (GR)

Variantes historiques

Urseren-Garvera sedimentary zone, Conca Orsera-Garvera (Godenzi 1963), Garvera-Urseren-Furka-Zone = Urseren-Zone (Spicher 1980, Oberholzer 1986), nördliche Sedimenthülle = Urseren-Garvera-Zone (Bonanomi et al.1992), Urseren-Garvera Zone (Berger et al. 2017)

Description

Description

Postvariszische metamorphe autochtone und parautochtone Sedimentbedeckung (Permo-Karbon, Trias und Jura) am Nordrand der Gotthard-Decke.

Épaisseur

Ca. 500 m (Bonanomi et al. 1992)

Hiérarchie et succession

Unités hiérarchiquement subordonnées

• Urseren-Zone
• Garvera-Zone

Âge

Âge au sommet

• Jurassique

Âge à la base

• Carbonifère

Géographie

Extension géographique

Schmaller Sedimentzug welcher Aar-Massiv und Gotthard-Decke zwischen Grengiols und Ilanz trennt.

Paléogéographie et tectonique

Type de protolithe

• sédimentaire

Métamorphisme

monocyclique

Références

Révision

Berger Alfons, Mercolli Ivan, Herwegh Marco, Gnos Edwin (2017) : Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129

p.76: The Urseren-Garvera Zone consists of a sequence of Carboniferous–Jurassic metasedimentary rocks and straddles the northern boundary of the Gotthard Nappe. A complete stratigraphic sequence is not preserved everywhere between Brig and Val Medel. Consequently, different segments of the Urseren-Garvera Zone have local names, i.e., Urseren Zone, Garvera Zone and Furka Zone.
In the western Goms area (between Brig and Blitzingen) only Carboniferous–Permian metasedimentary sequences are preserved (OBERHOLZER 1955). Between Ulrichen and Andermatt, Carboniferous–Permian to Late Jurassic sedimentary rocks of the Urseren-Garvera Zone outcrop in a relatively undisturbed stratigraphic order (Fig.14, WYSS 1985). In this region, the metasedimentary sequence is steeply north-dipping and younging towards the north. The most complete stratigraphic section is preserved between Ulrichen and Realp, while in the western Goms area and in the Urserental essentially Carboniferous– Permian metasedimentary rocks and some Triassic and Jurassic relics occur (OBERHOLZER 1955, WYSS 1985). In the east between the Oberalppass and Garvera, strong internal deformation is observed.