Urseren–Garvera-Zone

Darstellung und Status

Index

UG / UGZ

Farbe CMYK

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

Farbe RGB

R: 241 G: 239 B: 237

Rang

tektonische Zone

Gebrauch

Element ist in Gebrauch

Status

gültig

Nomenklatur

Deutsch

Urseren–Garvera-Zone

Français

zone d'Urseren–Garvera

Italiano

zona di Urseren–Garvera

English

Urseren–Garvera zone

Herkunft des Namens

Urseren (UR) und Garvera (GR)

Historische Varianten

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)

Beschreibung

Beschreibung

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

Mächtigkeit

Ca. 500 m (Bonanomi et al. 1992)

Hierarchie und Abfolge

Untergeordnete Einheiten

• Urseren-Zone
• Garvera-Zone

Alter

Alter Top

• Jura

Alter Basis

• Karbon

Geografie

Geographische Verbreitung

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

Paläogeografie und Tektonik

Herkunftstyp

• sedimentär

Metamorphose

monozyklisch

Referenzen

Neubearbeitung

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.