Internal Lower Penninic of Eastern Switzerland

Rappresentazione e statuto

Colore RGB

R: 239 G: 237 B: 235

Rango

sottodominio tettonico

Uso

Unità non usata

Status

termine locale (informale)

Nomenclatura

Deutsch

Internes Unterpenninikum der Ostschweiz

Français

Pennique Inférieur interne de Suisse orientale

Italiano

Pennidico Inferiore interno della Svizzera orientale

English

Internal Lower Penninic of Eastern Switzerland

Varianti storiche

Lower Penninic in Central and Eastern Switzerland (TK500 / Gouffon et al. 2024)

Paleogeografia e tettonica

Termini generici

• Lower Penninic

Tipo di origine

• tettonico

Metamorfismo

non metamorfo

Referenze

Revisione

Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.71: The Lower Penninic subdomain of central and eastern Switzerland is represented by flysch nappes of controversial origin in the external part of the Alps and essentially by metasedimentary, mostly shaly-calcareous units (so called “Bündnerschiefer”) further south, deposited in the oceanic Valaisan Basin. Ophiolitic remnants are found at the base of some of the “Bündnerschiefer-type” nappes. 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. Lower Penninic sediment units form the Prättigau Half-Window and the core of the Lower Engadine Window.

p.72: Mesozoic shaly-calcareous-sandy marine sedimentary units, called “Bündnerschiefer”, surround the Adula Nappe (Steinmann 1994) and other Lepontic units located at the front of this nappe (Piz Terri-Lunschania and Soja nappes). The Grava and Tomül nappes display traces of an early Alpine blueschist-facies metamorphism (Wiederkehr et al. 2008). The roots of all these units are located in the “Misox Zone”, which separates the Adula and Tambo nappes, and are interrupted southeast of Mesocco by the Forcola Normal Fault in its hangingwall. Meyre et al. (1998) see in contrast the Forcola Fault overlying the “Bündnerschiefer” units and these to be in the footwall of this fault that displaces them with respect to the ophiolitic Chiavenna Nappe in its hangingwall.