Val-Lavaz-Gruppe (spätvariszische Intrusiva)

Représentation et statut

Couleur CMYK

(0%,47%,55%,4%)

Couleur RGB

R: 245 G: 130 B: 110

Rang

Groupe lithostratigraphique

Usage

Ce terme est en usage.

Status

terme informel

Nomenclature

Deutsch

Val-Lavaz-Gruppe (spätvariszische Intrusiva)

Français

Groupe du Val Lavaz

Italiano

Gruppo della Val Lavaz

English

Val Lavaz Group

Origine du nom

Val Lavaz (GR)

Variantes historiques

Ältere Granite (Spillmann et al. 2011), Postvariszische Intrusiva [sic] (Vögeli et al. 2013), Val Lavaz Group (Berger et al. 2017)

Hiérarchie et succession

Unités hiérarchiquement subordonnées

• Gamsboden-Granit
• Granito della Fibbia
• Medel-Granit
• Cristallina-Granodiorit
• Uffiern-Diorit

Âge

Âge au sommet

• Assélien

Âge à la base

• Carbonifère tardif (= Pennsylvanien)

Paléogéographie et tectonique

• Roches plutoniques varisques de l'Helvétique

Paléogéographie

plaque continentale européenne

Termes génériques

• Gotthard

Type de protolithe

• plutonique

Références

Définition

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.72: The Uffiern Diorite, the Cristallina Granodiorite and the Medel Granite constitute a single coherent plutonic complex towards the eastern end of the Gotthard Nappe. The Medel Granite is coarse-grained and locally porphyric, while the Cristallina Granodiorite is more fine-grained and equigranular. MERZ (1989) described the petrographic and structural characteristic of both units. VÖGELI et al.(2013) described the small occurrence of the Uffiern Diorite. The Medel Granite envelops the northern and the western part of the complex, whereas the Cristallina Granodiorite occupies the centre and the southern part. The roughly north–south oriented western intrusive contact of the Medel Granite perpendicularly crosscuts the steeply east–west oriented structures of the polycyclic metamorphic basement (Ausserbinn-Piz Cavel Zone) as well as the pre- to early Variscan metasedimentary and volcaniclastic sequences of the Val Rondadura Group. This is one of the important observations that allowed the reconstruction of the pre-Alpine evolution of the Gotthard Nappe (see MERCOLLI et al.1994 and references therein).