Grundberg-Serie

Représentation et statut

Index

GM

Couleur CMYK

(20%,10%,0%,2%)

Couleur RGB

R: 200 G: 225 B: 250

Rang

unité lithostratigraphique délimitée tectoniquement

Usage

Ce terme est en usage.

Status

terme informel

Nomenclature

Deutsch

Grundberg-Serie

Français

Série du Grundberg

Italiano

Serie del Grundberg

English

Grundberg series

Origine du nom

Grundberg (VS), SE Saas-Grund

Variantes historiques

Grundberg-Mulde (Bearth 1939, Bearth 1957), Grundberg series (Baudraz in: Steck et al. 2015)

Hiérarchie et succession

Unités hiérarchiquement subordonnées

• Wildflysch der Grundberg-Serie
• Kalkglimmerschiefer der Grundberg-Serie
• Knotiger Kalkglimmerschiefer und reiner Kalzitmarmor der Grundberg-Serie
• Dolomitmarmor und Rauwacke der Grundberg-Serie
• «Basale Arkose» der Grundberg-Serie

Âge

Âge au sommet

• Crétacé Tardif

Âge à la base

• Trias

Géographie

Extension géographique

Grundberg, Schwarzmies, ...

Références

Définition

Bearth (1939)

Révision

Steck Albrecht, Masson Henri, Robyr Martin (2015) : Tectonics of the Monte Rosa and surrounding nappes (Switzerland and Italy): Tertiary phases of subduction, thrusting and folding in the Pennine Alps. Swiss J. Geosc. 108/1, 3-34

p.13: The basement of the Portjengrat nappe is overlain at the Grundberg above Saas-Grund by its autochthonous Mesozoic sedimentary sequence studied by Vincent Baudraz (personal communication). The Grundberg series starts with a Triassic sequence composed by up to 2 m of basal arkose, 2 m of dolomitic marble and cornieule (rauhwacke). 50 cm of a nodular calcschist and 1 m of a pure calcite marble, attributed to the Jurassic, separate the Triassic sequence from the probable Late Cretaceous sequence composed by 80 m of calcschist and 9 m of a sedimentary me´lange (wildflysch; Fig. 5). Basaltic dikes occur in both the gneissic basement and the sedimentary cover (marbles) of the Portjengrat unit in the Val Bognanco (Carrupt and Schlup 1998).