Embd-Member

Rappresentazione e statuto

Colore CMYK

(0%,47%,72%,8%)

Colore RGB

R: 235 G: 125 B: 65

Rango

Membro litostratigrafico (Sotto-formazione)

Uso

Unità in uso.

Status

termine informale

Nomenclatura

Deutsch

Embd-Member

Français

Membre d'Embd

Italiano

Membro di Embd

English

Embd Member

Origine del nome

Embd (VS)

Varianti storiche

ältere Quarzite (Jäckli 1950), Embd Member (Genier et al. 2008, Galster et al. 2010)

Descrizione

Potenza

20 m im Mattertal (Genier et al. 2008)

Gerarchia e successione

Unità di rango superiore

• Bruneggjoch-Formation

Unità sovrastante

• Membre de Sous le Rocher

Limite superiore

Sous-le-Rocher-Member

Limite inferiore

Moosalp-Formation

Età

Geomorfologia

• Tardo Permiano

Età alla base

• Tardo Permiano

Geografia

Regione-tipo

Mattertal (VS)

Paleogeografia e tettonica

Termini generici

• Siviez-Mischabel

Tipo di origine

• sedimentaria

Metamorfismo

monociclico

Referenze

Definizione

Genier Florian, Epard Jean-Luc, Bussy François, Magna Tomas (2008) : Lithostratigraphy and U-Pb zircon dating in the overturned limb of the Siviez-Mischabel nappe: a new key for Middle Penninic nappe geometry. Swiss J. Geosci. 101/2, 431–452

p.441: The lower part of the [Bruneggjoch] formation, mostly in sharp contact with white or green micaschists of the Moosalp Formation, is composed of massive, green, fine grained, microconglomeratic or conglomeratic quartzite (Fig. 7D). It is the typical rock extracted from the Kalpetran quarry to build roofs in the region. This quartzite is easy to access in the Embd locality (630.05/118.40/1415 m). In this locality, it is well exposed and the contacts with the surrounding formations can be easily observed. Consequently we propose to call Embd Member this quartzite type, as it has until yet not been named. This member is around 20 metres thick along the Mattertal. Characteristic conglomerates with pink quartz pebbles (Briançonnais Verrucano-type; Trümpy 1966), occurring in various places (Embd, Törbel), are part of this quartzite. It crops out on the west side of the Mattertal in a zone of plurikilometre long extension, forming the core of the St-Niklaus syncline. This quartzite contains broken microcline grains (2–5%, 0.5–2 mm) with albitic rims and pressure shadows composed of quartz and phengite. The matrix is composed of quartz (75–55%, 0.01–0.3 mm), subidiomorphic phengite (25–40%, 0.05–0.5 mm) and accessory albite (0.1–0.2 mm).