Embd-Member

Darstellung und Status

Farbe CMYK

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

Farbe RGB

R: 235 G: 125 B: 65

Rang

lithostratigraphisches Member (Subformation)

Gebrauch

Element ist in Gebrauch

Status

informeller Begriff

Nomenklatur

Deutsch

Embd-Member

Français

Membre d'Embd

Italiano

Membro di Embd

English

Embd Member

Herkunft des Namens

Embd (VS)

Historische Varianten

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

Beschreibung

Mächtigkeit

20 m im Mattertal (Genier et al. 2008)

Hierarchie und Abfolge

Übergeordnete Einheit

• Bruneggjoch-Formation

Hangendes

• Membre de Sous le Rocher

Obergrenze

Sous-le-Rocher-Member

Untergrenze

Moosalp-Formation

Alter

Alter Top

• Spätes Perm

Alter Basis

• Spätes Perm

Geografie

Typusregion

Mattertal (VS)

Paläogeografie und Tektonik

Tektonische Einheit (bzw. Überbegriff)

• Siviez-Mischabel

Herkunftstyp

• sedimentär

Metamorphose

monozyklisch

Referenzen

Erstdefinition

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).