Saluver-Gruppe

Représentation et statut

Couleur CMYK

(0%,20%,55%,14%)

Couleur RGB

R: 220 G: 175 B: 100

Rang

Groupe lithostratigraphique

Usage

Ce terme est en usage.

Status

statut inconnu

Discussion du statut

Nomenclature

Deutsch

Saluver-Gruppe

Français

Groupe du (Val) Saluver

Italiano

Gruppo della (Val) Saluver

English

Saluver Group

Origine du nom

Piz Nair im oberen Val Saluver (GR)

Variantes historiques

Saluvergesteine (Studer & Escher 1853/1869), Saluverschichten = Saluverserie = Saluverschiefer + Saluversandstein + Saluverbreccie (Cornelius 1923, Cornelius 1932), Saluvergesteine = Saluverschichten (Roesli 1945), Saluver Group (Furrer et al. 1985), Saluver-Gruppe (Lüdin 1987), Syn-rift sediments = Saluver Group (Manatschal & Nievergelt 1997)

Remarques nomenclatoriales

Doggerkalke und -breccien + Oxford-Argovien (Staub 1946)

Hiérarchie et succession

Unités hiérarchiquement subordonnées

• Saluver-Formation
• Bardella-Formation
• Salteras-Formation
• Salamùn-Brekzie
• Err-Brekzie

Unités sus-jacentes

• Chanèls-Formation
• Blais-Formation

Unités sous-jacentes

• Agnelli-Formation
• Allgäu-Formation

Limite inférieure

Agnelli-Fm. (conformity) oder ältere sedimentäre bis kristalline Einheiten (unconformity) (Finger 1978, Manatschal & Nievergelt 1997)

Âge

Âge au sommet

• Callovien

Note sur le sommet

Einzelne Bänke ziehen noch bis im Blais-Radiolarit hin. Oder sogar jünger (Manatschal & Nivergelt 1997).

Âge à la base

• Toarcien

Méthode de datation

Kreide (Cornelius 1932) ; --- (Roesli 1944)

Géographie

Extension géographique

Oberengadin

Paléogéographie et tectonique

• Dogger de l'Austroalpin

Paléogéographie

bassin liguro-piémontais , marge continentale adriatique :

southern continental margin / platform

Termes génériques

• Austroalpine

Type de protolithe

• sédimentaire

Conditions de formation

Syn-rift sediments (Manatschal & Nievergelt 1997).

Références

Révision

Manatschal Gianreto, Nievergelt Peter (1997) : A continent-ocean transition recorded in the Err and Platta nappes (Eastern Switzerland). Eclogae geol. Helv. 90/1, 3-27

p.8: Syn-rift sediments

Sedimentary breccias with a variable amount of matrix and intercalated hemipelagic background sediments, sandy limestones and shales conformably overlie the top of the Agnelli Formation or unconformably overlie the older sediments or metamorphic basement rocks (Finger 1978). The very local distribution and the strong variability in composition and texture, typical for syn-rift sediments, have led to different local names for these sediments, such as Saluver Formation (Finger 1978), Bardella Formation (Finger 1978), Salteras Series (Stöcklin 1949) and Salamun Breccia (Stöcklin 1949). In this study, the name "Saluver Group" (Furrer et al. 1985) is used for these sedimentary breccias and sandstones which are often particularly rich in crystalline basement clasts. Characteristic for the sedimentary breccias of the Saluver Group are a general up-section change from pure carbonate to carbonate/crystalline breccias (Stöcklin 1949) and the occurrence of one or more thinning- and fining-upward cycles (Finger 1978). The age of most of the breccias in the Lower Austroalpine units is badly constrained but the observation that these breccias stratigraphically overlie a hardground of Early Pliensbachien age (pers. com. Heinz Furrer) and are themselves overlain by radiolarian cherts of the upper Middle to Upper Jurassic Radiolarite Formation (Baumgartner 1987) makes a Middle Jurassic age for them most likely. The fact that in some places younger strata, sometimes even Lower Cretaceous Argille a Palombini, onlap the breccias and appear to interfinger with them (e.g. Fuorcla Mulix. see below) suggests that some of the breccias might also be younger.