Saluver-Gruppe

Rappresentazione e statuto

Colore CMYK

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

Colore RGB

R: 220 G: 175 B: 100

Rango

Gruppo litostratigrafico

Uso

Unità in uso.

Status

unknown

Discussione del statuto

Nomenclatura

Deutsch

Saluver-Gruppe

Français

Groupe du (Val) Saluver

Italiano

Gruppo della (Val) Saluver

English

Saluver Group

Origine del nome

Piz Nair im oberen Val Saluver (GR)

Varianti storiche

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)

Nota sul nome

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

Gerarchia e successione

Unità di rango inferiore

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

Unità sovrastante

• Chanèls-Formation
• Blais-Formation

Unità sottostante

• Agnelli-Formation
• Allgäu-Formation

Limite inferiore

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

Età

Geomorfologia

• Calloviano

Osservazioni sul tetto

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

Età alla base

• Toarciano

Metodo di datazione

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

Geografia

Estensione geografica

Oberengadin

Paleogeografia e tettonica

• Dogger des Ostalpins

Paleogeografia

Bacino Piemontese , margine continentale adriatico :

southern continental margin / platform

Termini generici

• Austroalpine

Tipo di origine

• sedimentaria

Condizioni di formazione

Syn-rift sediments (Manatschal & Nievergelt 1997).

Referenze

Revisione

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.