Externes Aar-Massiv
Torna a Massiccio dell'AarRappresentazione e statuto
- Colore CMYK
- N/A
- Colore RGB
- R: 241 G: 239 B: 237
- Rango
- dominio tettonico
- Uso
- Unità in uso.
- Status
- valido
Nomenclatura
- Deutsch
- Externes Aar-Massiv
- Français
- Massif de l'Aar externe
- Italiano
- Massiccio dell'Aare esterno
- English
- External Aar Massif
- Varianti storiche
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externes Aar-Massiv (Sartori et al. 2017), External Aar Massif (TK500 / Gouffon et al. 2024)
Descrizione
- Descrizione
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... nördlich der Roti-Chüe-Gampel-Scherzone.
Gerarchia e successione
- Unità di rango inferiore
Referenze
- Revisione
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(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.33: The Aar Massif and its autochthonous-parautochthonous sedimentary cover occupies a belt about 20 km wide and 160 km long in the central part of the Alps, between Sierre in Valais and Landquart in Graubünden. It is subdivided by several faults into a large External Aar Massif, making up almost the entire width of the Aar Massif in its central part, and a thinner Internal Aar Massif, which is subdivied into two submassifs: the Baldschieder-Gletsch Submassif, which crops out in upper Valais region, south of the Rote Kuh-Gampel Shear Zone – a reactivated paleofault – and its possible continuation between Aletsch and Rhône glaciers, and the Trun-Punteglias Submassif in the Surselva (Graubünden). North of the Lötschental, the External Aar Massif overthrusts the Gastern Submassif. The contact is marked by a thin band of Triassic and Jurassic sediments (the “Jungfrau Wedge”), which includes overturned sediments of the External Aar Massif. The entire Aar Massif is made up of a pre-Variscan to Variscan polycyclic metamorphic basement with Variscan intrusions. Several large-scale structures follow the general strike of the External Aar Massif. They include longitudinal faults and very tight synclines exposing Late Paleozoic and Mesozoic sediments.
p.34: At the southwestern end of the External Aar Massif, the Triassic and part of the Early Jurassic cover remained autochthonous, whereas the Jurassic and Cretaceous cover was transported progressively towards the north to build the Doldenhorn Nappe. East of the Gastern Submassif, the cover thickens rapidly and is complemented by Late Jurassic to the Paleogene sediments. Even further east, from the Haslital, the Upper Paleocene North Helvetic Flysch is added to the sequence.