Detached North Alpine Foreland
Rappresentazione 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
- Abgeschertes Nordalpines Vorland
- Français
- Avant-pays nord-alpin décollé
- Italiano
- Avampaese nordalpino distaccato
- English
- Detached North Alpine Foreland
- Varianti storiche
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Sheared-off North Alpine Foreland, Avant-pays nordalpin décollé, Detached North Alpine Foreland (TK500 / Gouffon et al. 2024)
Descrizione
- Descrizione
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Alpin deformierter europäischer Kontinentalschelf ausserhalb der Alpen s.s.
Gerarchia e successione
- Unità di rango inferiore
Paleogeografia e tettonica
- Paleogeografia
- North Alpine Foreland Basin
- Tipo di origine
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- tettonico
Referenze
- Revisione
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(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.22: The Detached North Alpine Foreland refers to the displaced sedimentary cover north of the front of the Helvetic units. The deformation began in Mid to Late Miocene and lasted, depending on the author, until the end of the Miocene, the Pliocene or is still ongoing today (see compilation and discussion in Schori 2021). Decoupling between the thrusted and deformed cover and the underlying basement took place in a décollement zone in the evaporites of Muschelkalk Group east of a line Porrentruy–Biel–Fribourg and of the Keuper Group further west (Jordan 1992). Deformation includes northwestward and northward displacement, thrusting and folding as well as strike-slip deformation. The northern boundary, which coincides with the front of Alpine deformation, is given by the outermost (distal) significant thrusting and folding. The easternmost clear evidence for décollement-related tectonics is given by the Lägern Anticline east of Baden with some more indications from seismic data found south of Bülach (Naef et al. 1995, Malz et al. 2016, Madritsch et al. 2024). Further to the east, displacement of the sedimentary cover along the decollement zone is presumed to gradually decrease. Accordingly, no precise eastern boundary can be drawn between the Detached North Alpine Foreland and the autochthonous South German Platform and a conceptual transition zone is defined instead (see § 3.2 for details).
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Subalpine Molasse
- Rango
- unità tettonica
- Statuto
- valido
- In breve
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The Subalpine Molasse constitutes the southernmost subdomain of the Detached North Alpine Foreland, situated between the Foreland Plateau to the north and the first basal thrust of the Alpine nappes to the south. It consists of a stack of imbricated thrust slices where the beds generally dip towards the SE. The Subalpine Molasse mainly includes coarse-grained foreland basin strata that were deposited between about 32 and 20 Ma. They chronicle the change from the underfilled Flysch to the filled/overfilled Molasse stage of foreland basin evolution.
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Vorlandplateau
- Rango
- unità tettonica
- Statuto
- termine locale (informale)
- In breve
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The Foreland Plateau covers the detached part of the Molasse Basin and its Mesozoic basement. It is characterized by NE–SW trending low amplitude folds.
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Internal Folded Jura
- Name Origin
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Partie interne (la plus proche des Alpes) du Jura plissé, formant les plus hauts sommets de la chaîne jurassienne.
- Rango
- tettonica
- Statuto
- termine informale
- In breve
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The Internal Folded Jura represents the most intensely deformed part of the Detached North Alpine Foreland. In a similar manner to the whole Jura Mountains, it forms a prominent arcuate chain («Haute Chaîne») in eastern France and northwestern Switzerland.
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External Folded Jura
- Name Origin
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Partie externe (la plus éloignée des Alpes) du Jura plissé.
- Rango
- sottodominio tettonico
- Statuto
- termine informale
- In breve
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The External Folded Jura is the outermost part of the arcuate Jura mountain range (and hence of the Detached Northern Alpine Foreland) consisting of low-relief Plateaux, only slightly faulted, separated from each other by narrow, highly deformed Faisceaux.
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Abgescherter Tafeljura
- Rango
- unità tettonica
- Statuto
- termine locale (informale)
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«Vorfaltenzone»
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- unità tettonica
- Statuto
- termine informale
- In breve
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The «Vorfaltenzone» is a faisceaux-type fold belt of the External Folded Jura, partly hidden by the overthrust Internal Folded Jura.
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zone des Avant-Monts
- Rango
- zona tettonica
- Statuto
- valido
- In breve
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Région monoclinale, localement plissée, de la partie frontale du Jura (zone préjurassienne) chevauchant le plateau de Haute-Saône (bordure oriental du Bassin de Paris) par l'intermédiaire de la faille de l'Ognon. Cette zone constitue l'ultime front compressif du Jura.
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Faisceaux
- Rango
- unità tettonica
- Statuto
- termine locale (informale)
- In breve
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The Faisceaux are narrow zones of intense deformation of the External Folded Jura. They separate largely undeformed or only slightly deformed tabular areas known as Plateaux.
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Mandacher Störung
- Name Origin
- Rango
- tettonica
- Statuto
- termine informale
- In breve
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The Mandach Thrust is considered as the northern boundary of the Detached North Alpine Foreland.
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«Vorfaltenzone»
- Rango
- unità tettonica
- Statuto
- termine informale
- In breve
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The «Vorfaltenzone» is a faisceaux-type fold belt of the External Folded Jura, partly hidden by the overthrust Internal Folded Jura.
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Plateaux
- Rango
- unità tettonica
- Statuto
- termine locale (informale)
- In breve
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The Plateaux are largely undeformed or only slightly deformed tabular areas of the External Folded Jura. They are separated by narrow zones of intense deformation known as Faisceaux.
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Bözberg Plateau
- Name Origin
- Rango
- tettonica
- Statuto
- termine locale (informale)
- In breve
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The Bözberg Plateau is a small plateau of the External Folded Jura, detached for a few hundreds of meters to the north. It is limited to the north by the frontal Mandach Thrust and to the south by the «Vorfaltenzone» (partly hidden by the overthrust Internal Folded Jura).