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

Sheared-off North Alpine Foreland, Avant-pays nordalpin décollé, Detached North Alpine Foreland (Gouffon et al. 2024)

Descrizione

Descrizione

Alpin deformierter europäischer Kontinentalschelf ausserhalb der Alpen s.s.

Gerarchia e successione

Unità di rango inferiore

• Subalpine Molasse
• Vorlandplateau
• Internal Folded Jura
• External Folded Jura

Paleogeografia e tettonica

Paleogeografia

North Alpine Foreland Basin

Referenze

Revisione

Gouffon Yves (Editor) (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).