nappe des Gets

Retour à nappe des Gets

Représentation et statut

Index
Gt
Couleur CMYK
N/A
Couleur RGB
R: 241 G: 239 B: 237
Rang
nappe
Usage
Ce terme est en usage.
Status
valide

Nomenclature

Deutsch
Gets-Decke
Français
nappe des Gets
Italiano
falda delle Gets
English
Gets nappe
Origine du nom

Les Gets (Haute-Savoie, France)

Variantes historiques

nappe du Col des Gêts (Trümpy 1976), nappe des Gets (Plancherel 1998), Gets nappe (Bill et al. 2001)

Description

Description

riche en ophiolites (cf. schistes lustrés piémontais ou Canavese ligure)

Âge

Âge au sommet
  • Campanien

Âge à la base
  • Cénomanien

Géographie

Extension géographique
Des Gets (France) à Zweisimmen.
Région-type
Massif des Gets (Chablais savoyard, France)

Paléogéographie et tectonique

Paléogéographie
bassin liguro-piémontais
Termes génériques
Type de protolithe
  • ophiolitique
Métamorphisme
monocyclique
Faciès métamorphique
  • faible métamorphisme

Références

Révision
Bill Markus, Masson Henri, Thélin Philippe (2001) : Low-grade metamorphism of the Gets nappe (Western Alps). Schweiz. Mineral. Petrogr. Mitt. 81, 229-237

The Gets nappe is a decollement cover nappe situated in the front of the Alpine belt. This nappe was affected by very weak metamorphism, preliminary illite crystallinity data suggest anchizonal conditions (Caron and Weidmann, 1967).

[...]

The Gets nappe is composed of two series (Caron, 1972): the base of the nappe (Perrieres series) essentially comprises a composite wildflysch containing ophiolitic material (serpentinite, gabbro, basalt and diabase). deep marine deposits (radiolarite, pelagic limestone, manganiferous shale), and Palaeozoic granite, all embedded in a shaly matrix (Fig. 2). The disrupted oceanic crust, the melange of ophiolitic rocks and the chaotic sedimentation are characteristic of an accretionary prism sequence (e.g. Mascle et al., 1988; Pickering et al., 1989). Isotopic dating, trace element data and Sm-Nd isotopes of the gabbros and basalts of the Gets nappe, together with structural and stratigraphic evolution of the northwest Shoulder of the Piedmont rift indicate that. at least in part, the ophiolitic material of the Gets nappe is a remnant of the onset of the Piedmont ocean spreading (Bill et al. 1997,2000,2001).The composite wildflysch is overlain by the Hundsrück series, composed mainly of turbiditic sandstones and polygenic conglomerates of Upper Cretaceous age.

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