nappe des Gets

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Darstellung und Status

Index
Gt
Farbe CMYK
N/A
Farbe RGB
R: 241 G: 239 B: 237
Rang
Decke
Gebrauch
Element ist in Gebrauch
Status
gültig

Nomenklatur

Deutsch
Gets-Decke
Français
nappe des Gets
Italiano
falda delle Gets
English
Gets nappe
Herkunft des Namens

Les Gets (Haute-Savoie, France)

Historische Varianten

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

Beschreibung

Beschreibung

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

Alter

Alter Top
  • Campanien

Alter Basis
  • Cénomanien

Geografie

Geographische Verbreitung
Des Gets (France) à Zweisimmen.
Typusregion
Massif des Gets (Chablais savoyard, France)

Paläogeografie und Tektonik

Paläogeografie
Piemont-Ligurischer-Ozean
Tektonische Einheit (bzw. Überbegriff)
Herkunftstyp
  • ophiolithisch
Metamorphose
monozyklisch
Metamorphosefazies
  • schwache Metamorphose

Referenzen

Neubearbeitung
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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