Nappe des Gets
Torna a falda delle GetsRappresentazione e statuto
- Index
- Gt
- Colore CMYK
- N/A
- Colore RGB
- R: 241 G: 239 B: 237
- Rango
- falda
- Uso
- Unità in uso.
- Status
- valido
Nomenclatura
- Deutsch
- Gets-Decke
- Français
- Nappe des Gets
- Italiano
- Falda dei Gets
- English
- Gets Nappe
- Origine del nome
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Les Gets (Haute-Savoie, France)
- Varianti storiche
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nappe du Col des Gêts (Trümpy 1976), nappe des Gets (Plancherel 1998), Gets nappe (Bill et al. 2001)
Descrizione
- Descrizione
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riche en ophiolites (cf. schistes lustrés piémontais ou Canavese ligure)
Gerarchia e successione
- Limite inferiore
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Les parties internes de la nappe chevauchent la nappe de la Brèche, tandis que les parties externes chevauchent la nappe de la Simme.
Età
- Geomorfologia
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- Campaniano
- Età alla base
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- Cenomaniano
Geografia
- Estensione geografica
- Des Gets (France) à Zweisimmen.
- Regione-tipo
- Massif des Gets (Chablais savoyard, France)
Paleogeografia e tettonica
- Paleogeografia
- Bacino Piemontese
- Termini generici
- Tipo di origine
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- ofiolitico
- Metamorfismo
- monociclico
- Facies metamorfica
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- metamorfismo debole
Referenze
- Revisione
-
(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.