Mélange de la Méchandeur

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Representation and status

Color CMYK
(0%,0%,20%,2%)
Color RGB
R: 250 G: 250 B: 200
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Méchandeur-Melange
Français
Mélange de la Méchandeur
Italiano
Mélange della Méchandeur
English
Méchandeur Mélange
Origin of the Name

Méchandeur (France) (voir aussi sur le géoportail de l'IGN)

Historical Variants

schistes à blocs (Fudral 1998), grey schists (Antoine 1971, Loprieno 2001), formation de la Méchandeur = Méchandeur Formation = supra-Tarentaise wildflysch = Méchandeur flysch and wildflysch (Masson et al. 2008), Méchandeur Formation (Steck 2008)

Description

Thickness
20-80 m, généralement autour de 50 m (Masson et al. 2008).

Geography

Type area
Vallée du Versoyen (France)

References

Definition
Masson Henri, Bussy François, Eichenberger Marc, Giroud Niels, Meilhac Caroline, Presniakov Sergei (2008) : Early Carboniferous age of the Versoyen ophiolites and consequences: non-existence of a “Valais ocean” (Lower Penninic, western Alps). Bull. Soc. géol. Fr. 179/4, 337-355

p.344: A flysch and a wildflysch are in principle two different things, but the interval between the Aroley limestone and the base of the Versoyen zone shows both types of rock associations more or less intimately linked, with lateral and vertical transitions from one to the other. This is why, at the present stage of research and for practical reasons, we group the flysch and the wildflysch into one single lithostratigraphic subdivision that we call the Méchandeur Formation. Its thickness is usually around 50 m, increasing sometimes up to 80 m and decreasing at other places to less than 20 m.

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