• Zone de cisaillement de Roisan–Cignana

    Origin of the Name

    Roisan (Italia), N Aoste

    Rank
    tectonic zone
    Status
    informal term
    Age
    Permian - Middle Triassic
    In short

    The Roisan-Cignana Shear Zone consists of slices of Mesozoic sediments and crystalline basement in a mylonitic matrix derived from the adjacent Dent Blanche Nappe (Arolla Unit) and of the Mont Mary Nappe (Lower and Upper units). The high-pressure mineral assemblages along the contact between these tectonic slices indicates that their emplacement occurred in an early deformation stage, before or during the subduction.

    Nomenclatorial Remarks

    commune du Val d'Aoste

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  • Méta-chert de la Becca di Salé

    Origin of the Name

    Becca di Salé (Italia)

    Rank
    lithostratigraphic unit
    Status
    local name (informal)
    In short

    Microquartzites rubanés à niveaux manganésifères, ferrugineux et phosphatés, présents localement dans la zone de Roisan.

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  • Marbres de Roisan

    Origin of the Name

    Roisan (Italia), N Aoste

    Rank
    lithostratigraphic Formation
    Status
    informal term
    Age
    Late Triassic
    In short

    Marbres, marbres dolomitiques, dolomies fines et sombres, dolomies blanchâtres plus grossières et litées, fins niveaux de quartzites, brèches.

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