• Salassic

    Origine del nome

    This term stems from a Celtic tribe, the Salasses, who settled in the Valle d’Aosta and the Sesia region, at the same time as the Helvetians north of the Alps and the Lepontians between Val d’Ossola and Leventina.

    Rango
    dominio tettonico
    Statuto
    valido
    In breve

    The Salassic Domain groups the tectonic units derived from an extensional allochthon split off from the most distal part of the Adriatic margin during the Middle Jurassic opening of the Piemonte-Liguria Ocean and subducted below the Austroalpine and South Alpine units in Late Cretaceous times. These units – Dent Blanche, Mont Mary and Sesia nappes in western Switzerland and adjacent Italy, together with the Margna and Sella nappes in southeastern Switzerland and partly in Italy – are characterised by their high-pressure metamorphism.
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    • Salassic of Western Switzerland

      Rango
      dominio tettonico
      Statuto
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      In breve

      The Salassic units of the western Alps (Dent Blanche, Mont Mary and Sesia nappes) are structurally similar, with an upper continental crust unit at the base (Arolla Unit, Lower Unit and Gneiss Minuti Unit) and a lower crustal unit at the top (Valpelline Unit, Upper Unit and 2 DK Zone). In the Sesia Nappe, the intermediate Eclogitic Micaschist Unit appears to be derived from a relatively deep part of the upper crust. The underwent high-pressure metamorphism during the Late Cretaceous and the Early Paleogene, mainly in the lower and intermediate units; later only, the lower units were significantly re-equilibrated under greenschist-facies conditions.

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    • Salassikum der Ostschweiz

      Rango
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      termine locale (informale)
      In breve

      The Salassic units of the eastern Alps (Margna and Sella nappes) ...

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