• Falda di Sesia

    Origin of the Name

    Alta Valsesia = Val di Sesia (Italia), S Monte Rosa

    Rank
    nappe
    Status
    valid
    In short

    The Sesia Nappe is a Salassic tectonic unit located between the Canavese Fault to the east and the Upper Penninic units to the west. It is composed of three units of crystalline basement characterized by different lithological associations: the Second Dioritic-Kinzigitic Zone, The Gneiss Minuti Unit and the Eclogitic Micaschist Unit.

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    • unità di Bard

      Name Origin

      Bard (Italia), Dora Baltea

      Rank
      tectonic zone
      Status
      local name (informal)
      In short

      Partie nord-occidentale de la zone de Sesia, composée essentiellement de gneiss à grains fins («Gneiss minuti» auct.).

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    • unità di Bonze

      Name Origin

      Cima di Bonze (Italia), S Bard

      Rank
      tectonically bounded lithostratigraphic unit
      Status
      local name (informal)
      In short

      Mince bande métasédimentaire (dépôts volcanoclastiques, marbres dolomitiques, quartzites manganésifères et schistes calc-silicatés) fortement déformée et discontinue séparant les unités de Bard et de Mombarone.

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    • unità di Mombarone

      Name Origin

      Colma di Mombarone (Italia)

      Rank
      tectonic zone
      Status
      local name (informal)
      In short

      Parties méridionale et orientale de la zone de Sesia, composée principalement de micaschistes éclogitiques («micascisti eclogitici» auct.), accompagnés de métagranitoïdes, de métabasites et de marbres du Paléozoïque tardif. L'unité est intrudée à l'Oligocène par les intrusions de Biella et de la Traversella.

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  • unità di Scalaro

    Rank
    tectonically bounded lithostratigraphic unit
    Status
    informal term
    In short

    Couverture monométamorphique de la nappe de Sesia.

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  • Seconda Zona Dioritico-Kinzigitica

    Origin of the Name

    Ressemblance avec la "(Prima) Zona Diorito-Kinzigitica" (= Zona di Ivrea-Verbano).

    Rank
    tectonically bounded lithostratigraphic unit
    Status
    incorrect name (though informally used)
    In short

    The Second Dioritic-Kinzigitic Zone (2DK) of the Sesia Nappe consists of kilometer-scale slices of micaschists, characterized by well-preserved pre-Alpine amphibolite to granulite-facies mineral assemblages as well as minor amphibolites and marbles, locally overprinted by the early Alpine high-pressure metamorphism.

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    • Granuliti della Val Vogna

      Name Origin

      Val Vogna (Italia)

      Rank
      lithostratigraphic unit
      Status
      informal term
      In short

      Paragneiss sombres à faciès granulitique (kinzigite) de la zone de Sesia comportant de nombreux mobilisats pegmatoïdes, des marbres et des roches basiques variées. L'ensemble repose sur les «gneiss minuti» albitiques par l'intermédiaire de mylonites à glaucophane.

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  • Unità dei Micascisti eclogitici

    Rank
    tectonically bounded lithostratigraphic unit
    Status
    incorrect name (though informally used)
    In short

    The Eclogitic Micaschist Unit of the Sesia Nappe comprises mostly paragneisses with minor mafic rocks, orthogneisses and calcitic marbles. Eclogitic mineral assemblages are well preserved, rarely overprinted by the subsequent greenschist-facies metamorphism.

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  • Unità dei Gneiss minuti

    Origin of the Name

    = gneiss à grain fin

    Rank
    tectonically bounded lithostratigraphic unit
    Status
    informal term
    In short

    The Gneiss Minuti Unit of the Sesia Nappe consists mainly of orthogneisses, derived from granitoid of probable Permian age and interbedded with more mafic layers. High-pressure metamorphism of this unit was largely obliterated by the later greenschist-facies metamorphism.

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    • Ortogneiss della falda di Sesia

      Rank
      lithostratigraphic Formation
      Status
      incorrect name (though informally used)
      In short

      Metagranitoïdes du complexe des "Gneiss Minuti".

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