• Complesso di falde di Antigorio

    Rank
    nappe complex
    Status
    valid
    In short

    The Antigorio Nappe Complex is a composite tectonic unit of the Western Lepontic (Toce Culmination) grouping together the Antigorio Nappe and the Mergoscia Zone. The boundary between these two units, affected by isoclinal folds, has been defined differently by the authors and is even completely unidentifiable in the Southern Steep Belt (or “root zone” north of the Tonale Fault), where the rocks of each of these units are no longer recognizable due to their migmatization.

    • Falda di Antigorio

      Name Origin

      Valle Antigorio (Italia)

      Rank
      nappe
      Status
      valid
      In short

      The Antigorio Nappe is a tectonic nappe of the Western Lepontic (Toce Culimnation) consisting mainly of Variscan granitoids. In its northwestern part, this basement is surrounded by an autochthonous Mesozoic–Paleogene sedimentary cover, which could be connected to the cover of the Verampio Nappe via an early thrust syncline. Late folding is responsible for two multi-kilometer-scale isoclinal structures: the Alpe Bosa-Wandfluhhorn fold and the Ziccher fold.

      Age
      Cisuralian (= Early Permian)
      • zona della Pioda di Crana

        Name Origin

        Pioda di Crana (Italia), Valle Vigezzo

        Rank
        tectonically bounded lithostratigraphic unit
        Status
        informal term
        In short

        Denominazione della falda di Antigorio nel fianco superiore della grande struttura Wandfluhhorn-Bosa.

        Age
        Late Carboniferous (= Pennsylvanian)
    • Zona di Mergoscia

      Name Origin

      Valle di Mergoscia (TI)

      Rank
      tectonic zone
      Status
      informal term
      In short

      The Mergoscia Zone is a heterogeneous tectonic unit of the Western Lepontic (Toce Culimnation). It is composed of ortho- and paragneisses, metapelites, calcschists, metabasites and meta-ultrabasites. Both metabasites and meta-ultrabasites contain rare relics of high-pressure metamorphism (retrogressed eclogites and garnet-metaperidotites). This zone, displaying a high degree of deformation, is also interpreted as a mélange rather than as an originally stratified framework.

      Age
      Paleozoic
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