• Schams-Deckenkomplex

    Herkunft des Namens

    Schams = Val Schons (GR), Hinterrheintal

    Rang
    Deckenkomplex
    Status
    gültig
    Alter
    Karbon - Eozän
    Kurzbeschreibung

    The Schams Nappe Complex is a Middle Penninic tectonic unit of eastern Switzerland encompassing a set of small nappes, which were folded after their emplacement around the Tambo-Suretta pair during the Niemet-Beverin post-nappe folding. The Schams Nappe Complex also contains different mélanges: to the west, in the lower limb of the Niemet-Beverin Backfold, the Knorren Mélange is in contact with the Tambo Nappe, while the Areua-Bruschghorn Mélange marks the boundary with the Tomül Nappe; to the east, in the upper (overturned) limb of the Niemet-Beverin Backfold, the Martegnas Mélange is in contact with the Arblatsch Flysch belonging to the Tomül Nappe.

    The sedimentary sequences of the Schams Nappe Complex exhibit large facies variations and are rich in sedimentary syn-rift breccias of Middle Jurassic to Early Cretaceous age, indicating contemporaneous extension and sinistral strike-slip. The mid-Cretaceous to Cenozoic post-rift sediments are very similar to those found in the Falknis Nappe. Retrodeformation suggests that the Schams nappes formerly occupied an area north of the depositional area of the Tambo and Suretta Mesozoic. This is supported by facies arguments indicating that sediments in the originally northernmost paleogeographical position (now forming the Gelbhorn Nappe) suggest N-directed shedding of syn-rift breccias, and by the Subbriançonnais-type facies of the Triassic strata.

    Rueck_1995_f39
    Nomenklatorische Bemerkungen

    cf. Schreurs 1990, Schmid et al. 1990

  • Gelbhorn-Decke

    Herkunft des Namens

    Gelbhorn = Piz Mellen (GR)

    Rang
    Decke
    Status
    gültig
    Kurzbeschreibung

    The Gelbhorn Nappe is part of the Schams Nappe Complex. In the hanging wall of the Suretta Nappe (eastern Shams), the outer, fine-grained, calcareous limb of the unit (1b) is normal, while the inner, coarse-grained limb (1a) is overturned on the Tschera-Kalkberg Nappe. In the Westschams, and thus in the footwall of the Suretta Nappe, the structural situation is the other way round, i.e. the outer limb is overturned and the inner limb is normal.

  • Tschera-Kalkberg-Decke

    Rang
    Decke
    Status
    gültig
    Kurzbeschreibung

    The Tschera-Kalkberg Nappe is a tectonically complex, mélange-like inner sheath of the Schams Nappe Complex. It is divided into three subunits based on lithological criteria.

  • Areua-Bruschghorn-Melange

    Herkunft des Namens

    Bruschghorn (GR)

    Rang
    tektonisch-begrenzte lithostratigrafische Einheit
    Status
    informeller Begriff
    Alter
    Paläozoikum - Frühe Trias
    Kurzbeschreibung

    The Areua-Bruschghorn Mélange is a tectonic mélange situated in the lower limb of the Niemet-Beverin Backfold, at the contact between the Schams Nappe Complex and the Tomül Nappe.

    Nomenklatorische Bemerkungen

    Das im Westschams vorkommende Areua-Bruschghorn-Melange lässt sich über das Scharnier der liegenden Niemet-Beverin-Falte mit dem Martegnas-Melange im Ostschams verbinden.

    • Bruschghorn-Schuppe

      Name Origin

      Bruschghorn (GR)

      Rang
      tektonische Schuppe
      Status
      lokaler Begriff (informell)
      Kurzbeschreibung

      Gneis, Dolomit, Gips und Prasinit.

    • Burgruinen-Gneis

      Name Origin

      Burgruine Splügen (GR)

      Rang
      lithostratigraphische Formation
      Status
      informeller Begriff
      Kurzbeschreibung
      Hellgrauer, quarzreicher Orthogneis mit charakteristischen dunkelgrauen Feldspäten. Das Gestein ist von Quarzgängen (Pegmatit) durchsetzt.
  • Martegnas-Melange

    Herkunft des Namens

    Piz Martegnas (GR), Oberhalbstein

    Rang
    tektonisch-begrenzte lithostratigrafische Einheit
    Status
    lokaler Begriff (informell)
    Kurzbeschreibung

    The Martegnas Mélange is a tectonic mélange situated in the upper (overturned) limb of the Niemet-Beverin Backfold, at the contact between the Schams Nappe Complex and the Arblatsch Flysch (Tomül Nappe).

    Nomenklatorische Bemerkungen

    Das im Ostschams vorkommende Martegnas-Melange lässt sich über das Scharnier der Niemet-Beverin-Falte mit dem Areua-Bruschghorn-Melange im Westschams verbinden.

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