Val-Lavaz-Gruppe (spätvariszische Intrusiva)

Representation and status

Color CMYK
(0%,47%,55%,4%)
Color RGB
R: 245 G: 130 B: 110
Rank
lithostratigraphic Group
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Val-Lavaz-Gruppe (spätvariszische Intrusiva)
Français
Groupe du Val Lavaz
Italiano
Gruppo della Val Lavaz
English
Val Lavaz Group
Origin of the Name

Val Lavaz (GR)

Historical Variants

Ältere Granite (Spillmann et al. 2011), Postvariszische Intrusiva [sic] (Vögeli et al. 2013), Val Lavaz Group (Berger et al. 2017)

Hierarchy and sequence

Subordinate units

Age

Age at top
  • Asselian
Age at base
  • Late Carboniferous (= Pennsylvanian)

Palaenography and tectonic

  • Variscan plutonic rocks of the Helvetic
Paleogeography
European continental plate
Tectonic unit (resp. main category)
Kind of protolith
  • plutonic

References

Definition
Berger Alfons, Mercolli Ivan, Herwegh Marco, Gnos Edwin (2017) : Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129

p.72: The Uffiern Diorite, the Cristallina Granodiorite and the Medel Granite constitute a single coherent plutonic complex towards the eastern end of the Gotthard Nappe. The Medel Granite is coarse-grained and locally porphyric, while the Cristallina Granodiorite is more fine-grained and equigranular. MERZ (1989) described the petrographic and structural characteristic of both units. VÖGELI et al.(2013) described the small occurrence of the Uffiern Diorite. The Medel Granite envelops the northern and the western part of the complex, whereas the Cristallina Granodiorite occupies the centre and the southern part. The roughly north–south oriented western intrusive contact of the Medel Granite perpendicularly crosscuts the steeply east–west oriented structures of the polycyclic metamorphic basement (Ausserbinn-Piz Cavel Zone) as well as the pre- to early Variscan metasedimentary and volcaniclastic sequences of the Val Rondadura Group. This is one of the important observations that allowed the reconstruction of the pre-Alpine evolution of the Gotthard Nappe (see MERCOLLI et al.1994 and references therein).

  • Gamsboden-Granit

    Name Origin

    Gamsboden (UR), Hospental

    Rank
    lithostratigraphic Formation
    Status
    informal term
    In short

    Spätvariszischer, heller, mittel- bis grobkörniger Zweiglimmer-Augengneis der nördliche zentrale Gotthard-Decke, mit grossen Alkalifeldspäten.

    Age
    Late Carboniferous (= Pennsylvanian)
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  • Granito della Fibbia

    Name Origin

    La Fibbia (TI), Gipfel 4,5 km WNW Airolo

    Rank
    lithostratigraphic Formation
    Status
    informal term
    Nomenclatorial Remarks
    <p>Gotthardgranit (s.s.) auct.</p>
    In short

    Spätvariszischer, heller, mittel- bis grobkörniger Zweiglimmer-Augengneis der südliche zentrale Gotthard-Decke, mit grossen Alkalifeldspäten.

    Age
    Late Carboniferous (= Pennsylvanian)
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  • Medel-Granit

    Name Origin

    Val Medel = Medelser Tal (GR)

    Rank
    lithostratigraphic Formation
    Status
    informal term
    In short

    Intrusione granitica tarda- fino a postvarisca della falda Gottardo orientale: granito grossolano, porfirico fino gneiss granitico grigio-chiaro, localmente scistoso.

    Age
    Early Permian
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  • Cristallina-Granodiorit

    Name Origin

    Val Cristallina (GR)

    Rank
    lithostratigraphic Formation
    Status
    informal term
    In short

    Granodiorite tardo- fino a postvarisco della falda Gottardo orientale, mesocratica, scistoso-fusolare.

    Age
    Late Carboniferous (= Pennsylvanian)
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    • Aplitgranitstock des Piz dalla Siala

      Name Origin

      Piz dalla Siala (GR)

      Rank
      regional facies
      Status
      local name (informal)
      In short
      Kleines Biotit-Granit-Vorkommen, das eine granitische Fazies innerhalb des Cristallina-Granodiorites darstellt.
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  • Uffiern-Diorit

    Name Origin

    Umgebung der Fassungsanlage Bucca di Uffiern (GR), im wetlischen Val Uffiern (Seitental der Val Cristallina)

    Rank
    lithostratigraphic Formation
    Status
    informal term
    In short

    Spätvariszischer, dunkler, mittelkörniger, massiger quarzführender Hornblende-Biotit-Diorit der östliche Gotthard-Decke.

    Age
    Late Carboniferous (= Pennsylvanian)
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