Voralp-Granit

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Representation and status

Index
gamm-V
Color CMYK
(0%,51%,49%,16%)
Color RGB
R: 215 G: 105 B: 110
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term
Status discussion

Nomenclature

Deutsch
Voralp-Granit
Français
Granite de la Voralp
Italiano
Granito della Voralp
English
Voralp Granite
Origin of the Name

Voralp (UR), 7 km ENE Göschenen

Historical Variants

Voralp-Granit (Labhart & Renner 2012), Voralp Granite (Berger et al. 2017)

Description

Thickness
12 km langer und 1-2,5 km breiter Zug (Labhart & Renner 2012).

Hierarchy and sequence

Age

Age at top
  • Late Carboniferous (= Pennsylvanian)
Age at base
  • Late Carboniferous (= Pennsylvanian)
Dating Method

309 +/-2 Ma (Schaltegger & Corfu 1992)

Geography

Geographical extent
Zwischen dem Chelenalptal, dem Chli Horefellistock in der Voralp und dem Meiental, nördlich an den Zentralen Aare-Granit anlehnend.
Type area
Voralpgebiet (UR)
Point of interest
  • Hoch Horefellistock (UR)
    Site particularities
    • Obergrenze
    Site accessibility
    • Grat
    Coordinates
    • (2678775 / 1169075)
    Note
    • Labhart & Renner 2012 S.21: Apophysen und Apligänge des Zentralen Aare-Granit in den Voralp-Granit
  • Chelenalphütte (UR)
    Site particularities
    • Untergrenze
    Coordinates
    • (2677050 / 1169600)
    Note
    • Labhart & Renner 2012 S.21: Intrusivkontakt im Altkrisallin am Wanderweg zur Bergseehütte

Palaenography and tectonic

Tectonic unit (resp. main category)
Kind of protolith
  • plutonic
Metamorphism
monocyclic
Metamorphic facies
  • greenschist facies (epizone)

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.41: The Voralp Granite, a leucocratic, medium-grained granite, intrudes the Ofenhorn-Stampfhorn Gneiss Complex of the Sustenhorn Zone and is intruded by the Central Aar Granite. Its petrography and geochemistry is very similar to the Brunni Granite. It contains local swarms of dioritic “Schollen” (LABHART et al. 2015b). The Alpine overprint is variable but can be identified by the growth of greenschist-facies minerals such as chlorite and stilpnomelane (LABHART & RENNER 2012). SCHALTEGGER & CORFU 1992 (Fig.4) determined an intrusion age of 309±2 Ma. An impressive swarm of rhyolitic and basic dykes crosscuts the Ofenhorn-Stampfhorn Gneiss Complex of the Sustenhorn Zone and the Voralp Granite in the vicinity of the Fleckistock (LABHART et al. 2015b).

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