Voralp-Granit
Back to Aar MassifRepresentation 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
- Superordinate unit
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
- Grat
- (2678775 / 1169075)
- Labhart & Renner 2012 S.21: Apophysen und Apligänge des Zentralen Aare-Granit in den Voralp-Granit
-
Chelenalphütte (UR)
Site particularities- Untergrenze
- (2677050 / 1169600)
- Labhart & Renner 2012 S.21: Intrusivkontakt im Altkrisallin am Wanderweg zur Bergseehütte
-
Hoch Horefellistock (UR)
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- plutonic
- Metamorphism
- monocyclic
- Metamorphic facies
-
- greenschist facies (epizone)
References
- Definition
-
(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).