Bugnei-Granodiorit
Retour à massif de l'AarReprésentation et statut
- Index
- gamma-delta-B
- Couleur CMYK
- (0%,43%,52%,14%)
- Couleur RGB
- R: 215 G: 105 B: 110
- Rang
- Formation lithostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme informel
- Discussion du statut
Nomenclature
- Deutsch
- Bugnei-Granodiorit
- Français
- Granodiorite de Bugnei
- Italiano
- Granodiorite di Bugnei
- English
- Bugnei Granodiorite
- Origine du nom
-
Bugnei (GR), E Sedrun
- Variantes historiques
-
Bugneigranit (P. Niggli 1914, Staub 1914, Winterhalter 1930, Niederer 1932), Bugneigranodiorit (E. Niggli 1944), Bugneigranit = Bugneigranodiorit (Rutsch et al. 1966), Bugnei-Granodiorit (Bonanomi et al. 1992, Gisler 2018), Bugnei Granodiorite (Berger et al. 2017)
Description
- Description
-
Mineralbestand: Na-K-Feldpat, Plagioklas, Quarz, Biotit und akz. Minerale (Hornblende, Titanit, Orthit)
Hiérarchie et succession
- Unité hiérarchiquement supérieure
Âge
- Âge au sommet
-
- Pennsylvanien moyen
- Âge à la base
-
- Pennsylvanien moyen
- Méthode de datation
-
Ca. 310.6 Ma (Schaltegger, unpubl.)
Géographie
- Extension géographique
- Lokal eng begrenzte, linsenförmige Intrusivmasse in südlichen Gneisen des östlichen Aarmassivs, zwischen Sedrun und Segnas.
Paléogéographie et tectonique
- Termes génériques
- Type de protolithe
-
- plutonique
- Métamorphisme
- monocyclique
Références
- Révision
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.59: The Bugnei Granodiorite is interpreted as belonging to the Clavaniev Zone, but is shown as a separate body on the present map sheet. This plutonic body is located north of Sedrun at the boundary of the Ausserberg-Avat Zone and the Clavaniev Zone. NIGGLI (1944) describes it as petrographically identical to the granodiorites of Val Russein (Russein Diorite and Munt Dado Granite). It contains large titanites and frequent allanite (i.e., it is genetically linked to and coeval with the plutonic rocks of the Fruttstock Group). He interpreted the Bugnei Granodiorite as the undeformed relictic portion of a larger body enveloped by schist of similar composition generated by an intense deformation of probable Alpine age (NIGGLI 1944). Similarly, LEU & WYSS (1992) and KELLER (1999) showed that the Bugnei Granodiorite is embedded in mylonites of the Clavaniev Zone.