Punteglias-Granit
Back to Aar massifRepresentation and status
- Index
- gamma-P
- Color CMYK
- (0%,60%,47%,16%)
- Color RGB
- R: 215 G: 85 B: 115
- Rank
- lithostratigraphic Formation
- Validity
- Unit is in Use
- Status discussion
Nomenclature
- Deutsch
- Punteglias-Granit
- Français
- Granite du Val Punteglias
- Italiano
- Granito della Val Punteglias
- English
- Punteglias Granite
- Origin of the Name
- Historical Variants
-
granites porphyroïdes de Pontelja = granites porphyroïdes de Trons (Guyot 1844), Puntaigliasgestein = Pontegliasgestein (Studer 1872), Granit von Val Puntaiglas = Puntaiglasgranit (Heim 1919), Puntegliasgranit (Rutsch et al. 1966), Punteglias-Syenitgranit (de Quervain 1969), Punteglias Granite (Schaltegger et al. 1991), Punteglias Granite Complex (Berger et al. 2017), Punteglias-Granit (Gisler 2018)
Age
- Age at top
-
- Visean
- Age at base
-
- Visean
- Dating Method
-
332.0 +/-2 Ma (Schaltegger & Corfu 1992), 332.2 +/-0.9 Ma (Schaltegger, unpubl.)
Geography
- Geographical extent
- Bündner Oberland, zwischen Val Rusein und Val Punteglias.
- Type area
- E und W des obern Val Punteglias (GR)
References
- Definition
-
(1872) :
Index der Petrographie und Stratigraphie der Schweiz und ihrer Umgebungen. Dalp (Bern)
S.194: Puntaigliasgestein
Pontegliasgestein; Syenitgneiss vom Rath; Ponteljasgranit n.A. Zahlreiche bis 1 Zoll lange, aber schmale Zwillinge von weissem Orthoklas, in einem kleinkörnigen Gemenge von grauem Quarz, vorherrschendem schwarzem Glimmer und Hornblende. Vertical zerklüftet, eine hohe Felsstufe bildend, die von vielen Euritgängen durchsetzt wird. Im Hintergrund des Puntaigliastobels, oberhalb Throns, in der Gletscherregion bedeckt von mächtigen Kalkgebirgen. Nach vorn umschlossen von dunkeln Hornblendgesteinen, worin früher auf Magneteisen und Kupfererze Bergbau getrieben worden ist. Der Granit durchsetzt das Gebirge und kommt auch, nordöstlich, im Hintergrunf des nach Brigels auslaufenden Frisaltthales wieder zu Tage.
- Definition
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.38: The Punteglias Granite Complex consists of a suite of magmatic bodies intruding the Strem Granite and the gneiss complexes of the Ausserberg-Avat Zone in the areas of Val Lumpegna and Val Frisal. The “diorites to monzodiorite of Val Punteglias” intruded by the slightly younger “Punteglias Granite” (SCHALTEGGER et al.1991) were grouped together to the Punteglias Granite Complex on the present map sheet. Very small outcrops of biotite-hornblendite, melanocratic diorite, quartz monzodiorite and quartz monzonite (KÜPFER 1974, SCHALTEGGER et al. 1991) constitute basic members of the Punteglias Granite Complex. The Punteglias Granite is a large body, ranging in composition from granodiorite to monzogranite and rimmed by genetically related, more leucocratic stocks and dykes (i.e., “Posta Biala Granite” of SEEMANN 1975). It constitutes the granitic member of the Punteglias Granite Complex. The main rock type contains alkali-feldspar porphyroblasts up to 4 cm in size as well as hornblende and titanite. Heterogeneous distribution of the mafic components leads to leucocratic to melanocratic facies (SEEMANN 1975). Magmatic flow fabrics are visible in areas containing large K-feldspars. In addition, its rim evidences more homogeneous grain size and stronger deformation. The chemical composition of the different variations is given in SEEMANN (1975) and SCHALTEGGER et al.(1991). SCHALTEGGER & CORFU (1992) dated the Punteglias Granite at 332±2 Ma (Fig.4).