Giubine-Gneiskomplex
Retour à nappe du GothardReprésentation et statut
- Index
- P-Gi
- Couleur CMYK
- (12%,0%,15%,35%)
- Couleur RGB
- R: 145 G: 165 B: 140
- Rang
- Formation lithostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme informel
Nomenclature
- Deutsch
- Giubine-Gneiskomplex
- Français
- Complexe gneissique de Giubine
- Italiano
- Complesso gneissico di Giubine
- English
- Giubine Gneiss Complex
- Origine du nom
-
Giübin = Giubine (UR)/(TI), Gipfel NW Airolo
- Variantes historiques
-
Giubineserie (Steiger 1962 S.506), Giübine series (Isra zone) (Beffa 1993), Giubine Serie (Mercolli et al. 1994), Serie di Giubine, Querbiotitgneis, Giubine Gneiss Complex (Berger et al. 2017)
Description
- Description
-
(Granat-)Glimerschiefer und Hornblendegarbenschiefer ; Schmitzengneis und Mischgneise (= Paradis-Gneiskomplex), sowie Granat-Glimmerschiefer (= Val-Rondadura-Gruppe).
- Épaisseur
- La sua potenza apparente diminuisce da ca. 500 m al margine ovest del foglio Ambri in direzione est e presenta un minimo di ca. 30 m sul fianco nord della Val Canaria. (Bianconi & Strasky 2015)
Hiérarchie et succession
- Limite supérieure
-
Il contatto con lo Gneiss listato (Streifengneis) è sempre concordante e netto al centimetro. Il suo contatto con il Granito di Medel a nord-est del Pizzo dell’Uomo è chiaramente primario: il limite ha un decorso irregolare ed è discordante rispetto alla scistosità delle rocce della «Serie di Giubine». Al contrario il contatto meridionale con lo Gneiss di Sorescia è incerto a causa della presenza nella «Serie di Giubine» di vari tipi di litologie simili allo Gneiss di Sorescia.
Âge
- Âge au sommet
-
- Paléozoïque
- Âge à la base
-
- Paléozoïque
Références
- Définition
-
(1962) :
Petrographie und Geologie des südlichen Gotthardmassivs zwischen St. Gotthard- und Lukmanierpass. Schweiz. Min. Petr. Mitt. 42/2, 381-578
Die Giubineserie ist die Gesteinszone, welche am Südrand des Streifengneises oder des Tremola(Rotondo)granits auftritt und im Süden vom Soresciagneis oder Medelsergranit begrenzt wird. S.506
- Révision
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.70: The Borel, Tenelin, Laiets and Giubine Gneiss Complexes constitute four thin, concordant intercalations of garnet-mica schist, hornblende-garnet-mica schist (“Hornblendegarbenschiefer”), calcite-bearing mica schist, amphibolite and quartzite within the units of the polycyclic metamorphic basement. While the Borel and Tenelin Gneiss Complexes form two coherent bands, which can be followed from the Pizzo Centrale area to the Lukmanierpass, the Laiets Gneiss Complex splits into three branches east of the Cristallina Granodiorite (VÖGELI et al. 2013). HUBER (1943) described the petrography and structures of the Borel and Tenelin Gneiss Complexes, whereas WINTERHALTER (1930) treated those of the Laiets Gneiss Complex. HAFNER (1958) and STEIGER (1962) mapped and described a “Giubine-Serie” from the Val Bedretto to the Lukmanierpass. MERCOLLI et al. (1994) outlined the lithological differences in the “Giubine-Serie” and proposed to split it into two branches. Following these authors, the western branch (from Val Bedretto to the region of the Lago della Sella), consisting of migmatitic gneisses, was assigned to the Paradis Gneiss Complex. In contrast, the eastern branch (from the Piz Giübin to the Pizzo dell’Uomo) comprises metasedimentary garnet-mica schist similar to that of the Tenelin and Borel Gneiss Complexes (STEIGER 1962). Therefore, the eastern branch is reported on the map sheet as the Giubine Gneiss Complex, representing a part of the Val Rondadura Group.
OBERHOLZER (1955) described a suite of discontinuous quartzite layers of a few metres thickness in the “Streifengneis” Complex west of the Rotondo Granite. These layers can be followed over a length of few kilometres and could probably represent a western continuation (at least geometrically) of the Borel and Tenelin Gneiss Complexes (MERCOLLI et al.1994). These quartzite layers are not depicted on the present map sheet.