Giubine-Gneiskomplex

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Representation and status

Index
P-Gi
Color CMYK
(12%,0%,15%,35%)
Color RGB
R: 145 G: 165 B: 140
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Giubine-Gneiskomplex
Français
Complexe gneissique de Giubine
Italiano
Complesso gneissico di Giubine
English
Giubine Gneiss Complex
Origin of the Name

Giübin = Giubine (UR)/(TI), Gipfel NW Airolo

Historical Variants

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).

Thickness
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)

Hierarchy and sequence

Upper boundary

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.

Age

Age at top
  • Paleozoic
Age at base
  • Paleozoic

References

Definition
Steiger E. (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

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.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.

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