Rueras-Gneiskomplex
Retour à nappe du TavetschReprésentation et statut
- Index
- G-T
- Couleur CMYK
- (0%,16%,16%,2%)
- Couleur RGB
- R: 220 G: 180 B: 160
- Rang
- Formation lithostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme informel
Nomenclature
- Deutsch
- Rueras-Gneiskomplex
- Français
- Complexe gneissique de Rueras
- Italiano
- Complesso gneissico di Rueras
- English
- Rueras Gneiss Complex
- Origine du nom
-
Rueras (GR), Tujetsch
- Variantes historiques
-
Paragneise + Paraschiefer (Niggli 1944), Rueras Gneiss Complex (Berger et al. 2017), Rueras-Gneiskomplex (Gisler 2018)
Description
- Description
-
Niggli 1944: Paragneis (inkl. Hornfles) + Paraschiefer (mit Quarzit) + Amphibolit/Grünschiefer + Ultrabasika
Âge
- Âge au sommet
-
- Paléozoïque
- Âge à la base
-
- Précambrien
Géographie
- Région-type
- Tujetsch (GR)
Références
- Définition
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.61: NIGGLI (1944) subdivided the metasedimentary gneisses into “Paragneise” and “Paraschiefer” to emphasise the important difference between these two rock types. The “Paragneise” show an Alpine overprint of pre-Alpine higher-grade metamorphic assemblages at upper greenschist-facies metamorphic conditions. Relics of such earlier parageneses, particularly in amphibolites and ultramafic rocks, allowed BIINO (1994, 1995) to reconstruct its pre-Alpine history. In contrast, the “Paraschiefer” were very strongly affected by a pervasive Alpine metamorphic and tectonic overprint at greenschist-facies conditions, completely obliterating previous mineral assemblages. On the present map sheet, these two types of metasedimentary gneisses were grouped together into the Rueras Gneiss Complex (GT).