Rueras-Gneiskomplex

Torna a Tavetsch

Rappresentazione e statuto

Index
G-T
Colore CMYK
(0%,16%,16%,2%)
Colore RGB
R: 220 G: 180 B: 160
Rango
Formazione litostratigrafica
Uso
Unità in uso.
Status
termine informale

Nomenclatura

Deutsch
Rueras-Gneiskomplex
Français
Complexe gneissique de Rueras
Italiano
Complesso gneissico di Rueras
English
Rueras Gneiss Complex
Origine del nome

Rueras (GR), Tujetsch

Varianti storiche

Paragneise + Paraschiefer (Niggli 1944), Rueras Gneiss Complex (Berger et al. 2017), Rueras-Gneiskomplex (Gisler 2018)

Descrizione

Descrizione

Niggli 1944: Paragneis (inkl. Hornfles) + Paraschiefer (mit Quarzit) + Amphibolit/Grünschiefer + Ultrabasika

Età

Geomorfologia
  • Paleozoico

Età alla base
  • Precambriano

Geografia

Regione-tipo
Tujetsch (GR)

Referenze

Definizione
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.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).

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