Guttannen-Gneiskomplex

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Representation and status

Index
G-G
Color CMYK
(0%,16%,16%,2%)
Color RGB
R: 250 G: 190 B: 175
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term

Nomenclature

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

Guttannen (BE)

Historical Variants

Gneiss von Guttannen (Fellenberg & Schmidt 1898), Paragneise der Zone von Guttannen, Guttannen Zone (Abrecht & Schaltegger 1988), Guttannen Gneiss Complex (Berger et al. 2017)

Description

Description

Biotitgneis und Bändergneis, uneinheitlich ausgebildet, oft migmatisch und mit ptygmatischer Verfältelung; aplitische Mobilisate mit dunklen Feldspäten; Biotit-Sericit-Schiefer mit Relikten von Amphibolit und Quarzit.

Age

Age at top
  • Paleozoic
Age at base
  • Precambrian

Palaenography and tectonic

  • Pre-Variscan polycyclic basement of the Helvetic
Paleogeography
European Continent
Tectonic unit (resp. main category)

References

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.28: The Guttannen Gneiss Complex best represents the typical rock associations of the Ferden-Guttannen Zone. Biotite-chlorite and chlorite-sericite schists dominate in the “Guttannen Zone” of ABRECHT & SCHALTEGGER (1988), called here the Guttannen Gneiss Complex. These greenschist-facies mineral assemblages overprint higher-grade parageneses (e.g., sericite after sillimanite). Towards the southern border of the gneiss complex, the retrograde alteration gradually diminishes and the original migmatitic character appears (ABRECHT 1994).

Material and varia

Images
Guttannen_cliff.jpg
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