Massa-Gneiskomplex

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Representation and status

Index
GM-M
Color CMYK
(0%,24%,30%,2%)
Color RGB
R: 250 G: 190 B: 175
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Massa-Gneiskomplex
Français
Complexe gneissique de la Massa
Italiano
Complesso gneissico della Massa
English
Massa Gneiss Complex
Origin of the Name

Untere Massaschlucht (VS)

Historical Variants

Hauptmigmatitzone von Gletsch (Niggli 1965a), Massa Gneiss Complex (Berger et al. 2017)

Geography

Geographical extent
Zwischen Baltschiedertal und Oberalppass.
Point of interest
  • St. Niklaus (VS) im Obergoms
    Site particularities
    • spezielle Fazies
    Site accessibility
    • Strassenanschnitt / Bahnanschnitt
    Coordinates
    • (2670670 / 1154910)
    Note
    • Injektionseruptivbreccien (GFS 1934)

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.25: The migmatite and migmatitic gneiss forming the Massa Gneiss Complex are common in the Ausserberg-Avat Zone and show different aspects. In particular, the association of leucocratic migmatitic gneisses with mafic to ultramafic rocks (amphibolites, gabbroic rocks, hornblendites) is widespread (LABHART 1965, NIGGLI 1965, STECK 1966). This produces banded assemblages strongly resembling the sequences found in the Ofenhorn-Stampfhorn Gneiss Complex of the Sustenhorn Zone (ABRECHT 1994).
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