Goms-Gneiskomplex

Representation and status

Index

G-Go

Color CMYK

(0%,16%,16%,2%)

Color RGB

R: 250 G: 210 B: 210

Rank

lithostratigraphic Formation

Validity

Unit is in Use

Status

informal term

Nomenclature

Deutsch

Goms-Gneiskomplex

Français

Complexe gneissique de Goms

Italiano

Complesso gneissico di Goms

English

Goms Gneiss Complex

Origin of the Name

Goms (VS)

Historical Variants

Goms Gneiss Complex (Berger et al. 2017)

Hierarchy and sequence

Subordinate units

• Unterwassern-Gneis

Age

Age at top

• Paleozoic

Age at base

• Precambrian

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.67: Following OBERHOLZER (1955), the two slices of polycyclic gneisses were depicted on the present map but, due to the map scale, these two lithologically distinguished units were grouped into one single unit called the Goms Gneiss Complex. OBERHOLZER (1955) described two-mica plagioclase K-feldspar gneiss, migmatite (“Mischgneise”) and biotite-plagioclase gneiss derived from sedimentary protoliths intercalated with amphibolitic layers and a serpentinite lens. These rock associations are very similar to sequences in the “Streifengneis” Complex, Paradis Gneiss Complex and the Val Nalps Gneiss Complex of the adjacent Ausserbinn-Piz Cavel Zone of the Gotthard Nappe. Noteworthy is a strong alteration of the gneisses in the region of Ernen and an epidote- and chlorite-rich metagranodiorite (“Gneis von Unterwasser”, OBERHOLZER 1955).

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