Paradis-Gneiskomplex

Representation and status

Index

GM-Au

Color CMYK

(0%,24%,30%,2%)

Color RGB

R: 250 G: 190 B: 175

Rank

lithostratigraphic unit

Validity

Unit is in Use

Status

informal term

Nomenclature

Deutsch

Paradis-Gneiskomplex

Français

Complexe gneissique du Piz Paradis

Italiano

Complesso Gneissico del Piz Paradis

English

Paradis Gneiss Complex

Origin of the Name

Piz Paradis (GR), Tujetsch

Historical Variants

(Homogene) Mischgneise auct., Mischgneis (Huber 1943, Niggli 1944), chorismatische Gneise auct., Injektionsgneise auct., Schmitzengneise, streifige Gneise p.p., Injektionsgneise p.p., Glimmerplagioklasgneise = Paradisgneise (Huber 1943a), Paradis-Gneis, Paradis Gneiss (von Raumer et al. 1993a), Migmatic gneiss unit = Paradisgneis (Mercolli et al. 1994), Prävariszische Migmatitgneise = Migmatitgneis des Val Medel (Vögeli et al. 2013), Paradis Gneiss Complex (Berger et al. 2017)

Description

Description

Mercolli et al. 1994: A particular typ of gneiss, associated with the migmatitic gneisses has been reporterd by Huber (1943) as "Paradisgneis". It is a rather massive mic-plagioclase gneiss, showing only a weak foliation and containing centimetric to decimetric inclusions of gneisses, amphibolites, quartz nodules and calc-silicate rocks.

Hierarchy and sequence

Subordinate units

• Oberstafel-Gneis
• Ganneretsch-Gneis
• Gneiss di Sorescia
• Val-Camadra-Migmatit
• Gneiss occhiadino della Val Gronda
• Anfibolite di Corandoni

Age

Age at top

• Cambrian

Age at base

• Precambrian

Dating Method

Protolit: Precambrien - Cambrien.

Palaenography and tectonic

• Pre-Variscan polycyclic basement of the Helvetic

Paleogeography

European continental plate

Tectonic unit (resp. main category)

• Gotthard

Kind of protolith

• sedimentary

Metamorphism

polycyclic

Metamorphic facies

• amphibolite facies
• granulite facies
• eclogite facies

Note on facies

Eklogit- und Granulit-Fazies (prae-Ordoviz), sowie Amphibolit-Fazies (variszisch).

References

Definition

Huber Heinrich M. (1943) : Physiographie und Genesis der Gesteine im südöstlichen Gotthardmassiv Schweiz. Min. Petr. Mitt. 23, 72-260

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.64: The Paradis Gneiss Complex consists of a large variety of migmatitic gneisses showing different degrees of partial melting and resulting in a wide range of textures(*). Again, a number of local names were used to designate these migmatitic rocks (see Tab. 3). HUBER (1943) and NIGGLI (1944) described them very carefully and interpreted them correctly, but systematically omitted the term “migmatite”. Frequent gradual transitions between the metasedimentary Val Nalps Gneiss Complex and the migmatitic Paradis Gneiss Complex suggest a coeval Ordovician metamorphic evolution of the two units.

(*) The narrow migmatite bands of the Val Uffiern–Val Camadra could not be displayed at the scale of the present map sheet. For the exact locations of these bands the reader is referred to BAUMER et al.(2013).