Internes Aar-Massiv
Back to Aar MassifRepresentation and status
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic domain
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Internes Aar-Massiv
- Français
- Massif de l'Aar interne
- Italiano
- Massiccio dell'Aare interno
- English
- Internal Aar Massif
- Historical Variants
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internes Aar-Massiv (Sartori et al. 2017), Internal Aar Massif (TK500 / Gouffon et al. 2024)
Description
- Description
-
... südlich der Roti-Chüe-Gampel-Scherzone.
Hierarchy and sequence
References
- Definition
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.33: The Aar Massif and its autochthonous-parautochthonous sedimentary cover occupies a belt about 20 km wide and 160 km long in the central part of the Alps, between Sierre in Valais and Landquart in Graubünden. It is subdivided by several faults into a large External Aar Massif, making up almost the entire width of the Aar Massif in its central part, and a thinner Internal Aar Massif, which is subdivied into two submassifs: the Baldschieder-Gletsch Submassif, which crops out in upper Valais region, south of the Rote Kuh - Gampel Shear Zone – a reactivated paleofault – and its possible continuation between Aletsch and Rhône glaciers, and the Trun-Punteglias Submassif in the Surselva (Graubünden). North of the Lötschental, the External Aar Massif overthrusts the Gastern Submassif. The contact is marked by a thin band of Triassic and Jurassic sediments (the “Jungfrau Wedge”), which includes overturned sediments of the External Aar Massif. The entire Aar Massif is made up of a pre-Variscan to Variscan polycyclic metamorphic basement with Variscan intrusions. Several large-scale structures follow the general strike of the External Aar Massif. They include longitudinal faults and very tight synclines exposing Late Paleozoic and Mesozoic sediments.
The autochthonous cover of the Internal Aar Massif is present at its southwestern end near Raron (Baldschieder-Gletsch Submassif) while in the Trun-Punteglias Submassif only Triassic sediments remained attached to the crystalline basement.
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Plammis Nappe
- Name Origin
-
Plammis (VS), Alp oberhalb Varen
- Rank
- nappe
- Status
- valid
- Nomenclatorial Remarks
- <p>(inkl. autochthone Sedimentbedeckung des internen Aar-Massivs)</p>
- In short
-
The Plammis Nappe is a Lower Helvetic tectonic nappe of the Western Swiss Alps, constituted by a Jurassic sedimentary series interpreted as the detached part of the autochthonous cover of the Internal Aar Massif (Baldschieder-Gletsch Submassif). On the slopes between Sierre and Gampel, the Plammis Nappe overlies the autochthonous cover of the External Aar Massif and the Doldenhorn Nappe. It is itself overlain by the Jägerchrüz Nappe.
- Age
- Middle Jurassic
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Raron-Synklinale
- Name Origin
- Rank
- tectonic
- Status
- informal term
- In short
-
Gefaltete autochtone Sedimentbedeckung des internen Aar-Massivs.
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Baltschieder-Gletsch Submassif
- Name Origin
- Rank
- chronostratigraphic Subperiod
- Status
- local name (informal)
- In short
-
The Baltschieder-Gletsch Submassif represents the Internal Aar Massif in Valais. It crops out in upper Valais region, south of the Rote Kuh-Gampel Shear Zone – a reactivated paleofault – and its possible continuation between Aletsch and Rhône glaciers. The autochthonous cover of the Baldschieder-Gletsch Submassif is present at its southwestern end the near Raron.
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Ausserberg–Avat-Zone
- Name Origin
- Rank
- tectonic zone
- Status
- valid
- Nomenclatorial Remarks
- <p>Entspricht die «Südliche Gneiszone».</p>
- In short
-
Prävariszisches polyzyklisches Altkristallin des internen Aar-Massivs südlich des Zentralen Aare-Granits bzw. des Südwestlichen Aare-Granits.
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Engi-Granit
- Name Origin
-
Engi (VS) im Obergoms
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Stark deformierter porphyrischer alkalinischer Granit, der durch Migmatitisierung (Neosom) entstanden ist.
- Age
- Precambrian
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Gärsthorn-Gneiskomplex
- Name Origin
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszische polyzyklische granitische Gneise (Augengneis und grobkörniger Zweifeldspargneis) der Ausserberg-Avat-Zone.
- Age
- Precambrian
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Geimen-Augengneis
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- In short
-
Lokaler grobporphyrischer Augengneis innerhalb der Ausserberg-Avat-Zone.
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Bitschji-Augengneis
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- In short
-
Lokaler grauer granodioritischer Serizit-Augengneis innerhalb der Ausserberg-Avat-Zone.
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Sogn-Placi-Gneiskomplex
- Name Origin
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszische polyzyklische metasedimentäre Gneise (Meta-arkose, Metapsammite, Schiefer und Zweiglimmer-Phyllit) der östliche Ausserberg-Avat-Zone.
- Age
- Proterozoic
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Massa-Gneiskomplex
- Name Origin
- Rank
- lithostratigraphic Formation
- Status
- informal term
- In short
-
Prävariszische polyzyklische Migmatite und migmatitische Gneise der Ausserberg-Avat-Zone. Leukokratische migmatitische Gneise treten häufig mit mafische bis ultramafische Gesteine (Amphibolite, Gabbros, Hornblendite) zusammen und verleihen der Einheit ein gebändertes Aspekt.
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Pulanera-Gneiskomplex
- Name Origin
- Rank
- lithostratigraphic unit
- In short
-
Feinkörniger Biotitgneis bis -schiefer der östliche Ausserberg-Avat-Zone, z.T. gebändert, lokal migmatitisch.
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Trun-Punteglias-Teilmassiv
- Name Origin
-
Val Punteglias (GR), nördlich von Trun
- Rank
- tectonic unit
- Status
- valid
- In short
-
The Trun-Punteglias Submassif represents the Internal Aar Massif in the Surselva (Graubünden), with an autochthonous cover only comprising Triassic sediments.