Drauzug-Gurktal-Deckensystem
Darstellung und Status
- Farbe RGB
- R: 241 G: 239 B: 237
- Rang
- Deckenkomplex
- Gebrauch
- Element ist nicht in Gebrauch
- Status
- informeller Begriff
Nomenklatur
- Deutsch
- Drauzug-Gurktal-Deckensystem
- Français
- Système de nappes du Drauzug-Gurktal
- Italiano
- Sistemo di galde del Drauzug-Gurktal
- English
- Drauzug-Gurktal Nappe System
- Historische Varianten
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Drauzug-Gurktal Nappe System (TK500 / Gouffon et al. 2024)
Hierarchie und Abfolge
- Untergeordnete Einheiten
Paläogeografie und Tektonik
- Tektonische Einheit (bzw. Überbegriff)
- Herkunftstyp
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- tektonisch
- Metamorphose
- unmetamorph
Referenzen
- Neubearbeitung
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(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.90: In Austria, tectonic units are generally grouped into nappe systems; this is not the case in this map. This effects the following nappes: 1) The Silvretta-Seckau Nappe System comprises the Languard, S-charl - Sesvenna and Silvretta nappes as well as the Campo Nappe Complex, 2) the tectonically higher Ötztal-Bundschuh Nappe System is represented only by the Ötztal Nappe Complex, 3) although the Tonale Nappe lacks a Mesozoic cover, it is attributed to the still higher Drauzug-Gurktal Nappe System which is not affected by the Alpine metamorphic overprint (Schmid et al. 2004). Note that the Silvretta Nappe, the S-charl - Sesvenna Nappe and the Campo Nappe Complex, all being part of the Silvretta-Seckau Nappe System, essentially occupy the same position within the Upper Austroalpine nappe stack (Froitzheim et al. 1994). Other units, consisting predominantly of cover sequences detached from the S-charl - Sesvenna Nappe and the Campo Nappe Complex (Ortler and Quattervals nappes, Umbrail-Terza Slice Complex), are transported towards the WNW, below the advancing Ötztal Nappe Complex (Froitzheim et al. 1994, Conti 1997, Trümpy et al. 1997).
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Falda del Tonale
- Name Origin
- Rang
- tektonisch-begrenzte lithostratigrafische Einheit
- Status
- gültig
- Kurzbeschreibung
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The Tonale Nappe follows the E–W striking part of the Tonale Fault (Insubric Fault) and is is characterized by a very distinct and lithologically variable association of predominantly sillimanite-bearing paragneisses, marbles, quartzites and amphibolites metamorphosed during the Variscan cycle (Tonale Gneiss Complex).
In the west, between Giubasco and Sondrio, the Tonale Nappe forms a steeply N-dipping narrow strip of mylonitic series that are part of the Southern Steep Belt (or “root zone” north of the Tonale Fault), bounded by the tonalites of the Bregaglia Intrusion to the north and Alpine mylonites and cataclasites of the Tonale Fault in the south. Between Sondrio and Tirano, it then represents the hangingwall of the Late Cretaceous Mortirolo Normal Fault. Further east, a second Late Cretaceous normal fault, the SE-dipping Pejo Normal Fault, accommodates top-E extension combined with a sinistral strike-slip component in the present-day map view. Finally, east of the Passo del Tonale, the Tonale Nappe displays a rock association that is lithologically distinct from the Tonale Gneiss Complex and that is referred to as the Ulten (or Ultimo) Unit. It overlies the Tonale Gneiss Complex along a pre-Alpine tectonic contact.
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Ulten-Einheit
- Rang
- tektonische Einheit
- Status
- gültig
- Kurzbeschreibung
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East of Val di Peio (Mezzana region), the Ulten Unit overlies the Tonale Gneiss Complex along a pre-Alpine tectonic contact. It is characterized by kyanite-bearing paragneisses and migmatites, containing boudins of amphibolitized eclogites, metagabbros and peridotites. Its metamorphic history (high-pressure event of unknown age, exhumation to a lower crustal depth between Devonian and Carboniferous times, slow cooling during Permian to Jurassic times), as well as its original location in the lower crust within the Variscan orogen, are reminiscent of the Ivrea Zone located south of the Tonale Fault.