Obere Stalden-Decke
Representation and status
- Index
- OS
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- tectonic zone
- Validity
- Unit is in Use
- Status
- valid
- Status discussion
Nomenclature
- Deutsch
- Obere Stalden-Decke
- Français
- Nappe de Stalden supérieure
- Italiano
- Falda di Stalden superiore
- English
- Upper Stalden Nappe
- Origin of the Name
- Historical Variants
-
Zone de Stalden supérieure (Bearth 1963, Jeanbourquin & Burri 1989), Oberer Staldener Lappen (Bearth 1973, Müller 1983), zone de Stalden supérieure (Ackermann et al. 1991), Obere Stalden-Zone (Sartori et al. 2017), Upper Stalden Nappe (TK500, Gouffon et al. 2024)
Description
- Description
-
Einheit aus mindestens teilweise polymetamorphen Gneisen, die sich gegen Süden weiter ausdehnt (cf. Ruitor und/oder Berisal).
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- tectonic
References
- Definition
-
(2024) :
Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern
p.64: In the upper Valais region, between Visp and the Simplonpass, the Upper Stalden Nappe is similar in structural position to the Ruitor Nappe – between the Zone Houillère and the Siviez-Mischabel Nappe – and is composed of a crystalline basement identical to that of this nappe, but without sedimentary cover. However, Genier et al. (2008) interpreted the Permian contact of the lower limb of the St. Niklaus syncline (§ 6.2.2.3) as autochthonous and thus linked the Upper Stalden Nappe to the lower part of the Siviez-Mischabel Nappe through that fold.
Escher (1988) grouped the Ruitor and Upper Stalden nappes with a “Pontis Slice” (south of Sierre, comprising mainly Triassic limestones) under the name of “Pontis Nappe”. It turns out that this “Pontis Slice” belongs to the Zone Houillère, so the term “Pontis Nappe” has to be abandoned (Sartori et al. 2006).