Blattengrat-Decke
Representation and status
- Color CMYK
- N/A
- Color RGB
- R: 241 G: 239 B: 237
- Rank
- nappe
- Validity
- Unit is in Use
- Status
- valid
Nomenclature
- Deutsch
- Blattengrat-Decke
- Français
- Nappe du Blattengrat
- Italiano
- Falda del Blattengrat
- English
- Blattengrat Nappe
- Origin of the Name
-
Blattengrat = Plattengrat (GL), NE Fanenstock
- Historical Variants
-
Blattengrat unit = Blattengrat Schichtfolge (Lihou 1995), Blattengrat-Schuppenzone, Blattengrat-Decke (Hantke et al. 2019, den Brok et al. 2021), Blattengrat Nappe (TK500 / Gouffon et al. 2024)
Description
- Description
-
Decke (bzw. Schuppenzone) südhelvetischer Herkunft, die zwischen den nordhelvetischen Parautochthon und die ultrahelvetische Sardona-Decke «eingewickelt» ist. Stratigraphisch durch normale südhelvetische spätkretazischen (Amden- und Wang-Fm.) und paläogenen (Stad-Fm.) mergeligen Ablagerungen charakterisiert. Die zwischengelagerten Nummulitenkalken vom «Einsiedler Typus» gehen lokal in klastischen Bänken (Batöni-Sandstein) über.
Hierarchy and sequence
- Units at roof
- Units at floor
- Upper boundary
-
Oberhelvetikum (via Glarner Hauptübershiebung)
- Lower boundary
-
Unterhelvetikum bzw. subhelvetische Elemente
Age
- Age at top
-
- Eocene
- Age at base
-
- Late Cretaceous
Geography
- Geographical extent
- Zwischen Linth- und Rheintal: Weisstannental, Sernftal.
Palaenography and tectonic
- Paleogeography
- South Helvetic Domain
- 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.36: Three allochthonous units, which were emplaced in an early phase onto the future Helvetic domain (see p. 31), crop out in the area between Linthal and Sargans. They are composed mainly of Late Cretaceous to Paleogene sediments deposited in the very distal part of the Helvetic realm: Blattengrat and Bad Ragaz nappes of South Helvetic, Sardona Nappe of Ultrahelvetic affinity. The three units were subsequently truncated by the Glarus Thrust, which is the basal thrust of the Upper Helvetic subdomain, and simultaneously cut by out-of-sequence thrusts also involving both the basement and the cover of the Aar Massif (see § 4.1.1, Fig. 5).