Falda della Maggia

Représentation et statut

Couleur CMYK

N/A

Couleur RGB

R: 241 G: 239 B: 237

Rang

nappe

Usage

Ce terme est en usage.

Status

valide

Nomenclature

Deutsch

Maggia-Decke

Français

Nappe de la Maggia

Italiano

Falda della Maggia

English

Maggia Nappe

Origine du nom

Valle Maggia (TI)

Variantes historiques

Maggia-Lappen (Niggli et al. 1936, Günthert 1954, Günthert 1958), lembo della Maggia (Hermann 1937), Maggia-Komplex (Kobe 1956), lobo della Maggia (Bianconi 1971), falda Maggia, unità di basamento della Maggia (Dal Piaz et al. 1992a), Falda della Maggia (Della Torre & Maggini 2015), falda della Maggia (Schenker, Bl. Osogna)

Remarques nomenclatoriales

Maggia stem = Maggia s.s.

Description

Description

Paragneis und variszische Intrusivkörper.

Hiérarchie et succession

Limite supérieure

Lebendun-Decke bzw. Bedretto-Zone

Limite inférieure

Antigorio-Decke

Géographie

Extension géographique

Lepontin zwischen Val Bedretto und Lago Maggiore.

Région-type

Valle Maggia

Paléogéographie et tectonique

Paléogéographie

domaine sud-helvétique

Termes génériques

• Maggia

Références

Révision

Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.49: The Maggia and Sambuco nappes occupy the NNW–SSE oriented transverse synformal zone in the middle of the structural Lepontine Dome, but are not in cartographic continuity. These two units are made up of similar basement rocks intruded by Variscan granitoids (Late Carboniferous) but, in contrast to the Maggia Nappe, the Sambuco Nappe has a thin sedimentary cover, the facies of which have a Helvetic affinity (Steck et al. 2019). These units have undergone polyphase deformation (e. g., Maxelon & Mancktelow 2005) which makes the interpretation of their relationships with each other and with adjacent units difficult. Some authors see them as structurally continuous, at the top of the nappe stack, others as tectonically distinct units, at different structural levels (see discussion in Berger et al. 2005a, Steck et al. 2013, 2019). Some authors (e. g., Berger et al. 2005a, Schmid et al. 2004) consider these two nappes as Middle Penninic because they are located above units originating from a subduction zone (Cima Lunga Nappe and Mergoscia Zone), implying a Briançonnais origin. This upper position is contested by Maxelon & Mancktelow (2005) and Steck et al. (2019). Moreover, their sedimentary cover and the latest Carboniferous age of their magmatic rocks are more in concordance with a paleogeographic origin in the European margin that justifies placing the Maggia and Sambuco nappes in the Lepontic domain. In addition, by grouping the Simano and the Cima Lunga nappes (§ 5.8), Tagliaferri et al. (2023) proposed the existence of a lateral continuity between the Maggia Nappe and the Adula Nappe.