The Soja and Luzzone-Terri nappes: discovery of a Briançonnais element below the front of the Adula nappe (NE Ticino, Central Alps)

Détails

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Etat: Serval
Version: Author's accepted manuscript
ID Serval
serval:BIB_8ECE9B0810F9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The Soja and Luzzone-Terri nappes: discovery of a Briançonnais element below the front of the Adula nappe (NE Ticino, Central Alps)
Périodique
Bulletin de la Société Vaudoise des Sciences Naturelles
Auteur(s)
Galster F., Epard J.-L., Masson H.
ISSN-L
0037-9603
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
92
Pages
61-75
Langue
anglais
Résumé
The classical Soja nappe, in NE Ticino, actually consists of two distinct tectonic units with verydifferent stratigraphic contents: (1) The smaller one, in the Val Soi (the type-locality), is by definitionthe Soja unit s.str.. It is pinched between Simano and Adula and consists of various Paleozoic gneissesand a dolomitic Triassic cover analogous to the Triassic of other Lower Penninic nappes. (2) The largerone extends along the Lago di Luzzone and continues eastwards through the Piz Terri mountain. Wename it the Luzzone-Terri nappe. It consists of: (a) a paragneiss series that presents striking similaritieswith the Permian of the Zone Houillère in Valais; (b) a Triassic cover typical of the Briançonnaisdomain where one clearly recognizes the St-Triphon Formation and other characteristic units of theBriançonnais Triassic; (c) a thick series of black calcschists and metapelites of Liassic age, similarto the cover of the neighbouring Gotthard massif. This stratigraphic superposition of a Liassic seriesof Helvetic type on a Briançonnais Triassic is unique in the Alps and has important paleogeographicconsequences. It is difficult to reconcile this observation with speculative reconstructions that proposean original position of the Briançonnais domain far from the Helvetic basins. Morover the Briançonnaischaracter of its Triassic series indicates an ultra-Adula origin of the Luzzone-Terri nappe.
Mots-clé
Soja, Luzzone, Piz Terri, Adula, Ticino, Penninic, Briançonnais Triassic, Central Alps
Création de la notice
06/06/2011 18:57
Dernière modification de la notice
03/03/2018 19:19
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