Fulltext

Structure, geometry and kinematics of the northern Adula nappe (Central Alps)

Cavargna-Sani, Mattia ; Epard, Jean-Luc ; Steck, Albrecht

In: Swiss Journal of Geosciences, 2014, vol. 107, no. 2-3, p. 135-156

Zum persönliche Liste hinzufügen
    Titel
    • Structure, geometry and kinematics of the northern Adula nappe (Central Alps)
    Autor
    • Cavargna-Sani, Mattia. Institut des sciences de la Terre, Faculté des Géosciences et de l'Environnement, Bâtiment Géopolis, Université de Lausanne, 1015, Lausanne, Switzerland
    • Epard, Jean-Luc. Institut des sciences de la Terre, Faculté des Géosciences et de l'Environnement, Bâtiment Géopolis, Université de Lausanne, 1015, Lausanne, Switzerland
    • Steck, Albrecht. Institut des sciences de la Terre, Faculté des Géosciences et de l'Environnement, Bâtiment Géopolis, Université de Lausanne, 1015, Lausanne, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Swiss Journal of Geosciences, 2014, vol. 107, no. 2-3, p. 135-156. Springer Basel
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:325505
    Summary
    The eclogitic Adula nappe of the Central Alps (cantons Graubünden and Ticino, Switzerland) displays an exceptionally complex internal structure with the particularity of enclosing numerous slices of Mesozoic cover rocks (Internal Mesozoic) within the Palaeozoic gneiss basement. This study is principally based on detailed lithological and structural mapping of selected areas of the northern Adula nappe. Specific focus was placed on the Mesozoic slivers embedded in pre-Mesozoic basement (Internal Mesozoic). The most pervasive structures are related to the Zapport deformation phase that is responsible for the development of a fold-nappe and ubiquitous north-directed shear. Locally, the structures in the upper and frontal part of the nappe can be assigned to the older ductile Ursprung phase. These earlier structures are only compatible with top-to-S shear movement. The superposition of the Ursprung and Zapport phases is responsible for the north-dipping internal duplex-like structure and the sliced aspect of the Northern and Central Adula nappe. We conclude that the Adula nappe represents a major shear zone involving the entire nappe and responsible for the emplacement of the Lower Penninic sediments and the Middle Penninic nappes in the eastern part of the Lepontine Dome.