Record details

    Timing of Palaeozoic magmatism in the Maggia and Sambucco nappes and paleogeographic implications (Central Lepontine Alps)
    Bussien, Denise
    Bussy, Francois
    Magna, Tomáš
    Masson, Henri
Publication type
    článek v periodiku
Source title - serial
    Swiss Journal of Geosciences
    Roč. 104, č. 1
Thesaurus term
    LA-ICPMS,U-Pb dating,zircon,granite,Variscan,Penninic,Swiss Alps
Abstract (in english)
   Magmatic rocks from the pre-Mesozoic basements of the Sambuco and Maggia nappes have been dated by U-Pb zircon ages with the LA-ICPMS technique. Several magmatic events have been identified in the Sambuco nappe and the Cocco granodiorite and Rüscada leucogranite yielded ages of ca. 300-310 Ma; they are significantly older than former age determinations. The age coincidence strongly suggests paleogeographic proximity of the Sambuco and Maggia nappes in Late Carboniferous times. These two nappes have been interpreted as belonging to distinct Mesozoic paleogeographic domains: 'European' for Sambuco and 'Brianconnais' for Maggia, separated by the 'Valais' oceanic basin. In this case, the similarity of the Matorello and Cocco intrusions would demonstrate the absence of any significant transcurrent movement between these two continental domains. Alternatively, according to a more traditional view, Sambuco and Maggia might belong to a single large Alpine tectonic unit.
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
Import date
    15. 10. 2014