Record details

    Palaeozoic terrane amalgamation in Central Europe: a REE and Sm-Nd isotope study of the pre-Variscan basement, NE Bohemian Massif
Statement of responsibility
    Quentin G. Crowley, Hilke Timmermann, Stephen R. Noble, J. Grenville Holland
Other titles
    Palaeozoic Amalgamation of Central Europe (Variant.)
    Crowley, Quentin G.
    Holland, J. Grenville
    Noble, Stephen R.
    Timmermann, Hilke
Source title - serial
    Geological society special publication
    Vol. 201
    p. 157-176
    6 obr., 2 tab., 5 s. bibl.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Subject group
    datování Sm/Nd
    krkonošsko-jizerské krystalinikum
    původ korový
    vrásnění variské
    vzácné zeminy
Geographical name
    Mariánské Lázně (Cheb)
    Polsko - jihozápad
Abstract (in english)
   The West Sudetes, NE Bohemian Massif, comprises several suspect terranes accreted to the margins of Laurussia during Variscan orogenesis. Whole rock REE and Sm-Nd isotope data for seven separate provinces (Izera, Kaczawa, Rudawy Janowickie and Klodzko complexes; Fore-Sudetic and Góry Sowie Blocks; Sleza Ophiolite) suggest involvement of a variety of crustal and mantle sources. Felsic metasedimentary rocks (epsilonNd(t) = -8.3 to -5.0) have two stage TDM ages of 1.9 to 1.5 Ga, whereas acidic metavolcanic rocks and granite gneisses (epsilonNd(t) = -5.4 to +0.8) have two stage TDM ages of 1.5 to 1.0 Ga. A range of sources is implicated: predominantly Archaean and Palaeoproterozoic sources for the metasedimentary rocks, and Archaean, Palaeoproterozoic and Neoproterozoic to early Palaeozoic sources for the meta-igneous felsic lithologies.
   LREE depleted tholeiitic metabasites ((Ce/Yb)N = 0.8 to 3.4) generally have eNd(t) = +4.0 to +9.1, indicating derivation from depleted mantle asthenosphere. LREE enriched meta-alkali basalts ((Ce/Yb)N = 4.6 to 10.1) with eNd(t) between +3.1 and +7.0 implicate utilization of enriched mantle asthenosphere. Analogous lithologies from elsewhere in the Sudetes, North Bohemian Massif and the Armorican Terrane Assemblage have similar REE abundances, epsilonNd values and TDM ages. Complexes previously considered to have had disparate Neoproterozoic to early Palaeozoic histories may be integrated into a unifying geodynamic model of derivation from the North Gondwanan (North African) margin during a widespread episode of continental margin break-up
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    24. 10. 2007
Import date
    8. 8. 2012