Podrobnosti záznamu

Název
    Palaeozoic orogeneses in the Sudetes: a geodynamic model
Údaj o odpovědnosti
    Zbigniew Cymerman
Autor
    Cymerman, Zbigniew
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geological quarterly
Svazek/č.
    Vol. 44, no. 1
Strany
    p. 59-80
Rok
    2000
Poznámky
    6 obr., 7 pl.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Geol. Quart.
Předmětová skupina
    akrece
    bohemikum
    deformace duktilní
    kinematika
    kolize desek
    metamorfika
    moldanubikum
    paleozoikum
    saxothuringikum
    střih
    terán
    vrásnění kaledonské
    vrásnění variské
    západosudetská oblast
Geografické jméno
    Česká republika
    Polsko - jihozápad
Klíčové slovo
    Geodynamic
    Model
    Orogeneses
    Palaeozoic
    Sudetes
Abstrakt (anglicky)
   The Palaeozoic geodynamic evolution of the Sudetes resulted from two successive orogenic events: (1) Ordovician-Silurian geotectonic processes (pre-Variscan stages), and (2) the Variscan orogeny. Early Palaeozoic rifting of Cadomian crustal segments and opening of the Ligerian (Galicia-Maassif Central) and/or Saxothuringian Ocean occurred in Ordovician-Silurian times on the northern (peri-Gondwana) periphery of the Bohemian Massif. At the same time, the Góry Sowie terrane with magmatic arc affinity quite probably developed on the SW margin of Baltica due to subduction of the Tornquist Ocean. Two major structural events characterized the Variscan evolution of the Sudetes: (1) regional-scale ductile thrusting of Late Devonian-Early Carboniferous age, and (2) Early Carboniferous-Early Permian regional extension.
   Ductile thrusting is characterised by: (I) a general NNE-directed, dextral transpressional stacking of ductile nappes due to oblique collision of the Moldanubian and Moravian microplates in the eastern Sudetes, and (II) SW- to NW-directed, sinistral transpressional stacking of ductile nappes due to westward lateral extrusion of continental crust in the Central and Western Sudetes, itself a result of oblique indentation of the Central Sudetic oceanic lithosphere. The first Variscan deformation in the Sudetes might reflect a purely convergent setting that envolved into a transpressive setting during oblique convergence. Special attention is given to the geometry and kinematics of intraplate tectonic escape and a model of indentation proceses in the Sudetes. The presented new geotectonic model for the Variscan strain in the NE part of the Bohemian Massif.
   This model explains the lateral expulsion (escape) process as due to the indentation of the Central Sudetic terrane along with the Góry Sowie terrane and by the oblique subduction of the Ligerian/Saxothuringian Ocean(s) (now tectonically dismembered ophiolitic rocks of the Central Sudetic terrane)
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    13. 11. 2006
Datum importu
    8. 8. 2012