Podrobnosti záznamu

Název
    A model for a continental accretionary wedge developed by oblique collision: the NE Bohemian Massif
Údaj o odpovědnosti
    Karel Schulmann, Rodney Gayer
Autor
    Gayer, Rodney
    Schulmann, Karel
Jazyk
    anglicky
Zdrojový dokument - seriál
    Journal of the Geological society
Svazek/č.
    Vol. 157, no. 2
Strany
    p. 401-416
Rok
    2000
Poznámky
    9 obr., 42 bibl.
    il.
    Zkr. název ser.: J. Geol. Soc. (Bath)
Předmětová skupina
    akrece
    deformace
    devon
    geologie strukturní
    karbon-spodní
    kolize desek
    metamorfóza
    moravskoslezská oblast
    příkrov
    vrásnění variské
Geografické jméno
    ČR-Morava
Klíčové slovo
    Accretionary
    Bohemian
    Collision
    Continental
    Developed
    Massif
    Model
    NE
    Oblique
    Wedge
Abstrakt (anglicky)
   Structural and metamorphic investigations of the northeastern margin of the Bohemian Massif indicate three main sequential Devonian-Carboniferous tectonic events: (1) Devonian rifting; (2) Early Carboniferous oblique underthrusting and formation of a continental accretionary wedge; (3) eduction of the wedge and Late Carboniferous transpression. Devonian rifting of the Brunia microcontinent resulted in the formation of two crustal-scale boundins associated with the development of two syn-rift Devonian basins. This extensional template strongly influenced the nature of the ensuing Variscan contractional deformation. Early Carboniferous (350-330 Ma), progressive, highy oblique underthrusting of the two crustal boundins beneath the Lugian terrane to the west, generated syn-deformation Barrovian metamorphism and the formation of a continental accretionary wedge.
   The wedge was further compressed by continued underthrusting of Brunia which resulted in the successive vertical extrusion (eduction) of an upper and lower allochthon, derived from the more deeply underthrust crustal boundin. The eduction was terminated by a Late Carboniferous (330-310 Ma) transpressional event resulting from continued plate convergence. Release of mantle-derived magma during late-stage eduction thermally softened the transpressional zones in the more external parts of the wedge. The resultant differential displacements gave rise to extensional unroofing of the internal part of the wedge
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    9. 11. 2006
Datum importu
    8. 8. 2012