Podrobnosti záznamu

Název
    Model of syn-convergent extrusion of orogenic lower crust in the core of the Variscan belt: implications for exhumation of high-pressure rocks in large hot orogens
Autor
    Edel, Jean-Bernard
    Franěk, Jan
    Lexa, Ondrej
    Schulmann, Karel
    Tomek, Čestmír
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of Metamorphic Geology
Svazek/č.
    Roč. 29, č. January
Strany
    26
Rok
    2011
Výraz tezauru
    exhumation, granulites, Moldanubian domain, orogenic lower crust, Variscan belt
Klíčové slovo
    Belt
    Core
    Crust
    Exhumation
    Extrusion
    High-pressure
    Hot
    Implications
    Large
    Lower
    Model
    Orogenic
    Orogens
    Rocks
    Syn-convergent
    Variscan
Abstrakt (anglicky)
   Reflection seismic section, field structural analysis and gravimetric modelling of orogenic lower crust in the core of a Carboniferous orogenic root reveal details of the polyphase process of exhumation. Surface exposures of granulites coincide with the absence of subhorizontal seismic reflectors at depth, suggesting preservation of the 20 km wide subvertical tabular structure reaching Moho depths. Horizontal seismic reflectors surrounding the vertical channel structure corroborate a dominant flat migmatitic fabric developed in all tectonic units. The horizontal mid-crustal flow resulted in collapse of the supra-crustal Teplá -Barrandian Unit (interpreted as the orogenic lid) along a large-scale crustal detachment above the extruded lower crustal dome. The presence of felsic granulites at the bottom of the orogenic root is considered to be a key factor controlling the exhumation of orogenic lower crust in large hot orogens.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014