Record details

Title
    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
Author
    Edel, Jean-Bernard
    Franěk, Jan
    Lexa, Ondrej
    Schulmann, Karel
    Tomek, Čestmír
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Metamorphic Geology
Vol./nr.
    Roč. 29, č. January
Pages
    26
Year
    2011
Thesaurus term
    exhumation, granulites, Moldanubian domain, orogenic lower crust, Variscan belt
Keyword
    Belt
    Core
    Crust
    Exhumation
    Extrusion
    High-pressure
    Hot
    Implications
    Large
    Lower
    Model
    Orogenic
    Orogens
    Rocks
    Syn-convergent
    Variscan
Abstract (in english)
   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.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014