Record details

    Formation of elongated granite-migmatite domes as isostaticaccommodation structures in collisional orogensKry
    Finger, F.
    Johnson, K.
    Machek, Matěj
    Paclíková, J.
    Šrámek, F.
    Verner, K.
    Zavřelová, A.
    Žák, J.
Publication type
    článek v odborném periodiku
Source title - serial
    Journal of Geodynamics
    Roč. 73, January
    s. 100-117
    Rozsah: 18 s.
Subject category
    anisotropy of magnetic susceptibility
    Bohemian Massif
    granite-migmatite dome
    metamorphic core complex
Abstract (in english)
   The mid-Carboniferous Pelhřimov core complex, Bohemian Massif, is a crustal-scale elongated granite-migmatite dome interpreted to have formed by gravity-driven diapiric upwelling of the metapelitic middle crust. The vertical diapiric flow is evidenced by outward-dipping foliation and lineation patterns, deformation coeval with the widespread presence of melt, rapid exhumation of the dome center from depths corresponding to pressure of about 0.6 GPa to shallow levels (pressure less than 0.2 GPa) within 2 M.y., and kinematic indicators of downward return flow of the mantling rocks. As compared to common diapirs, however, the Pelhřimov complex exhibits a more complicated inferred strain pattern with two perpendicular, irregularly alternating directions of horizontal extension in what is interpreted as the diapir head.
   Comparison of structural data from migmatites with anisotropy of magnetic susceptibility (AMS) data in granites also reveals that only final increments of strain are recorded in the granites.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    23. 10. 2014