Record details

Title
    Formation of elongated granite-migmatite domes as isostaticaccommodation structures in collisional orogensKry
Author
    Finger, F.
    Johnson, K.
    Machek, Matěj
    Paclíková, J.
    Šrámek, F.
    Verner, K.
    Zavřelová, A.
    Žák, J.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Journal of Geodynamics
Vol./nr.
    Roč. 73, January
Pages
    s. 100-117
Year
    2014
Notes
    Rozsah: 18 s.
Subject category
    anisotropy of magnetic susceptibility
    Bohemian Massif
    exhumation
    granite-migmatite dome
    metamorphic core complex
Keyword
    Collisional
    Domes
    Elongated
    Formation
    Granite-migmatite
    Isostaticaccommodation
    OrogensKry
    Structures
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.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    23. 10. 2014