Record details

Title
    Subsurface distribution and tectonic setting of the late-Variscan granites in the northwestern Bohemian Massif
Statement of responsibility
    Robert Trzebski, H. J. Behr, W. Conrad
Other titles
    The German deep drilling project, KTB (Variant.)
Author
    Behr, H. J.
    Conrad, W.
    Trzebski, Robert
Language
    anglicky
Source title - serial
    Geologische Rundschau
Vol./nr.
    Vol. 86, no. Suppl.
Pages
    p. 64-78
Year
    1997
Notes
    12 obr., 2 tab., 2 s.bibl.
    Zkr. název ser.: Geol. Rdsch.
Subject group
    geologie hlubinná
    granitoidy
    gravimetrie
    moldanubikum Českého lesa
    saxothuringikum
    vmístění
    vrásnění variské
    zóna střižná
    zóna zlomová
Geographical name
    Bor
    ČR-Čechy
    Mariánské Lázně
    Rozvadov (Tachov)
    SRN-Bayern
    Tachov
Keyword
    Bohemian
    Distribution
    Granites
    Late-Variscan
    Massif
    Northwestern
    Setting
    Subsurface
    Tectonic
Abstract (in english)
   Integrative gravity modelling reveals the 3D shape, subsurface extent and basal morphology of the late-Variscan granites in the northwestern Bohemian Massif. The combination of the results with structural and geochronological data enables to interpretation of the morphogenesis and the tectonic setting of the granite emplacement. For the subsurface shaping two gravity methods were used: the Linsser filtering and the 2.5 density modelling. At depth, the granites show steep and flat-sided, wedge-like plutons which are generally elongated in NNW-SSE direction. The maximum basal depths between 3 and 8 km occur along the root zones indicated by high gravity magnitudes. The density contrasts are caused by steep faults which enabled the emplacement of the granites. The shape, basal morphology, depth and volume of the plutons presume a genetic link between magma intrusion and shear deformation.
   However, the orientation of the plutons 15-20° off the trend of the major faults and structural data suggest emplacement into opening fractures along initially transtensional faults owing to the Lower to Upper Carboniferous extension in the northwestern Bohemian Massif
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    17. 8. 2007
Import date
    8. 8. 2012