Record details

    Perpendicular linear fabrics in granite: markers of combined simple shear and pure shear flows : qranite: From Segregation of Melt to Emplacement Fabrics
Statement of responsibility
    Karel Schulmann, Josef Ježek, Zdeněk Venera
    Ježek, Josef
    Schulmann, Karel
    Venera, Zdeněk
Source title - serial
    Petrology struct. Geol.
    Vol. 8
    p. 159-176
    10 obr., 1 fot.
Subject group
    analýza petrotektonická
    model matematický
Geographical name
Abstract (in english)
   Recent results of numerical modelling of crystallographic fabrics of biotite and feldspar found in the porphyritic granite of the borehole EPS-1 at Soultz-sous-Foret, France, are described and interpreted. Preferred orientations of biotite (001) planes and feldspar (010) and (100) cleavages, were measued by means of an optical goniometer. The poles of (001) biotites show stable orientations throughout the core with maximum eigenvector v1 oriented in the NE-SW direction. Within the subhorizontal magmatic foliation plane, also defined by feldspar (010) planes, two mutually orthogonal linear fabrics were found to be NE and NW trending, defined by the feldspar long axes. Variations in biotite fabric intensity and symmetry in deifferent sections of the vertical profile were used to determine a plausible flow geometry in these sections.
   Numerical modelling involving a component of coaxial flattening, with various amounts of extension parallel and perpendicular to stretch in addition to simple shearing, agrees qualitatively with the observed data. The models demonstrate that, under combined coaxial and simple shear flow regimes, mutually orthogonal lienar fabrics may result from progressive rotation of the shortest crystals
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    7. 12. 2007
Import date
    8. 8. 2012