Record details

    Elastic anisotropy and pore space geometry of schlieren granite: direct 3-D measurements at high confining pressure combined with microfabric analysis
    Diraison, M.
    Géraud, Y.
    Lexa, O.
    Staněk, Martin
    Špaček, P.
    Ulrich, S.
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
    Roč. 194, č. 1
    s. 383-394
    Rozsah: 12 s. : P
Subject category
    fractures and faults
    magnetic fabrics and anisotropy
    seismic anisotropy
Abstract (in english)
   Pore space geometry of granitic rocks and its evolution with depth are key factors in large-scale seismics or in projects of enhanced geothermal systems or of deep hazardous waste repositories. In this study, we studied macroscopically anisotropic schlieren-bearing granite by experimental P-wave velocity measurements on spherical sample in 132 directions at seven different confining pressures in the range 0.1-400MPa. In order to discriminate the phenomena affecting the rock elastic properties we analysed the orientation of microcracks and of grain boundaries and we measured the anisotropy of magnetic susceptibility of the rock. Three sets of microcracks were defined, with two of them linked to the massif exfoliation process and one to cooling contraction of the massif.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    23. 10. 2014