Podrobnosti záznamu

Název
    3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data
Autor
    Ivankina, T.
    Kern, H.
    Lokajíček, Tomáš
    Svitek, Tomáš
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Physics of the Earth and Planetary Interiors
Svazek/č.
    Roč. 231, June
Strany
    s. 1-15
Rok
    2014
Poznámky
    Projekt: GA13-13967S, GA ČR3cav_un_auth*0292766
    Projekt: GAP104/12/0915, GA ČR, CZ3cav_un_auth*0288140
    Projekt: LH13102, GA MŠk3cav_un_auth*0292547
    Rozsah: 15 s. : P
Předmětová kategorie
    3D-velocity calculation
    measured and calculated elastic properties
    neutron diffraction
    seismic anisotropy
    velocity measurements
Klíčové slovo
    3D
    Apparatus
    Biotite
    Calculated
    Comparison
    Data
    Distribution
    Gneiss
    Measured
    Measurements
    Medium
    Multi-anvil
    Oil
    P-
    Pressure
    S-waves
    Texture-based
    Velocity
Abstrakt (anglicky)
   Ultrasonic measurements of the 3D velocity distribution of P- and S-waves were performed on a spherical sample of a biotite gneiss from the Outokumpu scientific drill hole. Measurements were done at room temperature and pressures up to 400 and 70. MPa, respectively, in a pressure vessel with oil as a pressure medium. A modified transducer/sample assembly and the installation of a new mechanical system allowed simultaneous measurements of P- and S-wave velocities in 132 independent directions of the sphere on a net in steps of 15°. Proper signals for P- and S-waves could be recorded by coating the sample surface with a high-viscosity shear wave gel and by temporal point contacting of the transmitter and receiver transducers with the sample surface during the measurements.
   The 3D seismic measurements revealed a strong foliation-related directional dependence (anisotropy) of P- and S-wave velocities, which is confirmed by measurements in a multi-anvil apparatus on a cube-shaped specimen of the same rock. Both experimental approaches show a marked pressure sensitivity of P- and S-wave velocities and velocity anisotropies. With increasing pressure, P- and S-wave velocities increase non-linearly due to progressive closure of micro-cracks. The reverse is true for velocity anisotropy. 3D velocity calculations based on neutron diffraction measurements of crystallographic preferred orientation (CPO) of major minerals show that the intrinsic bulk anisotropy is basically caused by the CPO of biotite constituting about 23. vol.% of the rock. Including the shape of biotite grains and oriented low-aspect ratio microcracks into the modelling increases bulk anisotropy.
   An important finding from this study is that the measurements on the sample sphere and on the sample cube displayed distinct differences, particularly in shear wave velocities. It is assumed that the differences are due to the different geometries of the samples and the configuration of the transducer-sample assembly. On the spherical sample with a point source and point receiver the first break at the velocity arrival time is suggested to define group velocities in most cases, whereas the receivers in the multi-anvil apparatus recorded the flat part of the wavefront, that is, phase velocities.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014