GEOPHYSICAL RESEARCH, 2016, vol.17, no.3, pp. 70-87.  DOI: 10.21455/gr2016.3-6

UDC 534.2, 622.02

Abstract  References  Full text (in Russian)  Full text (in English)


I.Yu. Zel(1,2), T.I. Ivankina(1), T. Lokajicek(3), H. Kern(4), D.M. Levin(2)

(1) Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia

(2) Tula State University, Tula, Russia

(3) Institute of Geology Academy of Sciences Czech Republic, Prague, Czech Republic

(4) Institute of Earth Sciences, University of Kiel, Germany 

Abstract. The paper presents the results of experimental and theoretical investigations on highly anisotropic layered plagioclase-biotite gneiss and biotite gneiss of weak anisotropy. We used two different methods for measuring seismic anisotropy: measurements of P-wave ray velocities on a sphere and comprehensive measurements of P- and S-wave phase velocities on a cube under different confining pressures. The combination of P-wave velocity spatial distribution with S-wave velocities in three orthogonal directions was used to recover the elastic moduli of anisotropic rock samples. The crystallographic preferred orientations (CPOs) of major minerals were measured by time-of-flight neutron diffraction. On the basis of CPO the effective media modeling of elastic properties was performed using different inclusion methods and averaging procedures. In our work for the first time we implemented a nonlinear approximation of the P-wave velocity-pressure relation for estimation of mineral matrix properties and orientation distribution of microcracks. From the theoretical modeling we found that the bulk elastic anisotropy of the sample is controlled by the CPOs of micas grains and microcracks. The comparison of theoretical calculations of elastic properties with ultrasonic measurements showed large discrepancies in S-wave velocities. 

Keywords: biotite gneiss, elastic wave velocities, crystallographic texture, compositional layering, seismic anisotropy.



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