Investigation of rock samples by neutron diffraction and ultrasonic sounding

The interpretation of large-scale geophysical anisotropies largely depends upon the knowledge of rock anisotropies of any kind (compositions, foliatio ns, grain shape, physical properties). Almost all physical rock properties (e.g. elastic, thermal, magnetic properties) are related to the textures of the rock constituents since they are anisotropic for the single crystal. A lthough anisotropy determinations are numerous, systematic investigations a re scarce. Therefore, several rock samples with different microfabrics were selected for texture analysis and to determine its P-wave distributions at various confining pressures. (C) 2000 Elsevier Science B.V. All rights res erved.