ELASTIC SYMMETRY AND ANISOTROPIC PARAMETE RS OF SPECIMENS OF ARCHEAN GNEISSES AND KOLA SUPERDEEP-BOREHOLE AMPHIBOLITES

Using an invariant-polarization ultrasound method, we have studied the velocities of elastic waves in the gneisses and amphibolites of the s econd rock mass of the Archean complex of the Kola superdeep borehole (7622-9456 m) and calculated the determinate components of acoustic te nsor and elastic-constant tensor and their symmetry. The symmetry of t he studied structures is shown to be rhombic and triclinic. The stereo projections of mineral's crystallographic orientation and normals to m icrofractures are built by the data on the inversion of the azimuthal dependence of elastic constants.