Directional dependence of P- and S-wave propagation and polarization in foliated rocks from the Kola superdeep well: Evidence from laboratory measurements and calculations based on TOF neutron diffraction

Ivankina, T. I., Kern, H. M. and Nikitin, A. N. (2005) Directional dependence of P- and S-wave propagation and polarization in foliated rocks from the Kola superdeep well: Evidence from laboratory measurements and calculations based on TOF neutron diffraction Tectonophysics, 407 (1-2). pp. 25-42. DOI 10.1016/j.tecto.2005.05.029.

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Abstract

We have measured P- and S-wave velocities on two amphibolite and two gneiss samples from the Kola superdeep borehole as a function of pressure (up to 600 MPa) and temperature (up to 600 degrees C). The velocity measurements include compressional (Vp) and shear wave velocities (Vs1, Vs2) propagating in three orthogonal directions which were in general not parallel to inherent rock symmetry axes or planes. The measurements are accompanied by 3D-velocities calculations based on lattice preferred orientation (LPO) obtained by TOF (Time Of Flight) neutron diffraction analysis which allows the investigation of bulk volumes up to several cubic centimetres due to the high penetration depth of neutrons. The LPO-based numerical velocity calculations give important information on the different contribution of the various rock-forming minerals to bulk elastic anisotropy and on the relations of seismic anisotropy, shear wave splitting, and shear wave polarization to the structural reference frame (foliation and lineation). Comparison with measured velocities obtained for the three propagation directions that were not in accordance with the structural frame of the rocks (foliation and lineation) demonstrate that for shear waves propagating through anisotropic rocks the vibration directions are as important as the propagation directions. The study demonstrates that proper measurement of shear wave splitting by means of two orthogonal polarized sending and receiving shear wave transducers is only possible when their propagation and polarization directions are parallel and normal to foliation and lineation, respectively. (c) 2005 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: velocity measurements TOF neutron diffraction lattice preferred orientation 3D-velocity calculation seismic anisotropy shear wave polarization texture analysis anisotropy velocities pressure crustal
Research affiliation: Kiel University
DOI etc.: 10.1016/j.tecto.2005.05.029
ISSN: 0040-1951
Date Deposited: 18 Jan 2012 05:18
Last Modified: 08 Oct 2012 10:26
URI: http://eprints.uni-kiel.de/id/eprint/16058

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