Regional fabric of the deep lithosphere in central Europe from seismic anisotropy |
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| Authors: | Vladislav Babu?ka Jaroslava Plomerová |
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| Institution: | (1) UNESCO, Division of Earth Sciences, 1, rue Miollis, F-75732 Paris, France;(2) Geophysical Institute, Czech Academy of Sciences, Bo ní II/1401, 141 31 Praha 4, Czech Republic |
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| Abstract: | Summary The large scale anisotropic structures with plunging symmetry axes in the subcrustal lithosphere of central Europe were derived from independent observations of teleseismic P-residual spheres and polarizations of the split SKS waves. The dipping structures are interpreted as remnants of palaeo-subduction systems which retain olivine orientations from ancient oceanic lithosphere. Values of kP and kS estimated from observed teleseismic P and SKS data are within the range of anisotropies found for the upper mantle rocks. The Variscides of central Europe may thus be characterized by two palaeo-subduction systems, with symmetry axes divergent relative to the suture between the Moldanubicum and Saxothuringicum. |
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| Keywords: | teleseismicP-residuals shear wave splitting continental upper mantle accreted terranes |
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