Details

Autor(en) / Beteiligte

• Siegesmund, S
• Fritzsche, M
• Braun, G
• Meissner, Rolf
• Brown, Larry
• Franke, Wolfgang
• Seifert, Friedrich
• Dürbaum, Hans‐Jürgen
• Fuchs, Karl

Titel

Reflectivity Caused by Texture‐Induced Anisitropy in Mylonites

Ist Teil von

• Continental Lithosphere: Deep Seismic Reflections, 1991, p.291-298

Ort / Verlag

Washington, D. C: American Geophysical Union

Erscheinungsjahr

1991

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• The directional dependence of P‐ and S‐wave velocities from mid‐crustal mylonites in high‐pressure situations has been investigated. From crystallographic preferred orientations of mineral components and the respective elastic constants, the Voigt average was used to determine the complete 3‐D elasticity tensor. With increasing preferred orientation, due to progressive mylonitization, the anisotropy of V P increases from about 2% (protolith) to about 11% at the ultramylonitic stage. Shear wave splitting is at a minimum (<1%) in the nearly isotropic parent rock; whereas, in the ultramylonite, it is around 8%. Synthetic seismograms were calculated, using the reflectivity method, for models consisting of horizontal layers with anisotropy increasing with depth, in a first attempt to model the seismic response of an anisotropic medium with realistically derived elasticity tensors.