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Article Dans Une Revue Physics and chemistry of the earth. Part A: Solid earth and geodesy Année : 2000

P-wave anisotropy in eclogites and relationship to the omphacite crystallographic fabric

Résumé

Measurements of P-wave velocity at room temperature and confining pressures up to 500 MPa were carried out on three eclogite mylonites collected from a shear zone in the Monviso area (Western Alps). P-wave velocities at a pressure of 400 MPa range from 7.7 km/s to 7.9 km/s, yielding to a maximum anisotropy of 6%. From the CPO of omphacite we estimated a maximum contribution of omphacite to the P-wave anisotropy of only 1.3%. These results suggest that primarily the compositional layering and secondary the fabric of minor constituent minerals significantly contribute to the seismic anisotropy. Because of the anisotropy, the seismic reflectivity of subduction zones may vary with the direction of observation.
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hal-03867204 , version 1 (14-03-2023)

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Alexandra Mauler, Luigi Burlini, Karsten Kunze, Pascal Philippot, Jean Pierre Burg. P-wave anisotropy in eclogites and relationship to the omphacite crystallographic fabric. Physics and chemistry of the earth. Part A: Solid earth and geodesy, 2000, 25 (2), pp.119-126. ⟨10.1016/S1464-1895(00)00020-X⟩. ⟨hal-03867204⟩

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