Trench parallel anisotropy and large delay times: Elasticity and anisotropy of antigorite at high pressures

Details Trench parallel anisotropy and large delay times: Elasticity and anisotropy of antigorite at high pressures Trench parallel anisotropy and large delay times: Elasticity and anisotropy of antigorite at high pressures

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809315m&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 9, CiteID L09315

Physics

4

Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Physical Properties Of Rocks: Acoustic Properties, Seismology: Subduction Zones (1207, 1219, 1240)

Scientific paper

Using theoretical methods, we calculate the full elastic constant tensor and equation of state of antigorite up to 10 GPa, a pressure range that encompasses its experimentally observed stability field. At ambient conditions, the elastic constant tensor reveals significantly large acoustic anisotropy (38% in VP; 35% in VS) compared to the dominant mantle phase olivine. The shear anisotropy is enhanced upon compression. Upon compression, the full elastic constant tensor reveals anomaly at ρ ˜ 2.69 gm cm-3. At ρ < 2.69 gm cm-3, we find that the pressure-volume results for antigorite are well represented by a third order Birch-Murnaghan formulation, with K0 = 52 GPa, K0′ = 8.5 and V0 = 3037 Å3 (ρ0 ˜ 2.48 gm cm-3). Our results on elasticity and anisotropy at conditions relevant to the mantle wedge indicates that a 10-20 km layer of antigorite might account for the observed shear polarization anisotropy with fast polarization parallel to the trench and associated large delay times of 1-2 sec observed in some subduction zone settings.

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