Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Details Sound velocities and elastic constants of iron-bearing hydrous ringwoodite Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143...47j&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 47-56.

Physics

36

Scientific paper

The sound velocities and single-crystal elastic constants of Fo89 hydrous ringwoodite (γ-Mg1.7Fe0.22H0.16SiO4) containing ~10,000ppm by weight (1wt.%) H2O have been determined from seven separate pure-mode travel-time measurements using gigahertz ultrasonic interferometry. The experiments feature a new Yttrium-Aluminum-Garnet (YAG) P-to-S conversion shear buffer rod (BR), capable of producing pure ultrasonic shear waves with known polarization in the region of 0.5-2.0GHz. To our knowledge they are the first such single-crystal ultrasonic measurements on a high-pressure phase recovered from the multi-anvil press. The cubic single-crystal elastic constants of hydrous Fo89 ringwoodite at ambient conditions are (in GPa): c11=298+/-13, c44=112+/-6, and c12=115+/-6. Hydration of Fo~90 ringwoodite to 1wt.% H2O reduces the adiabatic bulk (K0S=176+/-7GPa) and shear (G=103+/-5GPa) moduli by about 6 and 13%, roughly equivalent to raising the temperature at room pressure by 600 and 1000°C, respectively. Assuming a linear trend with hydration, we calculate that P- and S-wave velocities are reduced by about 40m/s for every 1000ppm weight (0.1wt.%) H2O added to Fo~90 ringwoodite. P- and S-wave velocities of the lower transition zone in PREM are consistent with a hydrated ringwoodite-rich composition.

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