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Sound velocities and elastic constants of iron-bearing hydrous ringwoodite.pdf

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Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Physics of the Earth and Planetary Interiors 143–144 (2004) 47–56 Sound velocities and elastic constants of iron-bearing hydrous ringwoodite Steven D. Jacobsen a,? , Joseph R. Smyth b , Hartmut Spetzler b,c , Christopher M. Holl b , Daniel J. Frost a a Bayerisches Geoinstitut, Universit?t Bayreuth, Bayreuth D-95440, Germany b Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0399, USA c Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309-0216, USA Received 4 December 2002; received in revised form 8 May 2003; accepted 24 July 2003 Abstract The sound velocities and single-crystal elastic constants of Fo89 hydrous ringwoodite (-Mg1.7Fe0.22H0.16SiO4) containing ～10,000 ppm by weight (1 wt.%) 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 0.5–2.0 GHz. 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 1 wt.% H2O reduces the adiabatic bulk (K0S = 176 ± 7 GPa) and shear (G = 103 ± 5 GPa) 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 40 m/s for every 1000 ppm weight (0.1 wt.%) 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. ? 2004 Elsevier B.V. All rights reserved. Keywo