Physics
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.160..107i&link_type=abstract
Earth and Planetary Science Letters, vol. 160, Issue 1-2, pp.107-113
Physics
53
Elastic Properties, Olivine Group, Lattice Parameters, Single-Crystals Method
Scientific paper
Single-crystal elastic properties of hydrous ringwoodite are reported for samples that were synthesized at 19 GPa and 1300°C. The Mg/Si ratio is determined to be ~1.95 by EPMA, which is slightly lower than that of ideal anhydrous ringwoodite. The H 2 O content determined by SIMS is ~2.2 wt%, resulting in the stoichiometry Mg 1.89 Si 0.97 O 4 H 0.33 . The lattice parameter Å) and elastic constants were determined from a single crystal with X-ray diffractometry and Brillouin scattering spectroscopy. The crystal structure is cubic Fd3m, with a unit cell volume which is 0.51% larger than that of the anhydrous ringwoodite. The adiabatic single-crystal elastic moduli of hydrous ringwoodite, in GPa, are: , , . The isotropic properties of hydrous ringwoodite are and which are about 16 and 10% smaller than those of anhydrous ringwoodite. Thus hydrous ringwoodite, if present, drastically reduces the seismic velocity in the mantle transition zone relative to anhydrous ringwoodite. In addition, our results show that the anisotropy is enhanced relative to anhydrous ringwoodite. Using the present results, we discuss the 520 km seismic discontinuity in a wet mantle transition zone.
Inoue Toru
Northrup Paul A.
Parise John B.
Weidner Donald J.
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