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Single-crystal elastic properties of dense hydrous magnesium silicate phase A

American Mineralogist, ISSN: 0003-004X, Vol: 91, Issue: 5-6, Page: 961-964
2006
  • 19
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  • 21
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Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    21

Article Description

The single-crystal elastic properties of phase A have been investigated by Brillouin spectroscopy at ambient conditions. The Voigt-Reuss-Hill average for the adiabatic bulk and shear moduli are K = 106(1) GPa and μ = 61(1) GPa respectively. The present acoustic measurements resolve discrepancies between the bulk moduli obtained in earlier compression studies. The axial compressibility of the hexagonal (P6) structure is highly anisotropic with the c-axis, which is perpendicular to the distorted close-packed layers, approximately 21% stiffer than the α-axis, in agreement with previous compression studies. The hydration of forsterite to phase A decreases the bulk and shear moduli by about 18 and 21%, respectively, while both compressional V and shear V wave velocities decrease by about 7%. These results suggest that water could be identified seismologically if phase A is present in abundance in cold subducted slabs.

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