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

¹ Department of Geology, University of Illinois, Urbana, Illinois 61801, U.S.A.
² Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, U.S.A.

Correspondence: ^* E-mail: carmensv{at}uiuc.edu

The single-crystal elastic properties of phase A have been investigated by Brillouin spectroscopy at ambient conditions. The Voigt-Reuss-Hill verage for the adiabatic bulk and shear moduli are K_S = 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 (P6₃) structure is highly anisotropic with the c-axis, which is perpendicular to the distorted close-packed layers, approximately 21% stiffer than the a-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_P and shear V_S 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.

Key Words: Single-crystal elasticity • phase A • Brillouin spectroscopy • water in subduction zones

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