Abstract
The single-crystal elastic properties of Fe-bearing wadsleyite with 1.93 wt% H 2 O (Mg 1.634 Fe 0.202 H 0.305 SiO 4 ) have been determined by Brillouin scattering. At ambient conditions, the aggregate bulk and shear moduli (K S0 , G 0 ) of this wadsleyite are 156.2(5) and 98.0(3) GPa, respectively. Compared to the corresponding anhydrous wadsleyite, 1.93 wt% H 2 O lowers K S0 and G 0 by 8.1% and 9.3%, respectively. High-pressure measurements up to 12 GPa show that the pressure derivative of the bulk modulus, K′ S0 = 4.8(1), is similar to that of the anhydrous Fe-wadsleyite with reported values of 4.6-4.74, but the addition of H 2 O increases the pressure derivative of the shear modulus, G 0 ′ from 1.5(1) to 1.9(1). This contrasts with the G 0 ′ of Fe-free wadsleyite, which is the same within uncertainty for the hydrous and anhydrous phases. As a result, both the compressional- and shear-wave velocities (v P , v S ) of hydrous Fe-bearing wadsleyite are about 200(±24) m/s slower than anhydrous Fe-bearing wadsleyite at transition zone pressures.
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