• journal_title：American Mineralogist
• Contributor：Zhu Mao ; Steven D. Jacobsen ; Daniel J. Frost ; Catherine A. McCammon ; Erik H. Hauri ; Thomas S. Duffy
• Publisher：Mineralogical Society of America
• Date：2011-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2011.3807
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：96
• issue：10
• firstpage：1606
• section：Articles

The single-crystal elastic properties of Fe-bearing wadsleyite with 1.93 wt% H₂O (Mg_1.634Fe_0.202H_0.305SiO₄) have been determined by Brillouin scattering. At ambient conditions, the aggregate bulk and shear moduli (K_S0, G₀) of this wadsleyite are 156.2(5) and 98.0(3) GPa, respectively. Compared to the corresponding anhydrous wadsleyite, 1.93 wt% H₂O lowers K_S0 and G₀ 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 H₂O increases the pressure derivative of the shear modulus, G₀′ from 1.5(1) to 1.9(1). This contrasts with the G₀′ 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.