Effect of hydration on the single-crystal elasticity of Fe-bearing wadsleyite to 12 GPa

Zhu Mao, Steven D. Jacobsen, Daniel J. Frost, Catherine A. McCammon, Erik H. Hauri, Thomas S. Duffy

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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 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 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 (vP, vS) of hydrous Fe-bearing wadsleyite are about 200(±24) m/s slower than anhydrous Fe-bearing wadsleyite at transition zone pressures.

Original languageEnglish (US)
Pages (from-to)1606-1612
Number of pages7
JournalAmerican Mineralogist
Issue number10
StatePublished - Oct 1 2011

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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