Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3514303j&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 14, CiteID L14303
Physics
11
Mineral Physics: Elasticity And Anelasticity, Mineral Physics: Equations Of State, Geochemistry: Composition Of The Mantle, Geochemistry: Thermodynamics (0766, 3611, 8411), Mineralogy And Petrology: Mineral And Crystal Chemistry (1042)
Scientific paper
Water, dissolved as hydroxyl (OH)- into the solid silicate minerals of the upper mantle can reduce adiabatic wave speeds through associated defects. Here we report Brillouin spectroscopy measurements of the sound velocities and single-crystal elastic constants of hydrous forsterite (hy-Fo100) and hydrous olivine (hy-Fo97) containing 0.8-0.9 wt% H2O. The samples, synthesized at 12 GPa and 1250°C, represent nearly the maximum storage capacity of water in olivine at conditions of 350-400 km depth. The adiabatic bulk (K S0) and shear (G 0) moduli of hy-Fo100 are 125.7(+/-0.2) GPa and 79.8(+/-0.1) GPa, respectively. For hy-Fo97, we obtain K S0 = 124.4(+/-0.4) GPa and G 0 = 75.3(+/-0.3) GPa. Compared with anhydrous forsterite, the combined effects of 3 mol% Fe and 0.8 wt% H2O reduce bulk and shear moduli by 3.5(+/-0.3)% and 7.5(+/-0.4)% respectively, with greater reductions expected for more iron-rich Fo90 mantle compositions. Although lattice preferred orientation (LPO) studies have not been carried out under relevant conditions of water or pressure, analysis of idealized single-crystal anisotropy for various known LPO types predicts up to 3% higher S-wave splitting anisotropy in hydrous olivine crystals aligned according to A-type and E-type fabrics, but no change in S-wave splitting anisotropy for B-type and C-type fabrics.
Duffy Thomas S.
Frost Daniel J.
Holl Christopher M.
Jacobsen Steven D.
Jiang Fuming
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