Journal
AMERICAN MINERALOGIST
Volume 104, Issue 10, Pages 1526-1529Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am-2019-7084
Keywords
DHMS; phase E; Brillouin spectroscopy; elasticity
Categories
Funding
- project GeoMaX under the Emmy-Noether Program of the German Science Foundation DFG [MA4534/3-1]
- International Research Training Group Deep Earth Volatile Cycles [GRK 2156/1]
- Bavarian Academy of Sciences
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The elastic properties of Mg2.12(2)Fe0.21(2)Ni0.01Si1.15(1)O6H2.67(8) phase E single crystals with Fe3+/Sigma Fe = 0.25(3) have been determined by Brillouin spectroscopy at ambient conditions. We find that that the elasticity of iron-bearing phase E is described by the six independent stiffness tensor components (all in units of GPa): C-11 = 192.2(6), C-12 = 56.4(8), C-13 = 43.5(8), C-14 = -4.3(3), C-33 = 192.1(7), C-44 = 46.4(3). The Voigt-Reuss-Hill averages of bulk and shear moduli are 95.9(4) and 59.6(2) GPa, respectively. The aggregate velocities of iron-bearing phase E are v(P) = 7.60(2) and v(S) = 4.43(1) km/s, markedly lower than those of major mantle minerals at ambient conditions. Modeling based on our results suggests that the presence of iron-bearing phase E may reduce the sound wave velocities in upper mantle and transition zone rocks, making it a possible target for future seismological investigations aiming to map hydration in subducting slabs.
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