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| Home > Publications database > Sound velocities of skiagite–iron–majorite solid solution to 56 GPa probed by nuclear inelastic scattering |
| Home > Publications database > Sound velocities of skiagite–iron–majorite solid solution to 56 GPa probed by nuclear inelastic scattering |
| Journal Article | PUBDB-2019-00164 |
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2018
Springer
Heidelberg
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Please use a persistent id in citations: doi:10.1007/s00269-017-0928-8
Abstract: High-pressure experimental data on sound velocities of garnets are used for interpretation of seismological data related to the Earth’s upper mantle and the mantle transition zone. We have carried out a Nuclear Inelastic Scattering study of iron-silicate garnet with skiagite (77 mol%)–iron–majorite composition in a diamond anvil cell up to 56 GPa at room temperature. The determined sound velocities are considerably lower than sound velocities of a number of silicate garnet end-members, such as grossular, pyrope, Mg–majorite, andradite, and almandine. The obtained sound velocities have the following pressure dependencies: $V_p$ [km/s] = 7.43(9) + 0.039(4) × P [GPa] and $V_s$ [km/s] = 3.56(12) + 0.012(6) × P [GPa]. We estimated sound velocities of pure skiagite and khoharite, and conclude that the presence of the iron–majorite component in skiagite strongly decreases $V_s$ . We analysed the influence of Fe$^{3+}$ on sound velocities of garnet solid solution relevant to the mantle transition zone and consider that it may reduce sound velocities up to 1% relative to compositions with only Fe$^{2+}$ in the cubic site.
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