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- W2117667667 abstract "We have conducted new equation of state measurements on liquid Fe2SiO4in a collaborative, multi-technique study. The liquid density (ρ), the bulk modulus (K), and its pressure derivative (K′) were measured from 1 atm to 161 GPa using 1-atm double-bob Archimedean, multi-anvil sink/float, and shock wave techniques. Shock compression results on initially molten Fe2SiO4 (1573 K) fitted with previous work and the ultrasonically measured bulk sound speed (Co) in shock velocity (US)-particle velocity (up) space yields the Hugoniot: US = 1.58(0.03) up + 2.438(0.005) km/s. Sink/float results are in agreement with shock wave and ultrasonic data, consistent with an isothermal KT = 19.4 GPa and K′ = 5.33 at 1500°C. Shock melting of initially solid Fe2SiO4 (300 K) confirms that the Grüneisen parameter (γ) of this liquid increases upon compression where γ = γo(ρo/ρ)q yields a qvalue of –1.45. Constraints on the liquid fayalite EOS permit the calculation of isentropes for silicate liquids of general composition in the multicomponent system CaO-MgO-Al2O3-SiO2-FeO at elevated temperatures and pressures. In our model a whole mantle magma ocean would first crystallize in the mid-lower mantle or at the base of the mantle were it composed of either peridotite or simplified “chondrite” liquid, respectively. In regards to the partial melt hypothesis to explain the occurrence and characteristics of ultra-low velocity zones, neither of these candidate liquids would be dense enough to remain at the core mantle boundary on geologic timescales, but our model defines a compositional range of liquids that would be gravitationally stable." @default.
- W2117667667 created "2016-06-24" @default.
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- W2117667667 date "2012-10-01" @default.
- W2117667667 modified "2023-10-18" @default.
- W2117667667 title "Multi-technique equation of state for Fe<sub>2</sub>SiO<sub>4</sub>melt and the density of Fe-bearing silicate melts from 0 to 161 GPa" @default.
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- W2117667667 doi "https://doi.org/10.1029/2012jb009403" @default.
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