HR: 10:50h
AN: T21F-03    [PDF]
TI: Direct Measurements Of The Elastic Properties Of Iron To 115 GPa
AU: * Crowhurst, J C
EM: crowhurst1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AU: Zaug, J M
EM: zaug1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AU: Goncharov, A
EM: goncharov1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 E Avenue, Livermore, CA 94550 United States
AB: The velocity of an acoustic wave propagating at the interface between diamond and polycrystalline iron has been measured using impulsive stimulated light scattering (ISLS) to 115 GPa in a diamond anvil cell. Our data provide the first direct measurements of the elastic properties of hexagonal close-packed iron at pressures comparable to that at the boundary between the Earth's core and mantle. The corresponding compressional and shear velocities are found to be linearly dependent on density, and consequently suggest a reliable extrapolation to inner-core conditions. Velocities thus obtained are compared with those of the Preliminary Reference Earth, and implications for core composition and structure are discussed.
DE: 3909 Elasticity and anelasticity
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
SC: Tectonophysics [T]
MN: 2003 Fall Meeting