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- W2079577584 abstract "[1] High seismic velocity gradients in the transition zone have been attributed to large pressure derivatives of the elastic moduli of transition zone minerals, such as majorite-garnet. Here we present Brillouin scattering measurements of the elasticity of polycrystalline Mg-majorite (Mj100, Mg4Si4O12) and a Mj50Py50 majorite - pyrope solid solution to pressures similar to those at the top of the transition zone (15.1(1) GPa and 12.8(1) GPa, respectively). The pressure derivatives of the adiabatic bulk (KS) and shear (μ) moduli of both Mj50Py50 and Mj100 are 4.2(3) and 1.4(2), respectively, and are equal to those of pyrope within the experimental uncertainties. We conclude that neither the adiabatic compression of majorite-garnet nor any other likely transition zone phase is able to produce the high velocity gradients observed seismically. High velocity gradients are consistent with gradual transformations between minerals with very different elastic properties. The transformation of ∼25% or more of clinopyroxene into majorite above 520 km, and the formation of Ca silicate perovskite below 520 km could produce the observed seismic gradients." @default.
- W2079577584 created "2016-06-24" @default.
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- W2079577584 date "2002-01-01" @default.
- W2079577584 modified "2023-10-14" @default.
- W2079577584 title "Elasticity of Majorite and a Majorite-Pyrope solid solution to high pressure: Implications for the Transition Zone" @default.
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- W2079577584 doi "https://doi.org/10.1029/2001gl013937" @default.
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