The post-spinel transformation in Mg2SiO4 and its relation to the 600-km seismic discontinuity

Article Abstract:

Research examining the causes of the 660-km seismic discontinuity in the mantle of the Earth is presented. Particular attention is given to experiments of the transformation of (Mg, Fe)2SiO4 from ringwoodite to (Mg,Fe)O-magnesiowustite and (Mg, Fe)SiO3-perovckite.

Cases, Seismological research, Functions, Discontinuous, Discontinuous functions

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Deeper understanding

Article Abstract:

The lower most part of the Earth's mantle is called D" region historically. The physical properties of the high-pressure crystal structure with seismic observation in the part of the mantle are analyzed.

United States, Science & research, Structure

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Elasticity of forsterite to 16 GPa and the composition of the upper mantle

Article Abstract:

The elastic moduli of single crystals of forsterite (alpha-Mg2SiO4) obtained at pressures between 3.1 and 16.2 GPa show that the elastic moduli are directly related to pressure. With the assumption of a homeogenous mantle composition, the Earth's mantle at 410 km depth has less than 40% olivine which is less than that determined by the peridotite-based upper-mantle models. The elastic moduli are calculated by the Brillouin scattering in a diamond anvil cell.

Observations, Composition, Olivine, Silicate minerals, Seismic waves, Minerals, Minerals (Geology), Acoustic surface waves, Surface acoustic waves

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