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Rheology of the Upper Mantle: A Synthesis
A synthesis of laboratory studies and geophysical and geological observations shows that transitions between diffusion and dislocation creep likely occur in the Earth's upper mantle. Expand
Importance of anelasticity in the interpretation of seismic tomography
Temperature dependence of seismic wave velocities comes both from anharmonicity and anelasticity. The contribution from anelasticity is shown to be important in the Earth's mantle particularly forExpand
Water-Induced Fabric Transitions in Olivine
It is shown that when a large amount of water is added to olivine, the relation between flow geometry and seismic anisotropy undergoes marked changes. Expand
Geodynamic Significance of Seismic Anisotropy of the Upper Mantle: New Insights from Laboratory Studies
Seismic anisotropy is caused mainly by the lattice-preferred orientation of anisotropic minerals. Major breakthroughs have occurred in the study of lattice-preferred orientation in olivine during theExpand
Rheology of synthetic olivine aggregates: Influence of grain size and water
The influence of grain size and water content on the high-temperature plasticity of olivine aggregates was studied, using a gas-medium high-pressure deformation apparatus. The specimens used wereExpand
Effect of water and stress on the lattice-preferred orientation of olivine
The influence of water and stress on the lattice-preferred orientation (LPO) of olivine aggregates was investigated through large strain, shear deformation experiments at high pressures andExpand
Origin of lateral variation of seismic wave velocities and density in the deep mantle
Strong constraints can be placed on the origin of heterogeneity of seismic wave velocities and density if the observed ratios of various parameters are compared with mineral physics predictions. TheyExpand
The effect of water on the electrical conductivity of olivine
The results show that the electrical conductivity of olivine aggregates is strongly dependent on water content but depends only modestly on temperature, and the water content dependence of conductivity is best explained by a model in which electrical conduction is due to the motion of free protons. Expand
Water content in the transition zone from electrical conductivity of wadsleyite and ringwoodite
The effects of water and temperature on the electrical conductivity of the minerals wadsleyite and ringwoodite are determined to infer the water content of the transition zone and significantly exceed the estimated critical water content in the upper mantle, suggesting that partial melting may indeed occur at ∼410 km depth, at least in this region. Expand
Lattice preferred orientation of olivine aggregates deformed in simple shear
REGIONS of the Earth's upper mantle show significant seismic ani-sotropy due to the preferred crystallographic orientation ('lattice preferred orientation') adopted by its constituent minerals inExpand