Seismic anisotropy of the Earth's inner core resulting from flow induced by Maxwell stresses

Article Abstract:

It is possible that flow induced by the stress due to the magnetic field, the Maxwell stress, close to the inner-core boundary of the Earth produces an axisymmetric fabric responsible for the identified seismic anisotropy. The Maxwell-stress-induced flow produces a large strain and therefore could cause substantial fabric (lattice preferred orientation) of inner-core materials. The flow also causes non-uniform energy release at the inner-outer core boundary because of the melting or solidification of iron.

Core (Geology)

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Water content in the transition zone from electrical conductivity of wadsleyite and ringwoodite

Article Abstract:

A study is carried out to determine the effects of water and temperature on the electrical conductivity of the minerals wadsleyite and ringwoodite to infer the water content of the transition zone. The findings of the study state that the electrical conductivity of these minerals depends strongly on water content but only weakly on temperature.

Electrical conductivity, Minerals, Minerals (Geology)

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Whole-mantle convection and the transition-zone water filter

Article Abstract:

Ocean-island and mid-ocean-ridge basalts are traditionally inferred to arise from separate, isolated reservoirs in the Earth's mantle because of their distinct chemical signatures, but such mantle reservoir models satisfy geochemical constraints and not geophysical observations. An alternative hypothesis for this problem is suggested.

Mantle (Geology), Mantle convection

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