New phase for mantle research

Article Abstract:

Analysis of a predicted phase transformation of stishovite under high pressure, using Raman spectroscopy and a theoretical model, suggests that the structural transformation occurs at lower pressures than previously thought. Stishovite, a polymorph of silicon dioxide, undergoes phase transformation to the CaCl2 structure. The results suggest that free silica in the lower mantle will exist in the CaCl2 structure at low pressures, at depths greater than 1,200 km.

Research, Analysis, Phase transformations (Statistical physics), Phase transitions (Physics), Silicon compounds

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Mantle dynamics and the heat flow into the Earth's continents

Article Abstract:

The effect of the continents on mantle heat loss stabilizes reduced continental heat flow over a course of time. Reduced continental heat flow decreases for a while, subsequent to a thermotectonic event in an area but attains a steady value after some time. Numerical models can explain disturbances associated with mantle convection that cause lateral temperature changes in the mantle. A constant heat flux from the mantle can explain the reduced heat flow.

Observations, Convection (Meteorology), Atmospheric convection, Heat waves (Meteorology), Warm fronts

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Just add water

Article Abstract:

Reasons for Earth's upper mantle being depleted of many trace elements are discussed. At a certain depth, minerals might release water, creating a molten filter that traps trace elements in the mantle beneath.

Models, Mantle convection

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