Processes of deep terrestrial mantles and cores

Details Processes of deep terrestrial mantles and cores Processes of deep terrestrial mantles and cores

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept....3j&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 3-4 (SEE N92-10728 01-91)

Physics

Geophysics

1

Cores, Geochemistry, Perovskites, Planetary Cores, Planetary Mantles, Venus (Planet), Diamonds, Electrical Resistivity, High Pressure, Recycling, Surface Properties, Water

Scientific paper

Ultrahigh pressure experiments are currently focused on revealing processes occurring deep inside planets. This is in addition to the traditional emphasis on the constitution of planetary interiors, such as the identification of the high pressure perovskite phase of (Mg,Fe)SiO3 as the predominant mineral inside the Earth, and probably Venus. For example, experiments show that the mechanism of geochemical differentiation, separation of partial melts, differs fundamentally in the lower mantles of Earth and Venus than at near surface conditions. In addition to structural transformations, changes in chemical bonding caused by pressure can also be significant for planetary interiors. Measurements of AC and DC electrical conductivity can be obtained at ultrahigh pressures and temperatures, to greater than 80 GPa and 3000 K simultaneously, using the laser heated diamond cell. Anhydrous lower mantle assemblages (perovskite + or - oxide phases) exhibit an electrical conductivity that depends strongly on Fe content. Contrary to traditional assumptions, temperature affects the conductivity of lower mantle assemblages relatively little. The Earth's deep focus seismicity can be explained by the recycling of water into the mantle.

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