Geodynamics and state of the earth's interior

Details Geodynamics and state of the earth's interior Geodynamics and state of the earth's interior

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgeo....1...79s&link_type=abstract

Journal of Geodynamics (ISSN 0264-3707), vol. 1, Feb. 1984, p. 79-100.

Physics

2

Earth Core, Earth Mantle, Earth Planetary Structure, Geodynamics, Planetary Evolution, Tectonics, Dynamo Theory, Geochemistry, Geotemperature, Phase Transformations, Planetology, Seismic Waves

Scientific paper

Some results of recent investigations of the connections between planetary geodynamics and the properties of the material inside the earth are reviewed. The concept of 'state' is considered both in the local and in the global context. Several interpretations are offered on the evolution of phase boundaries in the earth's mantle, and a new formula is offered for describing seismic discontinuities in terms of the density dependence of elastic velocities. The permanent flux of Fe-S causes droplets to form in the outer coil and to grow to a size where buoyancy is strong enough to overcome drag forces. The corresponding rate of release of gravitational potential energy is found to be enough to drive a geodynamo with an average toroidal field. It is concluded that global planetary evolution most likely started from an originally homogeneous earth.

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