Phase transformations in the transition zone of the mantle and possible changes in the earth's radius

Details Phase transformations in the transition zone of the mantle and possible changes in the earth's radius Phase transformations in the transition zone of the mantle and possible changes in the earth's radius

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982geokh.....1729b&link_type=abstract

Geokhimiia, Dec. 1982, p. 1729-1743. In Russian.

Computer Science

Earth Mantle, Earth Planetary Structure, Geoids, Phase Transformations, Silicates, Aluminum Oxides, Density Distribution, Earth Core, Ilmenite, Iron Oxides, Magnesium Oxides, Metal Oxides, Perovskites, Planetary Composition, Planetary Evolution, Planetary Geology, Silicon Dioxide, Thermodynamic Properties

Scientific paper

A survey of the sequence of phase transitions in the MgO-FeO-SiO2 system under the conditions of the earth's mantle shows that experimentally observed structural state transformations correctly explain the principal discontinuities encountered in the increase in density with depth within the earth. The properties of the ilmenite, corundum, and perovskite modifications of MgSiO3 are evaluated for what is believed to be the first time. It is shown that all the transformations occurring in the upper mantle and in the transition zone proceed with a positive slope of dP/dT, whereas the transition into a mixture of the perovskite modification and periclase (MgO), which explains the boundary between the transition zone and the lower mantle, has a negative slope. An assessment is made of the changes that may have occurred in the density of individual layers deep within the earth in response to the increasing depth of phase transformations. It is believed that this effect may have been responsible for increases in the earth's radius by 3-5% over the last two billion years.

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