Phase transformations in MSiO4 compounds at high pressures and their geophysical implications

Details Phase transformations in MSiO4 compounds at high pressures and their geophysical implications Phase transformations in MSiO4 compounds at high pressures and their geophysical implications

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..110l&link_type=abstract

Earth and Planetary Science Letters, Volume 57, Issue 1, p. 110-116.

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The phase behaviour of MSiO4 compounds (M--Hf, Zr, U and Th0 has been investigated at high pressures and temperatures in a diamond-anvil press coupled with laser heating. All of these compounds have been found to undergo two or perhaps three phase transformations at pressures below 300 kbar. The high-pressure phase transformations of these compounds differ from one another, with the exception of HfSiO4 and ZrSiO4, which undergo identical phase transformations. The ultimate phase assemblages of these compounds are of dense component dioxides (although this is yet to be confirmed in ThSiO4). It is suggested that the heat-producing elements U and Th would exist as dioxide solid solutions rather than silicates in the deep interior of the earth. Moreover, the densities of these dioxides are more than twice as great as mantle silicates and even slightly greater than pure iron under similar P, T conditions. Gravitational separation due to mandle convection may transport these dioxides to the deep interior of the earth to form deep heat sources. It is also suggested, however, that these deep heat sources are located in the inner-outer core boundary instead of in the lower mantle.

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