Grain Growth Rates of MgSiO_3 Perovskite and Periclase Under Lower Mantle Conditions

Details Grain Growth Rates of MgSiO_3 Perovskite and Periclase Under Lower Mantle Conditions Grain Growth Rates of MgSiO_3 Perovskite and Periclase Under Lower Mantle Conditions

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...274.2052y&link_type=abstract

Science, Volume 274, Issue 5295, pp. 2052-2054

Physics

29

Scientific paper

The grain growth rates of MgSiO_3 perovskite and periclase in aggregates have been determined at 25 gigapascals and 1573 to 2173 kelvin. The average grain size (G) was fitted to the rate equation, and the grain growth rates of perovskite and periclase were G10.6 = 1 x 10-57.4 t exp(-320.8/RT) and G10.8 = 1 x 10-62.3 t exp(-247.0/RT), respectively, where t is the time, R is the gas constant, and T is the absolute temperature. These growth rates provide insight into the mechanism for grain growth in minerals relevant to the Earth's lower mantle that will ultimately help define the rheology of the lower mantle.

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