Grain growth rates of MgSiO3 perovskite and periclase under lower mantle conditions

Daisuke Yamazaki, Takumi Kato, Eiji Ohtani, Mitsuhiro Toriumi

Research output: Contribution to journalArticle

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Abstract

The grain growth rates of MgSiO3 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.

Original languageEnglish
Pages (from-to)2052-2054
Number of pages3
JournalScience
Volume274
Issue number5295
DOIs
Publication statusPublished - Dec 20 1996
Externally publishedYes

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periclase
perovskite
lower mantle
rheology
grain size
mineral
gas
temperature

ASJC Scopus subject areas

  • General

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Grain growth rates of MgSiO3 perovskite and periclase under lower mantle conditions. / Yamazaki, Daisuke; Kato, Takumi; Ohtani, Eiji; Toriumi, Mitsuhiro.

In: Science, Vol. 274, No. 5295, 20.12.1996, p. 2052-2054.

Research output: Contribution to journalArticle

Yamazaki, Daisuke ; Kato, Takumi ; Ohtani, Eiji ; Toriumi, Mitsuhiro. / Grain growth rates of MgSiO3 perovskite and periclase under lower mantle conditions. In: Science. 1996 ; Vol. 274, No. 5295. pp. 2052-2054.
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