Yamazaki D, Kato T, Ohtani E, Toriumi M
D. Yamazaki and M. Toriumi, Geological Institute, Faculty of Science, University of Tokyo, Bunkyo, Tokyo 113, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba, Ibaragi 305, Japan. E. Ohtani, Institute of Mineralogy, Petrology and Economic Geology, Tohoku University, Sendai 980-77, Japan.
Science. 1996 Dec 20;274(5295):2052-4. doi: 10.1126/science.274.5295.2052.
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.
已在25吉帕斯卡和1573至2173开尔文的条件下测定了聚集体中硅酸镁钙钛矿和方镁石的晶粒生长速率。将平均晶粒尺寸（G）拟合到速率方程中，钙钛矿和方镁石的晶粒生长速率分别为G10.6 = 1×10^(-57.4) t exp(-320.8/RT)和G10.8 = 1×10^(-62.3) t exp(-247.0/RT)，其中t为时间，R为气体常数，T为绝对温度。这些生长速率有助于深入了解与地球下地幔相关的矿物中晶粒生长的机制，最终将有助于确定下地幔的流变学性质。
