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DOI	10.1029/2020JB019415
	Grain-Boundary Diffusion Creep of Olivine: 1. Experiments at 1 atm
	Yabe K.; Sueyoshi K.; Hiraga T.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	We conducted one-atmosphere uniaxial compression experiments on fine-grained (~1 μm) Fe-bearing olivine (Mg1.8Fe0.2SiO4) aggregates that were variably doped with CaO ± Al2O3. We identified power-law interface-controlled creep at low stresses and grain-boundary diffusion creep at high stresses, which operate as mutually coupled, that is, sequential processes. We established constitutive equations for interface-controlled creep and diffusion creep of undoped olivine and used the combined rate equation as a reference to examine the effect of doping on creep rates. Ca and Al were found to enhance rates of both interface-controlled creep and diffusion creep above certain temperatures, and this effect becomes significant with increasing temperature. We attribute the rate enhancements to grain-boundary disordering promoted by grain-boundary segregation of the dopants at near-solidus conditions. The enhancements are well described in relation to the sample solidus temperature and an additional activation energy relative to that of the reference creep state. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187656
作者单位	Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Yabe K.,Sueyoshi K.,Hiraga T.. Grain-Boundary Diffusion Creep of Olivine: 1. Experiments at 1 atm[J],2020,125(8).
APA	Yabe K.,Sueyoshi K.,&Hiraga T..(2020).Grain-Boundary Diffusion Creep of Olivine: 1. Experiments at 1 atm.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Yabe K.,et al."Grain-Boundary Diffusion Creep of Olivine: 1. Experiments at 1 atm".Journal of Geophysical Research: Solid Earth 125.8(2020).