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Grain-growth kinetics in wadsleyite: Effects of chemical environment |
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| Authors: | Yu Nishihara Toru Shinmei Shun-ichiro Karato |
| Institution: | a Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA b Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan c Research Center for the Evolving Earth and Planets, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan d Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan |
| Abstract: | Grain-growth kinetics in wadsleyite was investigated using a multianvil high-pressure apparatus. Fine-grained wadsleyite aggregates were synthesized by isostatic hot-pressing and were subsequently annealed under high pressure and temperature in a controlled chemical environment. Wadsleyite samples show normal grain-growth characterized by a log-normal grain-size distribution following the relation,  where n is a constant, L the grain-size at time t, L0 the grain-size at time t = 0 and k is a rate constant that depends on temperature T and chemical environments (fO2: oxygen fugacity in Pa, COH: water content in H/106Si) as: |
| Keywords: | Wadsleyite Grain-growth kinetics Water Subducting slab Mantle transition zone |
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