第71回ジオダイナミクスセミナー
　 　Geodynamics　Seminar

　　　　　「Wadsleyite の粒成長速度論」
　　　　　　　"Grain-growth kinetics in Wadsleyite"

　　　　講師：新名　亨（GRC学術創成研究員）　　　　　


　　　　　主催　：　愛媛大学地球深部ダイナミクス研究センター
　　　 　 日時　：　２００３年６月１３日（金）
　　　　　場所　：　愛媛大学理学部講義棟　２０１教室

要　旨
　The grain growth kinetics in wadsleyite was investigated using a multianvil high-pressure apparatus. Fine-grained wadsleyite aggregates were synthesized by isostatic hot-pressing and subsequently annealed under high pressure and temperatures with different chemical environment. Wadsleyite samples show normal grain growth characterized by a log-normal grain-size distribution following a relation, L n(t)-Ln(0) = k (T,P,C) t where n is a constant, L(t) is the grain-size at time t, and k (T,P,C) is a rate constant that depends on temperature (T), pressure (P) and chemical environment (C). The grain growth kinetics in wadsleyite is found to be more sluggish than that in olivine compared at similar thermodynamic conditions. However, the grain growth kinetics is sensitive to chemical environment: both water and oxygen fugacities significantly enhance the grain growth kinetics.


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　　　 　　　　　　　　　　　　　　　　E-mail　　yamazaki@sci.ehime-u.ac.jp