第59回ジオダイナミクスセミナー
　　　Geodynamics　Seminar

　　「マントル鉱物の高圧下での弾性波速度測定」
　“Elastic wave velocities of mantle minerals
　　at high pressure”
　　　　　　　　　
　　　講師：肥後祐司（愛媛大博士後期課程2年）


　　　　　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１月３１日（金）午後17時〜
　　　　　場所　：　愛媛大学理学部講義棟　２０１教室
要　旨
　 At present, it is widely accepted that olivine is the most important mineral in the Earth's upper mantle. The elastic property changes associated with the phase transformations to its high-pressure polymorphs are very important parameters to constrain the composition of the mantle transition zone. In this study, we measured the elastic wave velocity of Ringwoodite Mg2SiO4, (Mg0.8Fe0.2)2SiO4 and Majorite MgSiO3, (Mg0.8, Fe0.2)SiO3. High-pressure ultrasonic measurement was carried out in a 1000-ton Uniaxial Split-Cylinder Apparatus (USCA-1000: SUNY) at pressures up to 12 GPa at room temperature using ZnTe as internal pressure marker. The sample was surrounded by lead to minimize the deviatoric stress. Also in this experiment, the travel times of the Al2O3 buffer rod were used for pressure calculation. The travel times of the buffer rod under the same cell geometry have been calibrated as a function of sample pressure by the thermal equation of state of NaCl using in-situ X-ray diffraction techniques.





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