Measurement of Elastic Wave Velocity of Mg Perovskite Unter High Pressures and Materials of the Lower Mantle

高压下镁钙钛矿弹性波速测量及下地幔材料

• 批准号: 01540327
• 负责人: FUJISAWA Hideyuki
• 金额: $ 1.34万
• 依托单位: Earthquake Research Institute, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540327/
• 关键词: Magnesium Perovskite; Elastic Wave Velocity; 670km Discontinuity; High Pressure Experiment; Lower Mantle; Mantle Minerals; Mg・ペロボスカイト

All through the measurement under high pressures which correspond to the earth's lower mantle we have to use a very small sample, the length of which is a few millimeter, because an available volume in the high pressure apparatus under such conditions is very limitted.There exists no natural Mg perovskite, and we have to use a synthesized sample.First of all we have to develop a electronic system for the accurate measurement of elastic wave velocity with a very small mineral sample, because no such system has not yet existed in the world. We have modified our original system for the measurements of velocities of the upper mantle minerals.Mg perovskite samples was synthesized under pressures more than 20GPa by Prof. E. Ito of Institute for Study of the Earth's Interior, Okayama University. The length of sample is about 2mm, the diameter is about 1mm.With the modified system we first tried to observe a transmitted signal through this small diameter. The simple observation of this kind of signals has been very successful.However, in successive trials to measure pressure dependence of the velocity we have not been able to observe clear signals under high pressures.

在对应于地球下地幔的高压下的测量中，我们必须使用非常小的样品，其长度为几毫米，因为在这种条件下高压装置中的可用体积非常有限。我们必须使用合成样品。首先，我们必须开发一个电子系统，用于精确测量非常小的矿物样品的弹性波速度，因为世界上还没有这样的制度。我们对原有的上地幔矿物速度测量系统进行了改进。冈山大学地球内部研究所的伊藤说。样品长度约为2 mm，直径约为1 mm，利用改进后的系统首次尝试观察到了通过这一小直径的透射信号。这种信号的简单观测已经非常成功，然而，在连续的测量速度的压力依赖性的试验中，我们还没有能够在高压下观察到清晰的信号。

项目成果

藤沢 英幸: "オリビンはマントルに存在するか?、(マントル鉱物の弾性波速度の測定と400km不連続の成因の研究)" 岩鉱. 特別号No.4. 115-120 (1989)

Hideyuki Fujisawa：“地幔中是否存在橄榄石？（地幔矿物弹性波速度的测量和 400 km 不连续性的起源研究）” Iwamine 特刊第 4. 115-120 号（1989 年）。

T.Sasakura,H.Yoneda,K.Suito,H.Fujisawa: "Variation of the elastic constants of InSb near the covalentーmetalic transition," High Pressure Res.4. 318-320 (1990)

T.Sasakura、H.Yoneda、K.Suito、H.Fujisawa：“共价金属转变附近 InSb 弹性常数的变化”，高压研究 4 (1990)。

T. Sasakura, K. Suito, H. Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures up to 6.0 GPa" Proc. XIth AIRAPT International Conference on High Pressure, Kiev(1987), Kiev Naukova Dumka. VOL. 2. 60-72 (1989)

T. Sasakura、K. Suito、H. Fujisawa：“在高达 6.0 GPa 的静水压力下测量熔融石英中的超声波速度”Proc。

T.Sasakura,K.Suito,H.Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures upto 6.0 GPa" Proc.XIth AIRAPT International Conference on High Pressure,Kiev(1987),Kiev Naukova Dumka. 2. 60-72 (1989)

T.Sasakura、K.Suito、H.Fujisawa：“在高达 6.0 GPa 的静水压力下测量熔融石英中的超声波速度”Proc.XIth AIRAPT 国际高压会议，基辅（1987 年），基辅 Naukova Dumka。

T.Sasakura,K.Suito,H.Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures upto 6.0 GPa" Proc.Xlth AIRAPT lnternational Conference on High Pressure,Kiev(1987),Kiev Naukova Dumka. 2. 60-72 (1989)

T.Sasakura、K.Suito、H.Fujisawa：“在高达 6.0 GPa 的静水压力下测量熔融石英中的超声波速度”Proc.Xlth AIRAPT 国际高压会议，基辅（1987 年），基辅 Naukova Dumka。