Temperature derivatives of P and S wave velocities for mantle high pressure minerals

地幔高压矿物纵波和横波速度的温度导数

• 批准号: 12440121
• 负责人: YONEDA Akira
• 金额: $ 9.79万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440121/
• 关键词: ultrasound spectroscopy; perovskite; lower mantle; 670 km discontinuity; γ-スピネル; イルメナイト; 荷重補正; マントル; 高圧相鉱物; 地震波速度; 弾性波速度; ベータスピネル; パイロープ; 温度微係数

The results summarized below.1. Lock-in -Amplifier was introduced for ultrasound spectroscopy. It is indispensable to detect small signals masked by back ground noise. It also useful to reconstruct signal pattern disturbed by noise. The "cos" component and "sin" components of the signal simultaneously measured by the Lock-in-Amplifier so that we can conduct background correction separately for the two components.2. We confirmed that handmade -transducers are useful up to 50 MHz. This innovation, combined with the above improvement, is important for future development of high frequency ultrasound spectroscopy.3. Resonance frequency shift by clamp force was also examined fro rectangle specimen. The proposed mechanism for the frequency shift was confirmed again in rectangle resonance method as well as sphere resonance method. The knowledge can be applied for identification of resonant peaks in the future study.4. Measurements of β, γ spinels and perovskite have finished. The implications of the results are now considering.

研究结果总结如下：1.介绍了一种用于超声光谱分析的锁定放大器。检测被背景噪声掩盖的小信号是必不可少的。这对于重建受噪声干扰的信号模式也很有用。锁定放大器同时测量信号中的cos分量和sin分量，以便我们可以分别对这两个分量进行背景校正。我们确认手工制作的换能器在50兆赫以下是有用的。这一创新与上述改进相结合，对高频超声频谱分析仪的未来发展具有重要意义。对矩形试件也进行了夹紧力引起的共振频率漂移试验。在矩形谐振法和球谐振法中再次证实了所提出的频移机理。该知识可在今后的研究中用于识别共振峰。对β，γ尖晶石和钙钛矿的测量已经完成。这一结果的影响现在正在考虑中。

项目成果

T.Sumita: "A new thermal-analysis technique for detecting silicate melting under high pressure : Application to pyrope melting up to 9 GPa"High Temp.-High Press. (in press). (2002)

T.Sumita：“一种用于检测高压下硅酸盐熔化的新热分析技术：应用于高达 9 GPa 的镁铝榴石熔化”高温-高压。

Sumita, T.: "A new thermal-analysis technique for detecting silicate melting"High Temp.High Pressure. 34. 473-481 (2002)

Sumita, T.：“一种用于检测硅酸盐熔化的新热分析技术”高温高压。

Katsura, T.: "Post-spinel transition in Mg_2SiO determined by in situ X-ray diffractometry"Phys. Earth Planet. Int.. in press. (2003)

Katsura, T.：“通过原位 X 射线衍射测定 Mg_2SiO 中的后尖晶石转变”Phys。

Sumita, T.: "A new thermal-analysis technique for detecting silicate melting"High Temp.High Prressure. 34. 473-481 (2002)

Sumita, T.：“一种用于检测硅酸盐熔化的新热分析技术”高温高压。

N.Tomioka: "Microstructures and structural phase transition in (Mg, Fe)SiO3 majorite"Eur.J.Mineral.. 14. 7-14 (2002)

N.Tomioka：“(Mg, Fe)SiO3 多数石的微观结构和结构相变”Eur.J.Mineral.. 14. 7-14 (2002)