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.

结果总结如下： 1.锁定放大器对于检测被背景噪声掩盖的小信号是必不可少的，它对于重建受噪声干扰的信号模式也很有用。 “由锁定放大器同时测量信号的各个分量，以便我们可以分别对两个分量进行背景校正。2.我们确认手工制作的传感器可在高达 50 MHz 的频率下使用。这项创新与上述改进对于高频超声光谱的未来发展具有重要意义。 3．对矩形样品的夹紧力引起的共振频移进行了验证，并在矩形共振法和球共振法中再次证实了所提出的频移机制。这些知识可用于未来研究中共振峰的识别。4．β、γ尖晶石和钙钛矿的测量已经完成，目前正在考虑结果的含义。

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。

Yoshino, T.: "Core formation triggered by grain boundary percolation"Nature. (in press). (2003)

Yoshino, T.：“晶界渗透引发的核心形成”自然。

S.Ono: "In situ observation of ilmenite-perovskite phase transition in MgSiO3 using synchrotron radiation"Geophys.Res.Lett.. 28. 835-838 (2001)

S.Ono：“使用同步辐射对 MgSiO3 中钛铁矿-钙钛矿相变进行原位观察”Geophys.Res.Lett.. 28. 835-838 (2001)

H.Furuichi: "Amorphous copper formation and related phenomena at ultrahigh pressure"J.Non-Crystal.Solid. 279. 215-218 (2001)

H.Furuichi：“超高压下非晶铜的形成和相关现象”J.Non-Crystal.Solid。

Yoneda, A.: "Intrinsic eigenvibration frequency in the resonant ultrasound spectroscopy"Earth Planets Space. 54. 763-777 (2002)

米田，A.：“共振超声波光谱中的固有本征振动频率”地球行星空间。