2023 Fiscal Year Annual Research Report
超音波速度測定と波形インバージョンの協同による深部マントル部分溶融仮説の検証
| Project/Area Number |
23H01274
|
|---|
| Allocation Type | Single-year Grants |
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
GREAUX Steeve 愛媛大学, 地球深部ダイナミクス研究センター, 助教 (90543166)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
柿澤 翔 公益財団法人高輝度光科学研究センター, 回折・散乱推進室, テニュアトラック研究員 (10846819)
河合 研志 東京大学, 大学院理学系研究科(理学部), 准教授 (20432007)
|
|---|
| Project Period (FY) |
2023-04-01 – 2028-03-31
|
| Keywords | mantle composition / high pressure / ultrasonic measurement / seismological model / waveform inversion / triplication |
|---|
| Outline of Annual Research Achievements |
P- and S-wave elastic velocities are unique tools we have to explore the composition and structures of the inaccessible deep Earth, by comparing high pressure mineral physics data with seismological observations. Here we aim at resolving seismic structures across the Earth's mantle transition zone, on the basis of in situ P- and S-wave elastic wave velocity and synchrotron X-ray measurements , "waveform inversion method" and numerical simulations. In this FY, we measured the elastic wave velocities of olivine + MORB samples with varying MORB content up to 10 wt.%, at the beamline BL04B1 in SPring-8. The high-pressure experiments were conducted at 10 GPa and T up to 2000 K, which should represent the mantle region above the 410 km seismic discontinuity.
|
| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The experimental set up and softwares at the beamline BL04B1 in SPring-8 were improved, allowing for faster and automatic X-ray and sound velocity measurements upon compression or increasing temperature.
|
| Strategy for Future Research Activity |
In the next FY, we plan to measure the elastic wave velocities of Wadsleyite + MORB samples and Ringwoodite + MORB with varying MORB content. The high-pressure experiments will be conducted at pressures of 12 to 20 GPa and T up to 2000 K, which should represent mantle region in between depths of 410 km and 520 km in the mantle transition region. In parallel, we will work on syntheses of pyrolite + MORB samples for additional measurements in more natural rock composition. Our second objective is to improve the capabilities of high-temperature measurements by implementing a cooling system to the first-stage anvils, in the multianvil apparatus.
|
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
[Presentation] Sound velocities in the Lunar Mantle2023
Author(s)
Wood M.C., Greaux S., Kono Y., Kakizawa S., Ishikawa Y., Inoue; S., Kuwahara H. and Irifune
Organizer
28th AIRAPT and 60th EHPRG International Conference on High Pressure Science and Technology, Edinburgh (UK)
Int'l Joint Research
-
-
-
-
-
-
