| Project/Area Number |
23K25970
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| Project/Area Number (Other) |
23H01274 (2023)
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Multi-year Fund (2024)
Single-year Grants (2023) |
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| Section | 一般 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | Ehime University |
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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)
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| 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)
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| Project Period (FY) |
2023-04-01 – 2028-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2027: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2026: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2025: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2024: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Keywords | mantle composition / high pressure / ultrasonic measurement / seismological model / waveform inversion / triplication |
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| Outline of Research at the Start |
The current research project aims at resolving seismic structures in the Earth's mantle transition zone, on the basis of in situ P- and S-wave elastic wave velocity and synchrotron X-ray measurements on inhomogeneous rocks under high pressure, "waveform inversion method" and numerical simulations.
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| 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.
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| 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.
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| 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.
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