2018 Fiscal Year Annual Research Report
The influence of Al on the stability region of DHMS and water transports into the Earth's interior
| Project/Area Number |
18J12511
|
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
徐 超文 愛媛大学, 理工学研究科, 特別研究員(DC2)
|
|---|
| Project Period (FY) |
2018-04-25 – 2020-03-31
|
| Keywords | high pressure / phase relation / sound velocity / substitution mechanism / high temperature |
|---|
| Outline of Annual Research Achievements |
(1)I have successfully got the phase relations of Al-bearing DHMSs and clarified their physical and chemical properties, respectively. These results allowed us to obtain the phase diagram to constrain the stability region of Al-bearing DHMS.
(2)I have synthesized the Al-bearing PhD by using 2000-ton large volume press in Geodynamics Research Center, Ehime University.
(3) Most of our results have been reported on some international meetings, and will be submitted to international journals soon. The first year of research plan has been completed.
|
| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
(1) Obtained the effect of Al on the stability regions of dense hydrous magnesium silicate phases (DHMSs) by using 1000 and 2000 ton multi-anvil apparatuses at Ehime University.I also clarified the water content and Al substitution mechanism in DHMSs.The information is important to estimate the amount of water transporting into the deep Earth.
(2)I have synthesized the Al-bearing PhD by using 2000-ton large volume press in Geodynamics Research Center, Ehime University.I measured longitudinal (VP) and shear (VS) velocities, as well as density of Al-bearing PhD up to 22 GPa and 1300 K by in situ synchrotron X-ray techniques combined with ultrasonic measurements of a polycrystalline sample in the multi-anvil apparatus at the BL04B1 beamline of SPring-8, Japan.
|
| Strategy for Future Research Activity |
(1)Determine the equation of state of Al-bearing PhE, SUB and PhD. We will synthesize single crystals using 3000ton multianvil a t Ehime University. Obtain P-V-T equation of state by X-ray diffraction experiments. (2)Determine elastic properties and sound v elocity at SPring-8. Using the obtained elasticity, modeling seismic signature in transition zone and uppermost lower mantle con dition, which help explain the observed velocity anomalies in these regions. (3)Estimate the water content and distribution in t he deep earth.
|
