|Budget Amount *help
¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2011: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2010: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
To understand a role of rheological properties (such as viscosity contrast at 660 km depth) in material behaviors in the Earth's deep mantle, the rheology of mantle minerals were studied based on high-pressure and high-temperature deformation experiments with in situ observation. We demonstrated the importance of grain-size-sensitive creeps, as well as dislocation creep, in deformation of the upper mantle olivine, the significant water-weakening of wadsleyite in the mantle transition zone, and that separation of oceanic crust near 660 km depth is unlikely due to low viscosity contrast between ringwoodite and majorite.