| Budget Amount *help |
¥44,590,000 (Direct Cost: ¥34,300,000、Indirect Cost: ¥10,290,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2018: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2017: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
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| Outline of Final Research Achievements |
Geophysical observation revealed that the viscosity increases by an order of magnitude at a depth of ~ 1000 km in the earth’s lower mantle. At a same depth of ~1000 km, the stagnation of the subducted slabs are observed in several subduction zones. To constrain the mechanism of the viscosity jump, the viscosity properties of the constituent minerals of the lower mantle were investigated by using an improved and newly installed high-pressure deformation apparatus for a mineral physics approach. As a result, it is likely that the contribution of ferropericrace, which is the secondary phase of lower mantle assembly, for the viscosity change is low, and the viscosity of bridgmanite itself is the key factor.
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