| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
Serpenine minerals play important role for the transportation of water into Earth's deep interiors. In this study, the structure and elasticity of lizardite and antigorite (modulation m = 16 and 17) have been determined by first principles calculation up to about 12 GPa. We found that the polarization direction is drastically changed by tilting the foliation plane of antigorite and the trench normal polarization anisotropy increases with pressure. As the result, trench normal polarization anisotropy about 0.2 s observed in the back-arc region can also be explained by the preferably oriented serpentinized fault about 10-20 km thick. The present study also suggests that serpentine transports water more than 100 km depth into the deep earth's interior.
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