2013 Fiscal Year Final Research Report
First principles investigation of the elasticity of serpentine minerals
| Project/Area Number |
24740357
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Ehime University |
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Principal Investigator |
TSUCHIYA Jun 愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (00527608)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 高圧鉱物物性 |
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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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