| Project/Area Number |
26610141
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Osaka University |
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Principal Investigator |
Terasaki Hidenori 大阪大学, 理学(系)研究科(研究院), 准教授 (50374898)
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| Co-Investigator(Renkei-kenkyūsha) |
SAKAIYA Tatsuhiro 大阪大学, 大学院理学研究科, 助教 (60452421)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 惑星核形成 / 重力不安定 / 鉄合金 / レーザー衝撃実験 / 核ーマントル分離 / 中心核 / 初期地球 / 核形成 / 衝撃圧縮 / 液体 / レーザー |
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| Outline of Final Research Achievements |
In order to clarify the core/mantle differentiation process controlled by gravitational instability, we have carried out in situ observation of gravitational instability of Fe-alloy under high pressure and temperature. By adding gravity to the sample using high power laser (GEKKO-XII), a surface perturbation of the sample was measured based on X-ray absorption imaging. It is found that an amplitude of the perturbation increased with time and that growth rate of the perturbation changed depending on the sample composition and existence of silicate layer on the sample. In this study, we successfully measured the perturbation growth of Fe-alloy samples caused by gravitational instability. The obtained results give us important information regarding terrestrial core formation mechanism and its time scale.
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