| Project/Area Number |
25800298
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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/Economic geology
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
OZAWA Haruka 独立行政法人海洋研究開発機構, 海洋地球生命史研究分野, 技術研究員 (10598832)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 高圧高温実験 / ダイアモンドアンビルセル / 地球中心核 / 軽元素 / レーザー加熱式ダイアモンドアンビルセル |
|---|
| Outline of Final Research Achievements |
Melting phase relations in the Fe-FeSi system at high pressures were studied in order to put a constraint on the amount of silicon in the Earth’s core. The results demonstrate that the Si amount in the eutectic liquid is less than 2.6 wt% at 131 GPa and that the Si content in eutectic liquid decreases rapidly with increasing pressure. If silicon is the only light element in the core, the outer core should include ~12 wt.% Si. However, such outer core liquid crystallizes the CsCl-type phase that is more enriched in silicon than coexisting liquid, which contradicts with the seismic observations. These suggest that silicon cannot be the sole light element in the core.
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