Stability of hydrous phase H and water behavior in the lower mantle
| Project/Area Number |
15H05469
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Ehime University |
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Principal Investigator |
Nishi Masayuki 愛媛大学, 地球深部ダイナミクス研究センター, 講師 (10584120)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥22,100,000 (Direct Cost: ¥17,000,000、Indirect Cost: ¥5,100,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
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| Keywords | 含水鉱物 / 地球深部水 / マルチアンビル装置 / 高圧実験 / ダイヤモンドアンビルセル / 下部マントル / 地球・惑星内部構造 / マントル / 核 / 水素 / 高圧 / 中心核 / 含水相 / 高温高圧実験 / 焼結ダイヤモンドアンビル / 沈み込むプレート / 相転移 / 高温高圧 |
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| Outline of Final Research Achievements |
Several recent studies have reported hydrous minerals to be stable at pressure and temperature conditions representative of Earth’s deep interior, implying that surface water may be transported to the deep mantle. However,the dehydration decomposition of hydrous minerals generally occurs at pressures before reaching those corresponding to the deep lower mantle. In this study, stabilities of hydrous phases, FeOOH and AlOOH, have been studied at the pressure and temperature conditions of the deep lower mantle, based on first-principles calculations and in situ X-ray diffraction experiments. The formation of a new FeOOH and AlOOH phases, which are stable at the conditions of the base of the mantle, have been observed.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究結果は、含水鉱物が地球マントルの深部環境で分解するという従来の学説を覆す発見であり、いまだに解明されていない地球深部における水の循環を明らかにするための新たな知見となると期待される。本研究結果によると、水は地表からマントルと地球中心核の境界付近の 2,900km程度の深さまで運ばれる可能性がり、この領域で水がどのようなふるまいをするかが盛んに研究され始めている。
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Report
(5 results)
Research Products
(22 results)
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[Journal Article] Thermal equation of state of MgSiO4H2 phase H determined by in situ X-ray diffraction and a multianvil apparatus2018
Author(s)
Nishi, M., Tsuchiya, J., Arimoto, T., Kakizawa, S., Kunimoto, T., Tange, Y., Higo, Y. and Irifune, T.
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Journal Title
Physics and Chemistry of Minerals
Volume: 45(10)
Issue: 10
Pages: 995-1001
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Phase Relations in the System MgSiO3‐Al2O3 up to 2300 K at Lower Mantle Pressures2017
Author(s)
Zhaodong Liu, Masayuki Nishi, Takayuki Ishii, Hongzhan Fei, Nobuyoshi Miyajima, Tiziana Boffa Ballaran, Hiroaki Ohfuji, Takeshi Sakai, Lin Wang, Svyatoslav Shcheka, Takeshi Arimoto, Yoshinori Tange, Yuji Higo, Tetsuo Irifune, Tomoo Katsura
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Journal Title
Journal of Geophysical Research: Solid Earth
Volume: 122
Issue: 10
Pages: 7775-7788
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Thermal equations of state of MgSiO4H2 phase H2018
Author(s)
Nishi, M., Tsuchiya, J., Arimoto, T., Kakizawa, S., Kunimoto, T., Tange, Y., Higo Y., Irifune, T.
Organizer
Interaction and Coevolution of the Core and Mantle Toward Integrated Deep Earth Science, International Symposium FY2017
Related Report
Int'l Joint Research
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