| Project/Area Number |
26287138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Ehime University |
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Principal Investigator |
Ohfuji Hiroaki 愛媛大学, 地球深部ダイナミクス研究センター, 教授 (80403864)
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| Co-Investigator(Kenkyū-buntansha) |
井上 徹 愛媛大学, 地球深部ダイナミクス研究センター, 教授 (00291500)
鍵 裕之 東京大学, 理学(系)研究科(研究院), 教授 (70233666)
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| Research Collaborator |
SUMIYA Hitoshi
KURIO Ayako
KOJIMA Yohei
TAKEDA Yuhei
ASANO Natsuko
YAMASHITA Tomoharu
NAKAYA Motosuke
ISOBE Futoshi
Konstantin D. Litasov
Valentn P. Afanasiev
Nikolai P. Pokhilenko
Alexander P. Yelisseyev
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2014: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Keywords | 多結晶ダイヤモンド / バラス / カーボナード / 包有物 / 微細組織 / マントル / C-H-O流体 / 高圧 |
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| Outline of Final Research Achievements |
We studied the microtexture and inclusions of polycrystalline diamonds (ballas and carbonado) to understand their origin and formation mechanism in the deep mantle. We found that most of them were formed in the subduction zone where crustal (oceanic) materials are supplied by slab subduction and C-H-O fluid (highly supersaturated with carbon) is dominated. The crystal growth and resulting microtexture seem to depend largely on the hydrodynamics (still or advective) of the growth media. Furthermore, we found, for the first time, a natural counterpart of nano-polycrystalline diamond, which is synthesized by high pressure and high temperature experiment and known to have superior hardness and mechanical properties, from a large impact crater in Russia and revealed the formation mechanism.
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