2006 Fiscal Year Final Research Report Summary
Physical properties of deep Earth minerals and the effect of water
| Project/Area Number |
15340150
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Ehime University |
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Principal Investigator |
INOUE Toru Ehime University, Geodynamics Research Center, Associate Professor, 地球深部ダイナミクス研究センター, 助教授 (00291500)
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| Co-Investigator(Kenkyū-buntansha) |
IRIFUNE Tetsuo Ehime University, Geodynamics Research Center, Professor, 地球深部ダイナミクス研究センター, 教授 (80193704)
ANDO Jun-ichi Hiroshima University, Department of Earth and Planetary Systems Science, Assistant Professor, 大学院・理学研究科, 助手 (50291480)
HIGO Yuji Ehime University, Geodynamics Research Center, Postdoctoral Fellow, 地球深部ダイナミクス研究センター, 研究機関研究員 (10423435)
OHFUJI Hiroaki Ehime University, Geodynamics Research Center, Assistant Professor, 地球深部ダイナミクス研究センター, 助手 (80403864)
YAMAZAKI Daisuke Okayama University, Institute for study of the Earth's interior, Associate Professor, 地球物質科学研究センター, 助教授 (90346693)
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| Project Period (FY) |
2003 – 2006
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| Keywords | mantle mineral / elastic wave velocity / ultrasonic measurement / water partitioning / hydrous magma / high pressure hydrous phase / high pressure apparatus / water in the mantle |
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| Research Abstract |
We have clarified the physical properties of deep Earth mantle minerals and the effect of water. Experiments were conducted by in situ X-ray measurements in addition to quench experiments.
From our previous studies, it has been clarified that high pressure polymorphs of olivine, wadsleyite and ringwoodite, can contain 2-3 wt% of H_2O in their crystal structures, but the partitioning of H_2O among these minerals has not been clarified yet. In the present study, we have clarified the partitioning of H_2O to synthesize these coexisting phases, and found that mantle transition zone should be a strong water reservoir in the Earth's interior.
In addition, the measurements of thermal expansion and elastic properties of hydrous wadsleyite and hydrous ringwoodite were conducted to clarify the H_2O content in the mantle. Combined these results with seismic observation, we estimated the H_2O content in the mantle. Further extensive studies have been conducted with seismologist.
We also tried to observe dehydration and physical properties of high pressure hydrous phase with capsulation using relatively light metal capsule by in situ X-ray observation. We succeeded to get X-ray spectra of superhydrous phase B using AgPd capsule, and further improved capsule, which were made by a single crystal diamond sleeve and metal caps, were designed for in situ X-ray experiment. The capsule is quite successful, and the effective acquisition of X-ray spectra under high pressure has been achieved by in situ X-ray experiment. This technique has been adopted to determine hydrous melt structure and time-resolved experiment of dehydration.
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[Journal Article] The phase boundary between wadsleyite and ringwoodite in Mg_2SiO_4 determined by in situ X-ray diffraction2006
Author(s)
Inoue, T., T.Irifune, Y.Higo, T.Sanehira, Y.Sueda, A.Yamada, T.Shinmei, D.Yamazaki, J.Ando, K.Funakoshi, W.Utsumi
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Journal Title
Phys. Chem. Minerals 33
Pages: 106-114
Description
「研究成果報告書概要(和文)」より
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[Journal Article] The phase boundary between wadsleyite and ringwoodite in Mg_2SiO_4 determined by in situ X-ray diffraction2006
Author(s)
Inoue, T., T.Irifune, Y.Higo, T.Sanehira, Y.Sueda, A.Yamada, T.Shinmei, D.Yamazaki, J.Ando, K.Funakoshi, W.Utsumi
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Journal Title
Phys.Chem.Minerals 33
Pages: 106-114
Description
「研究成果報告書概要(欧文)」より
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