Comparative study of oceanic plate and ophiolite based on accurate analyses of crustal and mantle material
| Project/Area Number |
17340162
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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 |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Niigata University |
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Principal Investigator |
MIYASHITA Sumio Niigata University, Institute of Science and Technology, Professor (60200169)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAZAWA Eiichi Niigata Univ., Institute of Science and Technology, Associate Professor (80222082)
MAEDA Jin-ichiro Hokkaido Univ., Faculty of Science, Assistant Professor (50165643)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥15,700,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥900,000)
Fiscal Year 2007: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2006: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2005: ¥8,400,000 (Direct Cost: ¥8,400,000)
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| Keywords | ophiolite / ocean ridge / oceanic crust / mantle / gabbro / segmentation / 微量成分組成 / ガブロ / 海洋リソスフェア / 海嶺火成活動 / マグマ |
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| Research Abstract |
The results obtained from this research project are summarized as follows.
Systematic mineral and bulk rock analyses for mantle harzburgites sampled from extensive area of the northern Oman ophiolite indicate that a highly depleted zone is present within the mantle section. The depleted zone is defined by the appearance of Cr-spinels with high Cr# (Cr/(Cr+Al), and traced along the shear zone trending NW-SE described by French group. Remelting of mantle sections caused by invasion of fluids expelled from the underling basement during oceanic thrusting movement would bring a such depleted zone.
We have examined a regional variation of the mantle-crust transition zone. Lithologic column obtained from7 routes, located at different locations in a segment architecture, indicate a systematic variation of the mantle-crust transition zone depending on the segment structure, as follows. The thickness of the transition zone thickens toward the segment center, and become to thin at the segment margi
… More
n. However, abnormally thick transition zone was found from the northern tribute branch of Wadi Fizh, locating at the most margin of the segment. Systematic variations in structural features in the transition zone are also obvious, that is, intensive lineation and foliation are well observed at the segment center, while they are only poorly developed at the segment margin. These results suggest that mantle upwelling and magmatic flowage were more vigorous at the segment center. Also lithologic column for extrusive successions are studied at different localities in terms of segment structure. Systematic variations in respect to mode of occurrence of the extrusives were found, as follows: Massive flows are predominant at the segment center with numerous numbers of unit. Whereas, pillow lavas are predominant at the segment margin and are characterized by much thicker unit than the segment center. Thus, both extrusives in the uppermost level, and deeper section of the crust, were controlled by segmentation structure. Less
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Report
(4 results)
Research Products
(52 results)
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[Journal Article] Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan: Asthenospheric mantle up welling during back-arc basin opening2008
Author(s)
Shuto, K., Ishimoto, H., Hirahara, Y., Sato, M., Matsui, K., Fujibayashi, N., Takazawa, E., Yabuki, K., Sekine, M., Kato, M., and Rezanov, A. I.
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Journal Title
Description
「研究成果報告書概要(和文)」より
Related Report
Peer Reviewed
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[Journal Article] 「研究成果報告書概要(和文)」より2007
Author(s)
Morishita, T., Maeda, J., Miyashita, S., Kumagai, H., Matsumoto, T. and Dick, H. J. B.
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Journal Title
European Journal of Mineralogy 19
Pages: 871-882
Related Report
Peer Reviewed
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[Journal Article] Petrology of local concentration of chromian spinel in dunite from the slow-spreading Southwest Indian Ridge2007
Author(s)
Morishita, T., Maeda, J., Miyashita, S., Kumagai, H., T, Dick, H. J. B
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Journal Title
European Journal of Mineralogy 19
Pages: 871-882
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] Petrology of local concentration of chromian spinel in dunite from the slow-spreading Southwest Indian Ridge.2007
Author(s)
Morishita, T., Maeda, J., Miyashita, S., Kumagai, H., Matsumoto, T. and Dick, H. J. B.
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Journal Title
European Journal of Mineralogy 19
Pages: 871-882
Related Report
Peer Reviewed
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[Journal Article] Proc. IODP, 309/3122006
Author(s)
Teagle, D. A. H., Alt, J. C., Umino, S., Miyashita, S., Banerjee, N. R., Wilson, D. S., and the Expedition 309/312 Scientists
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Journal Title
Integrated Ocean Drilling Program Management International, Inc. 309/312
Description
「研究成果報告書概要(和文)」より
Related Report
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[Journal Article] Corundum-bearing mafic granulites in the Horoman(Japan)and Ronda(Spain)Peridotite Massifs: Possible remnants of recycled crustal materials in the mantle2006
Author(s)
Morishita, T., Takazawa, E., Arai, S., Obata, M., Kodera, T. and Gervilla, F.
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Journal Title
Description
「研究成果報告書概要(和文)」より
Related Report
Peer Reviewed
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[Journal Article] Drilling to Gabbro in Intact Ocean Crust2006
Author(s)
D. S, Wilson, D.A.H, Teagle, J. C, Alt, N. R, Banerjee, S, Umino, S, Miyashita, et. al.
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Journal Title
Science 312
Pages: 1016-1020
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] and the Expedition 309/312 Scientists, Proc. IODP, 309/3122006
Author(s)
Teagle, D.A.H., Alt, J.C., Umino, S., Miyashita, S., Banerjee, N.R., Wilson, D.S
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Journal Title
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] Corundum-bearing mafic granulites in the Horoman(Japan) and Ronda(Spain) Peridotite Massifs: Possible remnants of recycled crustal materials in the mantle2006
Author(s)
Morishita, T., Takazawa, E., Arai, S., Obata, M., Kodera, T., Gervilla, F
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Journal Title
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] Corundum-bearing mafic granulites in the Horoman (Japan) and Ronda (Spain) Peridotite Massifs : Possible remnants of recycled crustal materials in the mantle2006
Author(s)
Morishita, T., Takazawa, E., Arai, S., Obata, M., Kodera, T., Gervilla, F.
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Journal Title
Related Report
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[Journal Article] Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan : Asthenospheric mantle upwelling during back-are basin opening.2006
Author(s)
Shuto, K., Ishimoto, H., Hirahara, Y., Sato, M., Matsui, K., Fujibayashi, N., Takazawa, E.
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Journal Title
Related Report
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[Journal Article] Geochemical secular variation of magma source during Early to Middle Mioxene time in the Niigata area, NE Japan : Asthenospheric mantle upwelling during back-arc basin opening2006
Author(s)
Shuto, K., Ishimoto, H., Hirahara, Y., Sato, M., Matsui, K., Fujibayashi, N., Takazawa, E., R., et al.
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Journal Title
Related Report
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[Journal Article] Superfast spreading rate crust 2 and 32005
Author(s)
Alt, J. C., Miyashita, S., Teagle, D. A. H., Umino, S., Miller, D. J., Banerjee, N., and the Expeditions 309 and 312 ProjectTeam
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Journal Title
Description
「研究成果報告書概要(和文)」より
Related Report
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[Journal Article] Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan: Asthenospheric mantle upwelling during back-arc basin opening
Author(s)
Shuto, K., Ishimoto, H., Hirahara, Y., Sato, M., Matsui, K., Fujibayashi, N., Takazawa, E., Yabuki, K., Sekine, M., Kato, M., Rezanov, A. I
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Journal Title
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Book] Proc. IODP, 309-3122006
Author(s)
Teagle, D.A.H., Alt, J.C., Umino, S., Miyashita, S., et al.
Publisher
Washington, DC (integrated Ocean Drilling Program Management International, Inc.).
Related Report
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