Redox state of mantle wedge inferred from the mantle section of the Oman ophiolite
Project/Area Number |
26610173
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Petrology/Mineralogy/Economic geology
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Research Institution | Niigata University |
Principal Investigator |
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Co-Investigator(Renkei-kenkyūsha) |
SATISH-KUMAR M 新潟大学, 自然科学系, 教授 (50313929)
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Research Collaborator |
AKASAKA Masahide
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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 |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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Keywords | オマーンオフィオライト / マントルセクション / マントルウェッジ / 酸化還元 / フラックス溶融 / 沈み込み帯 / かんらん岩 / 酸素フガシティー / ウェッジマントル / スピネル / オフィオライト / 上部マントル / スラブ / オマーン / 酸素フガシティ |
Outline of Final Research Achievements |
We studied the spatial distribution of oxygen fugacity in the Fizh mantle section of the northern Oman ophiolite as an analog for the redox state of mantle wedge. The delta log fO2 relative to FMQ buffer of harzburgites and dunites were calculated following the method of Ballhaus et al. (1991). The values range from FMQ-3.3 to +1.8 and tend to decrease from the crust-mantle boundary (Moho) to the basal part of the mantle section. Dunites are more oxidized than harzburgites. The Fe3+/∑Fe ratio of spinel were evaluated by Mossbauer spectroscopy. The difference is negligible compared to the whole range. The V/Sc and Zn/Fe ratios of whole rock peridotites show a strong negative and positive correlations with delta log fO2 (FMQ), respectively, indicating the observed variation and tendency of delta log fO2 (FMQ) are consistent with residues formed by flux melting of mantle section with a reduced melt/fluid derived from subducted sediment.
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Report
(4 results)
Research Products
(19 results)
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[Journal Article] Melt extraction and metasomatism recorded in basal peridotites above the metamorphic sole of the northern Fizh massif, Oman ophiolite2015
Author(s)
Yoshikawa, M., Python, M., Tamura, A., Arai, S., Takazawa, E., Shibata, T., Ueda, A., Sato, A.
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Journal Title
Tectonophysics
Volume: in press
Pages: 53-64
DOI
Related Report
Peer Reviewed
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[Presentation] Redox state of mantle wedge above subducting slab inferred from the mantle section of Oman ophiolite2016
Author(s)
Tani, M., Takazawa, E., Satish-Kumar, M., Akasaka, M., Kanke, N., Murakami, R., Suetake, A., Tamura, Y.
Organizer
Goldschmidt 2016
Place of Presentation
神奈川県横浜市西区 パシフィコ横浜
Year and Date
2016-06-29
Related Report
Int'l Joint Research
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[Presentation] Redox state of mantle wedge above subducting slab inferred from the mantle section of Oman ophiolite2016
Author(s)
Tani, M., Takazawa, E., Satish-Kumar, M., Akasaka, M., Kanke, N., Murakami, R., Suetake, A., Tamura, Y.
Organizer
The 26th Goldschmidt Conference
Place of Presentation
パシフィコ横浜
Year and Date
2016-06-29
Related Report
Int'l Joint Research
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[Presentation] Geochemical relationship of Haybi volcanics and amphibolites in the metamorphic sole of Oman ophiolite2016
Author(s)
Sakashita, M., Mori, N., Takazawa, E., Nohara, R., Takahashi, T., Tamura, Y.
Organizer
Goldschmidt 2016
Place of Presentation
神奈川県横浜市西区 パシフィコ横浜
Year and Date
2016-06-28
Related Report
Int'l Joint Research
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[Presentation] The redox state in the Fizh mantle section, the northern Oman ophiolite as an analog of mantle wedge in subduction zone2016
Author(s)
Tani, M., Takazawa, E., Satish-Kumar, M., Akasaka, M., Kanke, N., Murakami, R., Suetake, A., Tamura, Y.
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
千葉県千葉市美浜区 幕張メッセ国際会議場
Year and Date
2016-05-23
Related Report
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[Presentation] Geochemical evaluation of Haybi volcanic rocks as a protolith of amphibolites in the metamorphic sole of Oman ophiolite2016
Author(s)
Sakashita, M., Mori, N., Takazawa, E., Nohara, R., Takahashi, T., Tamura, Y.
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
千葉県千葉市美浜区 幕張メッセ国際会議場
Year and Date
2016-05-23
Related Report
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[Presentation] The redox state in the Fizh mantle section, the northern Oman ophiolite as an analog of mantle wedge in subduction zone2016
Author(s)
Tani, M., Takazawa, E., Satish-Kumar, M., Akasaka, M., Tamura, Y.
Organizer
日本地球惑星科学連合2016年大会
Place of Presentation
幕張メッセ国際会議場
Year and Date
2016-05-23
Related Report
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[Presentation] Residue and melt relationship between mantle peridotites and volcanic rocks in the Oman ophiolite2015
Author(s)
Takazawa, E., Nomoto, Y., Suetake, A., Kusano, Y., Umino, S., Tamura, Y.
Organizer
The Fourth International Congress on Natural Sciences
Place of Presentation
National Changhua University of Education
Year and Date
2015-09-10
Related Report
Int'l Joint Research
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[Presentation] Reexamination of genetic relationship between mantle peridotite and volcanic rocks in the Oman ophiolite.2015
Author(s)
Takazawa, E., Kanke, N., Fujii, S., Nomoto, U., Kusano, Y., Umino, S., Tamura, Y.
Organizer
日本地球惑星科学連合2015年大会
Place of Presentation
幕張メッセ国際会議場
Year and Date
2015-05-27
Related Report
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[Presentation] Update on the spatial distribution of highly refractory peridotites in the northern Oman mantle section as proxy for fluid infiltration and flux melting2014
Author(s)
Takazawa, E., Kanke, N., Nomoto, Y., Fujii, S., Suetake, A., and Murakami, R.
Organizer
6th Orogenic Lherzolite Conference
Place of Presentation
Marrakech, Morocco
Year and Date
2014-05-04 – 2014-05-15
Related Report