Refinement of metamorphic facies-H2O content diagram for subducting oceanic crust by use of greenstones in accretionary complexes
| Project/Area Number |
16K17823
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Shimane University |
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Principal Investigator |
Endo Shunsuke 島根大学, 総合理工学研究科, 特任講師 (60738326)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 低温変成作用 / 付加体 / 秩父帯 / 緑色岩 / 玄武岩 / アルカリ輝石 / ローソン石 / 秩父帯北帯 / 御荷鉾帯 / 沈み込み帯 / 地質学 / 岩石・鉱物・鉱床学 |
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| Outline of Final Research Achievements |
Structural and metamorphic architectures of the Mikabu-Northern Chichibu belt have been revealed as an example of deep accretionary wedge. Metabasalts (greenstones) in each unit of the belt have been examined to understand mineral reactions in shallow subduction zones as well as low-temperature thermodynamic mixing properties of key metamorphic minerals. Structural evolution of the belts can be explained by thickening of accretionary wedge by underplating and subsequent tectonic thinning and exhumation of deep seated rocks in the wedge. Alkali pyroxene is an important metamorphic mineral in low-grade metabasalt and its low-temperature mixing behavior in the diopside-aegirine-jadeite system is preliminary established by the natural data. Common occurrence of lawsonite veins formed via dehydration of pre-existed zeolite veins is discovered from the unmetamorphosed N. Chichibu accretionary complex, and this can be important source of fluid in seismogenic plate boundaries.
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Report
(3 results)
Research Products
(20 results)
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[Presentation] Evidence for localized high fluid pressure along the paleo subduction boundary exposed in the Sanbagawa belt, SW Japan2017
Author(s)
Wallis, S., Endo, S., Nagaya, T., Mori, H., Asahara, Y. & Kawahara, H.
Organizer
JpGU-AGU Joint Meeting, Makuhari
Related Report
Int'l Joint Research
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[Presentation] Water subduction processes constrained by halogens and noble gases in the Sanbagawa metamorphic rocks2017
Author(s)
Sumino, H., Burgess, R., Kouketsu, Y., Mizukami, T., Endo, S., Yoshida, K., Hirajima, T., Wallis, S. & Ballentine, C.J.
Organizer
Goldschmidt Conference, Paris
Related Report
Int'l Joint Research
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[Presentation] Metamorphic history of garnet amphibolite and pelitic schist from the Neldy Formation, Makbal district, Kyrgyz Northern Tian-Shan, Kyrgyzstan2017
Author(s)
Kasymbekov, A., Takasu, A., Kabir, M.F., Endo, S., Bakirov, A., Hirajima, T., Yoshida, K., Orozbaev, R. & Sakiev, K.
Organizer
日本鉱物科学会年会
Related Report
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[Presentation] Mineralogy of the mantle wedge at depths of deep slow slip: implications for fluid flow along the subduction boundary2016
Author(s)
Wallis, S.R., Endo, S., Nagaya, T., Kawahara, H., Mori, H. & Asahara, Y.
Organizer
American Geophysical Union Fall Meeting
Place of Presentation
San Francisco（アメリカ）
Year and Date
2016-12-12
Related Report
Int'l Joint Research
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[Presentation] Brucite as an important phase in the mantle wedge: evidence from the Sanbagawa belt, SW Japan2016
Author(s)
Wallis, S., Endo, S., Kawahara, H., Nagaya, T., Mori, H. & Asahara, Y.
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
幕張メッセ国際会議場（千葉市）
Year and Date
2016-05-22
Related Report
