Reseach on petrological features of sub-arc mantle by arc-derived peridotites: an ordinary or extraordinaly
| Project/Area Number |
16K17834
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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 |
Petrology/Mineralogy/Economic geology
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| Research Institution | Kumamoto University |
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Principal Investigator |
ISHIMARU Satoko 熊本大学, 大学院先端科学研究部(理), 准教授 (60464046)
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| Project Period (FY) |
2016-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 島弧マントル / 記載岩石学 / 地球化学 / マントル交代作用 / 変形作用 / 交代作用 / 岩石・鉱物・鉱床学 / マントル物質 |
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| Outline of Final Research Achievements |
Based on our previous research, we detected some (fine-grained) peridotite xenoliths from Avacha volcano record various metasomatic events, and interpreted that the features were obtained by unknown type melt/fluid which derived down going slab. We speculate the characters are not atypical but typical in some mantle wedge beneath the volcanic front. To check the hypothesis, we made petrological and geochemical descriptions of sub-arc mantle derived peridotites and characterized their metasomatic process(es).
We obtained incompatible trace-element (light rare earth and large ion lithophile elements) rich features in some deformed (fine-grained) peridotites (e.g., Finero peridotite massif and Oman ophiolite) and which contain hydrous minerals (amphiboles and phlogopite) and orthopyroxene which implies that the perodotites are metasomatized by hydrous fluid(s) and/or melt(s). We are still not sure the feature is typical or atypical in a mantle wedge, and need much more detailed research.
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| Academic Significance and Societal Importance of the Research Achievements |
カンラン岩捕獲岩や固体貫入カンラン岩体類を用いて，島弧マントルカンラン岩の基本的な特徴とそこで記録された交代作用を明らかにした．観察された特徴の一般性／特殊性についてはまだ明確な答えは得られていないが，条件が揃えばマントル中に遷移金属や白金族元素が濃集すると考えられ，そのメカニズムの解明は全地球的な元素の移動を検討する上で重要である．
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Report
(7 results)
Research Products
(29 results)
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[Journal Article] Petrologic nature of the active subarc crust-mantle boundary: Mixed magmatic-metasomatic processes recorded in xenoliths from Sabtang island, Luzon arc.2019
Author(s)
Varela, C.T.V., Payot, B.D., Arai, S., Takeuchi, M., Ishimaru, S. and Tamura, A.
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Journal Title
Journal of Volcanology and Geothermal Research
Volume: 374
Pages: 80-99
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Decoding of mantle processes in the mersin ophiolite, Turkey, of end-member arc type: Location of the Boninite Magma Generation.2018
Author(s)
Ishimaru, S., Saikawa, Y., Miura, M., Parlak, O. and Arai, S.
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Journal Title
Minerals
Volume: 8
Issue: 10
Pages: 464-464
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge2017
Author(s)
Kobayashi, M., Sumino, H., Nagao, K., Burgess, R., Ishimaru, S., Arai, S., Yoshikawa, M., Kawamoto, T., Kumagai, Y., Kobayashi, T., Burgess, R., Ballentine, C.
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Journal Title
Earth and Planetary Science Letters
Volume: 457
Pages: 106-116
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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