2016 Fiscal Year Final Research Report
Production of primary magma and development of incipient arc on a hot subduction zone
| Project/Area Number |
26800260
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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 | National Institute of Advanced Industrial Science and Technology (2015-2016)
Kanazawa University (2014) |
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Principal Investigator |
Kusano Yuki 国立研究開発法人産業技術総合研究所, 活断層・火山研究部門, 研究員 (00635972)
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| Co-Investigator(Renkei-kenkyūsha) |
UMINO Susumu 金沢大学, 自然システム学系, 教授 (30192511)
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| Research Collaborator |
ISHIZUKA Osamu 国立研究開発法人産業技術総合研究所, 活断層・火山研究部門, 主任研究員
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 沈み込み帯 / 初生マグマ / オマーンオフィオライト / 無人岩 |
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| Outline of Final Research Achievements |
Based on the volcanology of infant arc volcanic edifices in the Oman Ophiolite, and the temporal geochemical changes, subduction initiation is revealed as follows: (1) paleo-arc volcanos composed of piled-up volcanos with several vents 2-5 km interval; (2) geochemical change from arc tholeiite to boninite magma was quantitively explained by contribution rate between slab-derived fluid and sedimentary melt; (3) Mantle potential temperature of the paleo-infant arc magma is estimated to 1400 °C. It is correlated with proto-arc spreading magmatism, and supported by our high-temperature subduction initiation model.
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| Free Research Field |
火山学、岩石学
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