2017 Fiscal Year Final Research Report
In situ boron isotopic analysis of subduction-related volcanic rocks and quantitative evaluation of subduction component
| Project/Area Number |
25400519
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Research Collaborator |
ASAMI Ryuji
TOKI Tomohiro
ISHIBASHI Jun-ichiro
UNO Yoshie
KINJO Kazuki
YASUDA Keisuke
UZA Hirotaka
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| Project Period (FY) |
2013-04-01 – 2018-03-31
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| Keywords | 火山岩 / トルマリン / 海底熱水鉱床 / ホウ素 / 同位体 / 沈み込み帯 / レーザーアブレーション / ICP質量分析計 |
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| Outline of Final Research Achievements |
Effective boron separation methods (micro-sublimation and mini-column methods) from geological materials are developed. In addition, laser ablation-multiple-collector ICP mass spectrometer (LA-MC-ICP-MS) method is developed for in situ analyses of boron isotope. Repeated analyses of geological standard reference materials yielded high precision and accurate results. Annual-scale boron isotopic analyses for coral skeleton from Guam Island provide an evidence for ocean acidification in tropic Pacific seawater. Boron isotopic profile analyses for interstitial water in sediments at active hydrothermal area in Okinawa Trough demonstrate that boron isotope is an effective tracer for investigation of sub-bottom circulation pattern of hydrothermal fluids. Boron isotopic analyses by LA-MC-ICP-MS on tourmalines from Yamaguchi Prefecture indicate that fluids related to the formation of tourmaline were strongly linked to host granitic magma.
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| Free Research Field |
岩石学、地球化学
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