| Project/Area Number |
18H01316
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | Kyushu University |
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Principal Investigator |
NAKANO Nobuhiko 九州大学, 比較社会文化研究院, 准教授 (20452790)
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| Co-Investigator(Kenkyū-buntansha) |
足立 達朗 九州大学, 比較社会文化研究院, 助教 (00582652)
亀井 淳志 島根大学, 学術研究院環境システム科学系, 教授 (60379691)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Keywords | ジルコン / モナズ石 / アパタイト / 同位体 / マルチ同位体 / 同位体比 / LA-MC-ICP-MS / マルチ同位体比 / TIMS / 砕屑性岩 / MC-ICP-MS |
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| Outline of Final Research Achievements |
Apatite and monazite are the waste during zircon separation, which are used for Sr and Nd measurements, respectively using laser ablation multi-collector inductively coupled plasma mass spectrometry. In this project, we successfully set up the routine from mineral separation, U-Pb dating, and Sr-Nd-Hf isotopic measurement using zircon, apatite, and monazite. This method does not require any dissolution of rocks and wet analyses, thus, it allows quite rapid and safety measurements of multi isotopes. Additionally, the isotopic data obtained from each mineral are in good agreement with those of whole rock measured by wet analyses. Using this method, we can evaluate protolith of sedimentary and metasedimentary rocks using detrital zircon, apatite, and monazite.
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| Academic Significance and Societal Importance of the Research Achievements |
堆積岩や変成堆積岩の原岩の年代や分類は，これまでは微化石に頼ることが多かったが，2000年以降は砕屑性ジルコンの年代測定が広く用いられるようになった．本研究はそれをさらに発展させ，数種類の鉱物のマルチ同位体を用いた分類を可能とした．このことは，より詳細な堆積岩の分類，堆積物の供給源の特定，堆積環境の制約を可能とし，日本列島形成史の詳細な解析に利用できることはもちろんのこと，超大陸の復元や造山帯の発達史等，地球規模の地質現象の解明に大きく寄与するものと考えられる．
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