2021 Fiscal Year Final Research Report
High-resolution polymineral fine-grain OSL dating of deep marine sediment: A case study from the Sea of Japan
| Project/Area Number |
17K14408
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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 |
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Principal Investigator |
Sugisaki Saiko 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (20595128)
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| Project Period (FY) |
2017-04-01 – 2022-03-31
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| Keywords | 光ルミネッセンス年代測定 / ポリミネラル微粒子 / 日本海 |
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| Outline of Final Research Achievements |
The construction of accurate chronological models is very important to understand past ocean and climate changes. We test the potential of a post-IR IRSL signal (pIRIR230) from polymineral fine-grains to date Quaternary hemi-pelagic sediments in the Japan Sea beyond MIS5e. Down the long cores equivalent doses increase with depth, up to ~1000 Gy. Average g-value of pIRIR230 is 1.60±0.58%/decade, the pIRIR230 ages are in good agreement with tuned age models, with field saturation reached at ~300ka.
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| Free Research Field |
光ルミネッセンス年代測定
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は, 日本海堆積物のポリミネラル微粒子を対象に，カリ長石のOSL 年代測定法の測定限界を高解像度で連続的な年代測定を行い，約30万年前までの年代測定が可能であり他の年代モデルと整合的であることを示した．最終間氷期以前の絶対年代制約が可能になることによって，古気候・古海洋学の分野全体に貢献できる重要な成果である．
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