2022 Fiscal Year Final Research Report
Evaluation of the usefulness for invisible annually laminated sediments as paleoenvironmental archives
| Project/Area Number |
21K18405
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 4:Geography, cultural anthropology, folklore, and related fields
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| Research Institution | Waseda University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
藤木 利之 岡山理科大学, 理学部, 准教授 (10377997)
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Keywords | 年縞 / ヘドロ / 古環境アーカイブ / 湖沼 / 八郎潟 / 中海 / 駿府城 |
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| Outline of Final Research Achievements |
In this study, we examined the usefulness of "invisible annual stripes" as a new archive (paleoenvironmental recorder) to precisely record paleoenvironments. We collected undisturbed surface strata from dredged hollows in Nakamai Lagoon, Shimane Prefecture and Hachiro-gata Reservoir, Akita Prefecture, where non-visible annual stripes are likely to have been deposited over the past 200 years. We conducted a comprehensive analysis of the cores to construct a chronological model and to reconstruct the paleoenvironment.
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| Free Research Field |
自然地理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究によって、一般的に“ヘドロ”と呼ばれる黒色有機泥に、当該水域の自然年表を作成できる季節～年解像度をもつ年縞の形成が確認されれば、精緻に復元できる場所や時代（時間）が著しく増大する。広く古環境学的研究分野において、“目に見えない土の年輪”が新しい古環境アーカイヴとしての有用性が証明されれば、これまで実施されている様々な環境プロキシを駆使して、さらなる地球環境史の解明につながるものである。
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