Elucidating the linkage between changes of marine ecosystems and deposition of deep sea mud highly enriched in rare earth elements
| Project/Area Number |
21K20354
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
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| Research Institution | Chiba Institute of Technology |
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Principal Investigator |
Mimura Kazuhide 千葉工業大学, 次世代海洋資源研究センター, 主任研究員 (10909435)
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 海底鉱物資源 / レアアース泥 / 微化石 / 機械学習 / 画像認識 / イクチオリス / オスミウム同位体比層序 / 深層学習 |
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| Outline of Research at the Start |
本研究は，新規海底鉱物資源として注目される「レアアース泥（レアアース元素を豊富に含む深海堆積物）」が，いつ・どこで・どのように形成されたのかを解明することによって，将来重点的に資源探査を行うべき海域を明らかにすることを目的とする．
このために，海洋中の極微量元素であるオスミウムの同位体比を測定することによって高品位な資源が堆積した年代を精緻に決定する．さらに，機械学習によって大量の魚類の歯や鱗の微化石を観察することで，レアアース泥の品位に大きく影響する魚類の生産性が，時代を通じてどのように変遷したかを明らかにする．
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| Outline of Final Research Achievements |
This study aimed to elucidate the linkage between deposition of deep-sea mud highly enriched in rare earth elements, termed as REE-rich mud, and changes of marine ecosystems. In this study, deep-learning based system to detect microfossil fish teeth and denticles, called “ichthyoliths” from microscopic images, was constructed. Using the system, ichthyoliths were observed from deep-sea sediments obtained at various areas of the Pacific Ocean. Based on the observation, it was suggested that redeposition of older sediments affected the occurrence of mud high grade REE-rich mud.
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| Academic Significance and Societal Importance of the Research Achievements |
イクチオリスを用いた海洋生態系変遷史の解読は近年大きな注目を集めているが，熟練の技術を持つ観察者が時間をかけて実施する必要があることから十分な観察が進んでいなかった．本研究で確立した観察技術により，網羅的なイクチオリス観察が可能になり，今後層序学や古環境学の議論を大きくアップデートすることが期待される．さらに，この技術はあらゆる微化石や粒子鉱物の観察に適用可能であることから，学術的・社会的意義の大きい成果であるといえる．
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Report
(3 results)
Research Products
(26 results)
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[Journal Article] The age and origin of the Ruwai polymetallic skarn deposit, Indonesia: evidence of Cretaceous mineralization in the Central Borneo metallogenic belt2023
Author(s)
Cendi, D. P. D., Agangi, A., Idrus, A., Chelle-Michou, C., Lai, C., Ishida, M., Guillong, M., Gonzales-Alvarez, I., Takahashi, R., Yano, M., Mimura, K., Ohta, J., Kato, Y., Simbolon, D. R., Xia, X.
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Journal Title
Economic Geology
Volume: -
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] Paleogene Seawater Os Isotope Record of the Indian Ocean: Implications for the chemical weathering feedback against Eocene Hyperthermal Events2022
Author(s)
Kuwahara, Y., Yasukawa, K., Ohta, J., Yano, M., Mimura, K., Tanaka E., Fujinaga, K., Nakamura, K., Kato, Y.
Organizer
12th International Conference on Climatic and Biotic Events of the Paleogene
Related Report
Int'l Joint Research
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[Presentation] Geochemistry and morphology of Fe-Mn micro nodules in REY-rich mud: Implications for the formation process of highly promising deep-sea REY resource2022
Author(s)
Yasukawa, K., Kino, S., Ohta, J., Azami, K, Tanaka, E., Mimura, K., Fujinaga, K., Nakamura, K. and Kato
Organizer
3rd Edition of World Congress on Geology & Earth Science
Related Report
Int'l Joint Research / Invited
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[Presentation] Stratigraphic variations in geochemistry and morphology of Fe-Mn micronodules: Implications for the formation process of extremely REY-rich mud in the western North Pacific Ocean.2021
Author(s)
Yasukawa, K., Kino, S., Ohta, J., Azami, K., Tanaka, E., Mimura, K., Fujinaga, K., Nakamura, K. and Kato, Y.
Organizer
Goldschmidt Virtual 2021
Related Report
Int'l Joint Research
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