The birthplace of eukaryote in the Paleoproterozoic
| Project/Area Number |
19K14828
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | Okayama University of Science (2022)
Tokyo Institute of Technology (2019-2021) |
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Principal Investigator |
Sato Tomohiko 岡山理科大学, 基盤教育センター, 准教授 (80714831)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 前期原生代 / 真核生物 / 炭素同位体 / 酸化還元 / ガボン / 化石 / 同位体層序 / 原生代 |
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| Outline of Research at the Start |
地球生命史において, 真核生物の誕生は最も重要な転換点の一つである. しかし, 一体どのような環境下でその進化が起こったのかは, 未だ謎に包まれている. 真核生物とされる最古の化石は, アフリカ・ガボンの前期原生代 (約22億年前) の地層から発見されている. 本研究では, これらの化石群について, 3次元構造観察および局所分析を行い, 真核生物起源か否かを検証する. また, ガボンの複数地域において地質調査を行い, 化石の時間・空間分布を明らかにする. さらに, 採取した岩石試料の化学分析により, 真核生物出現前後の環境変動を解読し, 真核生物の進化に必要な条件の解明を試みる.
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| Outline of Final Research Achievements |
In the Earth's history, the Paleoproterozoic Franceville Basins in Gabon is regarded as the birthplace of eukaryote. In order to clarify the temporal and spatial distribution of the biological evolution and the environmental changes in that period, this study conducted the geological fieldwork and inter-regional stratigraphic correlation of litho-facies, fossils, carbon and nitrogen isotopes, etc. In the Lastourville sub-basin, which was located in shallower ocean than the Franceville sub-basin, gradual changes in both carbon and nitrogen isotope ratios were identified. It suggests a gradual change into an anaerobic condition before the appearance of the eukaryotic fossils.
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| Academic Significance and Societal Importance of the Research Achievements |
真核生物の誕生は, 地球生命史における最も大きな進化のジャンプである. その進化がいつどのような環境で起きたのかを地質学・層序学的に解読することは, 生物進化の必要十分条件を解明する鍵として, 地球科学だけでなく生物学においても重要な意義を持つ. 本研究課題で得られた成果を下敷きに, ガボンにおける国際的な陸上掘削プロジェクトも動き始めており, 前期原生代の研究が今後さらに活発化していくと予想される.
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Report
(5 results)
Research Products
(16 results)
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[Journal Article] Depositional condition of Paleoproterozoic Francevillian carbonate rocks revisited from rare earth element contents2023
Author(s)
Yoshida, S., Bakakas, K.M., Ishihara, Y., Moussavou, M., Asanuma, H., Sato, T., Hirata, T., Ligna, C., Sawaki, Y., Edou-Minko, A.
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Journal Title
Geochimica et Cosmochimica Acta
Volume: －
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Zircon geochronology of the Paleoproterozoic Magondi Supergroup in Zimbabwe: Age constraints to the Lomagundi-Jatuli event.2019
Author(s)
Sawada, H., Mugandani, E., Sato, T., Sawaki, Y., Sakata, S., Isozaki, Y., Maruyama, S.
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Journal Title
Terra Nova
Volume: 31
Issue: 5
Pages: 438-444
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] The depositional setting of Francevillian Group, Gabonese Republic, revisited from REE geochemistry2023
Author(s)
Yoshida, S., Asanuma, H., Sato, T., Sawaki, Y., Hirata, T.
Organizer
Japan Geoscience Union Meeting 2023
Related Report
Int'l Joint Research
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[Presentation] Multiple sulfur isotope geochemistry of pyrites in black shales of the Paleoproterozoic Francevillian successions, Gabon2023
Author(s)
Kurihara, A., Sato, T., Sawaki, Y., Moussavou, M., Ueno, Y.
Organizer
Goldschmidt 2023 Conference
Related Report
Int'l Joint Research
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[Presentation] The demise of the positive carbon isotope excursion in the Paleoproterozoic Francevillian Basins, Gabon.2020
Author(s)
Sato, T., Sawaki, Y., Maruyama, S., Bakakas, K., Ligna, C., Moussavou, M., Edou-Minko, A.
Organizer
Japan Geoscience Union-American Geophysical Union Joint Meeting
Related Report
Int'l Joint Research
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