2023 Fiscal Year Final Research Report
Long-term observation of hot spring silica deposits for reconstruction of ancient environment and microbial community
| Project/Area Number |
19K04058
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | Saga University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
狩野 彰宏 東京大学, 大学院理学系研究科(理学部), 教授 (60231263)
奥村 知世 高知大学, 海洋コア総合研究センター, 准教授 (90750000)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | シリカ堆積物 / 縞状組織 / 微生物 |
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| Outline of Final Research Achievements |
n this study, we will search for clues about the environment and microbial communities in the Precambrian period, which are still unexplained. We focused the hot spring silica deposit that is very similar to Precambrian sedimentary rocks and studied the cycle and formation process of the laminations of silica deposits. Silica deposits have two of scale laminations. One is milli-order scale lamination that reflect seasonal changes. The other is micron-order scale lamination that may reflect the microbial metabolism only in summer.
These results provide clues to the formation process of Banded Iron Formations and stromatolites in the Precambrian period, as well as the microbial communities at that time.
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| Free Research Field |
地球生命科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，いまだに未解明である先カンブリア時代の環境や微生物群衆の手がかりを探るため，当時の堆積岩のモダンアナログである温泉成シリカ堆積物の縞状組織の周期や生成過程について研究を行った.シリカ堆積物に発達するミリオーダーとミクロンオーダーの２つの縞状組織はそれぞれ，季節変化や夏季限定で起こる微生物代謝を反映している可能性があることが示された．この結果は，先カンブリア時代の縞状鉄鉱層やストロマトライトの周期や生成過程，及び当時の微生物群衆を解き明かす手がかりになる．
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