| Project/Area Number |
25610151
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Osaka City University |
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Principal Investigator |
EZAKI Yoichi 大阪市立大学, 大学院理学研究科, 教授 (60221115)
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| Co-Investigator(Kenkyū-buntansha) |
GOTO Shinsuke 大阪市立大学, 大学院理学研究科, 准教授 (70347483)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 微生物岩 / ストロマトライト / ラミナ / バクテリア / 鉱物 / 地球生物学 / シアノバクテリア / 光合成 / 環境変動 / 層位・古生物 / 地質学 |
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| Outline of Final Research Achievements |
Laminae, which are a characteristic feature of stromatolites, vary in their origin according to the time in geological history and depositional environment. The microbes responsible for stromatolite growth include not only oxygenic photosynthetic bacteria, but also anoxygenic photosynthetic bacteria and chemosynthetic bacteria, thereby facilitating the precipitation of minerals such as calcium carbonate. In addition to mineral precipitation, the dissolution of minerals and the development of destructive textures (e.g., micritisation) through endolithic activity contribute to laminae formation via complex interactions. The periodicity of laminae indicates different time cycles. Specific accumulation patterns of laminae (e.g., the conical stromatolite growth form that is unique to Conophyton) possibly provided a defense against intense (ultraviolet) light during the Precambrian.
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