| Project/Area Number |
23540548
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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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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
IJIRI Akira 独立行政法人海洋研究開発機構, 高知コア研究所, 研究員 (70374212)
ISHIMURA Toyoho 茨城工業高等専門学校, 物質工学科, 准教授 (80422012)
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| Co-Investigator(Renkei-kenkyūsha) |
MAJIMA Ryuichi 横浜国立大学, 教育人間科学部, 教授 (30202310)
KONDO Yasuo 高知大学, 理学部, 教授 (90192583)
AMANO Kazutaka 上越教育大学, 学校教育研究科, 教授 (50159456)
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| Research Collaborator |
JENKINS Robert 金沢大学, 理工研究域自然システム学系, 助教 (10451824)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 化学合成生態系 / メタン湧水 / 深海生態系 / 古生態学 / 層位・古生物学 / 深海生物 / 白亜紀 / 新生代 / 進化 / 海洋生態 |
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| Research Abstract |
This study made clear sub-bottom cross-sections of the geological past methane-seep sites in the Eocene Poronai Formation and the Miocene Morai Formation, both of which are bathyal siltstones yielding abundant vesicomyid fossils in Hokkaido, north Japan. Detail observations of their mode of fossil occurrences and seep-carbonate blocks (scale, shape, petrology, and internal textures) indicate that the two seep-sites are contrast in style of seepage activity.
The Poronai seep is channelized focused-flow characterized by its fractured lithology due to fluid overpressure, whereas the Morai seep is diffusive and static through interspaces of clotted-mud, without such fracturing texture. These results show that chemosynthetic vesicomyid clams have utilized both types of seepage. This is related with their high mobility in semi-infaunal life position, which can provide a key to solve the question: why they have made success and flourish in the post-Cretaceous age.
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