2013 Fiscal Year Final Research Report
Reconstruction of sub-bottom section of geologic methane-seep site - variety of seep activity indicated by fossil chemosynthetic communities
| 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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| Keywords | 化学合成生態系 / メタン湧水 / 深海生態系 / 古生態学 |
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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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Research Products
(18 results)
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[Journal Article] Variation in stable carbon and oxygen isotopes of individual benthic foraminifera : tracers for quantifying the magnitude of isotopic disequilibrium2012
Author(s)
Ishimura, T., Tsunogai, U., Hasegawa, S., Nakagawa, F., Oi, T., Kitazato, H., Suga, H., Toyofuku, T
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Journal Title
Biogeosciences
Volume: 9
Pages: 4353-4367
DOI
Peer Reviewed
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[Journal Article] Biogeochemical processes involving acetate in sub-seafloor sediments from the Bering Sea shelf break2012
Author(s)
Ijiri, A., Harada, N., Hirota, A., Tsunogai, U., Ogawa, N.O., Itaki, T., Khim, B-K., Uchida, M
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Journal Title
Organic Geochemistry
Volume: 48
Pages: 47-55
DOI
Peer Reviewed
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[Presentation] NT10-19 Leg2 の調査概要:海底下を包含したメタン湧水生態系の解明を目指して2011
Author(s)
ジェンキンズロバート, 野崎 篤, 宇都宮正志, 佐藤 圭, 延原尊美, 渡部裕美, 小栗一将, 清家弘治, カイム・アンドレイ, 佐藤瑞穂, 高橋正樹, 沼田章吾, 三本菅優作, 新谷美久帆, 坂井三郎
Organizer
日本地球惑星科学連合2011年大会
Place of Presentation
幕張メッセ国際会議場, 千葉県
Year and Date
2011-05-22
