2007 Fiscal Year Final Research Report Summary
Submarine canyon formations and tectonics and climate changes in late Pliocene on forearc shelfin northern Japan
| Project/Area Number |
18540451
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Shinshu University |
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Principal Investigator |
HOYANAGI Koichi Shinshu University, Fac Science, Associate Professor (30202302)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Pliocene / Dainenii Formation / shelf / organic matter / climate change / submarine canyon / stable carbon isotope / diatom fossil |
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| Research Abstract |
Pliocene Dainenji Formation is distributed in the Pacific side of the Fukushima Prefecture. The Dainenji Formation is deposited on shelf environment and consists mainly of sandy siltstone and sandstone. It includes a number of volcanic ash layers, which serve as good key beds useful for precise correlation. Its depositional age is from 4.18 to 2 Ma. We carried out facies and geochemical analyses, such as total organic carbon (TOC), total sulfur (TS), and stable carbon isotope ratio of organic matter (δ^(13)C_org). The results are as follows: (1) Abundant land-derived organic matter was transported to the shelf and was preserved in the sediment in warm period (3.75-305 Ma). (2) productivity of marine organisms increased in the early cooling period (3.5-3.35 Ma),. (3) The considerable variations in TS, TOC andδ^(13)Corg are seen in cooling stage after 3 Ma, which succeeded to the Quaternary ice age. These considerable variations are shown inδ^(18)O curve of the same age.
Mappable units of submarine canyon-fill sediment are recognized in this area. A valley has a maximum depth of 100 m and is considered to be formed by submarine landslide, which took place after 2.7 Ma. Submarine canyon-fill sediments are composed of siltstone interbedded with thin sandstone layers, thick sandstone beds and slump deposits. Formation and filling of the submarine canyon might be controlled by climate cooling of latest Pliocene age.
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Research Products
(34 results)
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[Journal Article] Relationship between shelf sedimentation and climate changes in the upper Pliocene Dainenji Formation in Fukushima, northern Japan2007
Author(s)
Kondo, H., Osano, Y., Yoshida, M., Hoyanagi, K., Yanagisawa, Y
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Journal Title
J. Sediment Soc. Japan 64
Pages: 77-81
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Sequence stratigraphy and organic matter preservation of the Miocene to Pliocene Tatsunokuchi Formation, Iwate, Northeast Japan2007
Author(s)
Yoshida, M.,Hoyanagi, K., Kondo, H., Inoue, H.,Oishi, M., Yoshida, H., Yanagisawa, Y
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Journal Title
J. Sediment. Soc. Japan 64
Pages: 21-26
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Relationship between climate change and shelf sedimentation, based on sedimentary facies and organic matter analyses of the Pliocene Dainenji Formation, Fukushima, northern Japan2007
Author(s)
Kondo, H., Hoyanagi, K., Osano Y., Yanagisawa, Y
Organizer
Sediment. Soc. Japan
Place of Presentation
Tsukuba, Japan
Year and Date
2007-08-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Relationship between occurrence of flood-generated turbidity currents and environmental changes in a lagoon : an example from Holocene sediments, Niigata Plain, central Japan2007
Author(s)
Yoshida, M., Hoyanagi, K., Yoshiuchi, Y., Ishida, K
Organizer
Sediment. Soc. Japan
Place of Presentation
Tsukuba, Japan
Year and Date
2007-03-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] A high-resolution analysis of environmental changes for estuarine sediments, an example from the Pliocene Tatsunokuchi Formation, Iwate, north Japan2006
Author(s)
Yoshida, M., Hoyanagi, K., Kondo, H., Inoue, H., Oishi, M., Yoshida, H. and Yanagisawa, Y.
Organizer
17th International Sedimentological Congress
Place of Presentation
Fukuoka, Japan
Year and Date
2006-08-31
Description
「研究成果報告書概要(和文)」より
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[Presentation] Relationship between shelf sedimentation and climate changes in the upper Pliocene Dainenji Formation in Fukushima, northeastern Japan2006
Author(s)
Kondo, H., Osano, Y., Yoshida, M., Hoyanagi, K. and Yanagisawa, Y.
Organizer
17th International Sedimentological Congress
Place of Presentation
Fukuoka, Japan
Year and Date
2006-08-31
Description
「研究成果報告書概要(和文)」より
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[Presentation] Relationship between shelf sedimentation and climate changes in the upper Pliocene Dainenji Formation in Fukushima northeastern Japan2006
Author(s)
Kondo, H., Osano, Y., Yoshida, M., Hoyanagi, K., Yanagisawa, Y
Organizer
17th International Sedimentological Congress
Place of Presentation
Fukuoka, Japan
Year and Date
2006-08-31
Description
「研究成果報告書概要(欧文)」より
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