| Project/Area Number |
59392002
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Kyoto University |
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Principal Investigator |
KOYAMA Mutsuo Research Reactor Institute, Kyoto University, 原子炉実験, 助教授 (80025329)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIWATARI Ryoshi Department of Chemistry, Faculty of Science, Tokyo Metropolitan Univ., 理学部, 教授 (90087106)
FUJI Norio Department of Education, Kanazawa Univ., 教育学部, 教授 (40019394)
NAKAMURA Toshio Isotope Research Center, Nagoya Univ., アイソトープ総合センター, 教務職員 (10135387)
NAKAI Nobuyuki Department of Geoscience, Faculty of Science, Nagoya Univ., 理学部, 教授 (40022529)
HORIE Shoji Station for Paleoenvironmental Study, Faculty of Science, Kyoto Univ., 理学部, 教授 (90025320)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥9,500,000 (Direct Cost: ¥9,500,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1984: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Lake Biwa / 1400 meter long core / paleowater depth / paleoenvironment / qlacier period / pollen analysis / micro-fossil / chlorophyll / carbohydrate / lignin |
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| Research Abstract |
Sampling if sediment-laver(20-40cm) was performed at the interval of every 3m from the top to the core depth of 800m on the 1400m long sediment core drilled from Lake Biwa. An inter-disciplinary research team was established so as to carry out the analysis of the core sample from various aspects. Namely, micro-fossils, such as pollens, and planktons, organic chemical fossils such as chlorophylls, fatty acids, carbohydrates and lignins, inorganic components from macro to trace elements and carbonisotope ratios were included.
On summarizing the results obtained, following conclusions were deduced.
1) During the period about 2.0-2.5 million years ago(core depth:804-732m), the site drille was like a swamp or a part of river with shallow water.
2) In R layer(core depth:732-582m), the water depth became a little deeper and a small lake or pond was formed.
3) In S layer(core depth:582-250), the lake water retreated and the lake disappeared.
4) In T layer(core depth:250-0m), the lake basin of the present Lake Biwa began to formed.
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