| Project/Area Number |
22540476
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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 |
Stratigraphy/Paleontology
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| Research Institution | Shimane University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Hiroki 島根大学, 総合理工学研究科, 准教授 (80399360)
石田 桂 信州大学, 理学部, 准教授 (80402098)
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| Research Collaborator |
IWATANI Hokuto The University of Hong Kong, Department of Earth Sciences、Swire Institute of Marine Science, Postdoctoral Fellow
GOTO Takashi 島根大学, 総合理工学研究科, 博士
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 貝形虫 / 浮遊性有孔虫 / 鮮新世 / 微量元素分析 / 日本海 / 海水準変動 / 古水温 / 鮮新統 / 貝形虫化石 / 環境変動 / 層位・古生物学 / 地質学 |
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| Research Abstract |
Fossil ostracode and planktonic foraminiferal faunal analyses and trace element analysis of ostracode valves were conducted to reconstruct paleoenvironments such as timing of inflow of warm-water current, relative sea-level changes, and paleotemperature, in the Sea of Japan during the Pliocene. As a result, the inflow of the warm-water current to the Sea of Japan started at 3.66-ca. 3.4 Ma and it occurred frequently afterwards. Sea-level lowering possibly caused by the global cooling at MIS M2 was found and the decrease in water depth was estimated at 50 m at most. On the basis of Mg/Ca ratio of ostracode valves, paleotemperature in the intermediate water mass off Niigata was probably ca. 5 °C higher than now.
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