2012 Fiscal Year Final Research Report
The relationship between global warming/cooling and shallow marine environments in the Sea of Japan during the Pliocene
| 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)
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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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| 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 |
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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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[Presentation] Fossil ostracode faunas from the middle Pliocene Mita Formation, central Japan, with relation to warm inflow into the Sea of Japan.2012
Author(s)
Irizuki, T., Goto, T., Nasuno, S., Hayashi, H., Ohira, H
Organizer
Internal Symposium on Paleoceanography in the Southern Ocean and NW Pacific:Perspective from Earth Drilling Sciences
Place of Presentation
高知大学.(高知)
Year and Date
2012-11-19
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[Presentation] The Plio-Pleistocene boundary cooling event recorded on the Ananai Formation, Kochi, southwest Japan.2012
Author(s)
Iwatani, H., Irizuki, T., Iwai, M., Kondo, Y., Ikehara, M
Organizer
Internal Symposium on Paleoceanography in the Southern Ocean and NW Pacific:Perspective from Earth Drilling Sciences
Place of Presentation
高知大学.(高知)
Year and Date
2012-11-19
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[Presentation] Paleoceanographic change based on analyses of microfossils from the Pliocene Kuwae Formation, Niigata Prefecture, central Japan.2012
Author(s)
Goto, T., Irizuki, T., Hayashi, H., Ishida, K., Yanagisawa, Y
Organizer
Internal Symposium on Paleoceanography in the Southern Ocean and NW Pacific: Perspective from Earth Drilling Sciences
Place of Presentation
高知大学.(高知)
Year and Date
2012-11-19
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