1989 Fiscal Year Final Research Report Summary
Trans-Pacific correlation of Neogene geologic events
| Project/Area Number |
63041065
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| Research Category |
Grant-in-Aid for Overseas Scientific Survey.
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | Shizuoka University |
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Principal Investigator |
TSUCHI R. Professor, Geoscience Institute, Fac. Sci., Shizuoka University, 理学部, 教授 (60021929)
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| Co-Investigator(Kenkyū-buntansha) |
IBARAKI M. Res. Assistant, Geoscience Institute, Fac. Sci., Shizuoka University, 理学部, 助手 (30109128)
FUJIYOSHI A. Assoc, Professor, Geological Institute, Fac. Educ., Shizuoka University, 教育学部, 助教授 (00022202)
野村 律夫 島根大学, 教育学部, 助教授 (30144687)
KOIZUMI I. Professor, Inst. Geol. and Mineral, Fac. Sci., Hokkaido University, 理学部, 教授 (20029721)
首藤 次男 九州大学, 名誉教授
NOMURA R. Assoc, Professor, Geological Institute, Fac. Educ., Shimane University
SHUTO T. Professor Emeritus of Kyushu University
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| Project Period (FY) |
1988 – 1989
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| Keywords | Biosiliceous Sediments / Upwelling / Pacific Ocean / Correlation / Accelerated Evolutionary Events / Neogene Events / Climatic Optimum / South America |
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| Research Abstract |
The purpose of the project is to correlate key Neogene events in Japan with those on the Pacific side of South America. Field works in Colombia, Ecuador, Peru and Chile were carried out in 1988 with collaborators of these countries. In 1989, a special symposium was held in Chile in conjunction with the 6th Inter-Congress of the Pacific Science Association. Based on evidences of the field examination, almost synchronous occurrences of some key Neogene events in both sides of the Pacific Ocean were elucidated. Those are: 1) the Mid-Neogene climatic optimum around 16 Ma; the Camana Foramation in southern Peru, including tropical larger foraminifera, was dated at about 16 Ma by means of planktonic foraminifera; 2) upwelling and cooling events since Middle Miocene time at about 15 Ma; biosiliceous sediments become predominant after the climatic optimum; and 3) accelerated evolutionry events recognized in endemic mollusca during the latest Neogene since 3 Ma; a turritellid molluscan bio-series in northern Chile exhibits also an accelerated evolutionary change since 3 Ma.
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