1986 Fiscal Year Final Research Report Summary
GEOLOGICAL STUDY OF THE DAIICHI-KASHIMA SEAMOUNT
| Project/Area Number |
59420016
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | TOKAI UNIVERSITY; FACULTY OF MARINE SCIENCE AND TECHNOLOGY |
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Principal Investigator |
SATO TAKESHI JUNIOR PROFESSOR, FACULTY OF MARINE SCIENCE AND TECHNOLOGY,TOKAI UNIVERSITY, 海洋学部, 助教授 (70056092)
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| Co-Investigator(Kenkyū-buntansha) |
IZU SHINNOSUKE LECTURER, JUNIOR COLLEGE, TOKAI UNIVERSITY, 短期大学部, 講師 (50142617)
NEMOTO KENJI LECTURER, FACULTY OF MARINE SCIENCE AND TECHNOLOGY, TOKAI UNIVERSITY, 海洋学部, 講師 (70164663)
SHIBASAKI TATSUO MEMBER OF THE SCIENCE COUNCIL OF JAPAN, 会員 (30130066)
HOSHINO MICHIHEI PROFESSOR, FACULTY OF MARINE SCIENCE AND TECHNOLOGY, TOKAI UNIVERSITY, 海洋学部, 教授 (90055624)
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| Project Period (FY) |
1984 – 1986
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| Keywords | Daiichi-kashima seamount / Trench / Sealevel / Plate tectonics / Cretaceous / 平頂海山 |
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| Research Abstract |
The Daiichi-kashima Seamount is located at the junction of the Japan and the Izu-Bonin trenches. Based on topographic charactor, it is proposed that the western half of the seamount was collapsed along the trench axis accomanied with a subduction of the moving Pacific Plate. This idea was broadly proclamed and become one of the most scientific topics in Japan. We have carried out intensive investigations including seismic reflection profiling, precision depth recording, magnetic surveying and dredging. The results are not consistent with plate tectonic model but rather suggestive of geological development related to global sea-level changes. Based on our geological investigation the structure and subsurface geology of the seamount is not explainable in terms of plate tectonic theory but directly connected with a global sea-level change. The formation of several terraces on and around the seamount and drowing of reef structures are thought to have resulted from eustatic sea-level changes during Mesozoic.
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