2006 Fiscal Year Final Research Report Summary
Reconstruction of high-resolution paleogeography in the Plio-Pleistocene
| Project/Area Number |
16300297
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Tokyo Metropolitan University, |
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Principal Investigator |
YAMAZAKI Haruo Tokyo Metropolitan Univ., Grad. School.Urban Env.Sci., Prof., 都市環境科学研究科, 教授 (70260784)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAOKA Shinji Nagasaki Univ., Faculty of Educatiion, Associate Prof., 教育学部, 助教授 (80244028)
YAMAGATA Kohtaro Joetsu Univ. Education, College of Education, Ass.Prof, 学校教育学部, 助教授 (80239855)
SUGAI Toshihiko Univ. Tokyo, Graduate School of Frontier Sci, Prof., 地球科学情報研究部門, 主任研究員 (90251321)
UEKI Takeyuki AIST, Geological Survey of Japan, Geologist, 地球科学情報研究部門, 研究員 (40371025)
MIZUNO Kiyohide AIST, Gological Survey of Japan, Senior Geologist (20358097)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Tephroch ronology / Reconstruction of paleogeography / Pliocene tephra / High-resolution chronology / Plio-Pleistocene / Correlation of wide-spread tephra / Histrical development of landforms / Reconstruction of paleoenvironment |
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| Research Abstract |
Stratigraphy and chronology of the late Neogene sedimentary basins in Japan were investigated through the correlation of widespread teparas derived from the huge volcanic eruption in the Plio-Pleistocene. The paleo-geography and landform development of several major plains in Japan were revealed by these geological data. Main results obtained by this study are as follows.
1. We found at least 12 layers of widespread Plio-Pleistocene tephras between 4 Ma (million years ago) to 1 Ma including Shikito-Yallowl tephra from at 1.3 Ma from mid-Kyushu. These tephras mark the prominent time index of several hundred thousand years interval and greatly contributed to the advancement of accuracy and resolution of Plio-Pleistocene sediments.
2. The Sakai volcanic ash (4.1Ma) which found in our research is the oldest widespread tephra known in Japan and consists of very fine volcanic glass with alkalic petrochemical composition.
3. This study promoted the correlation of widespread tephras between the a
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sh layers in the boring core samples obtained from the underground of the Kanto Plain and the ash layers in Boso Peninsula and Tama Hills. The paleo-geography of the western Kanto Plan at 0.6Ma and activity of the Fukaya-Ayasegawa fault zone were revealed by using these tephra data.
4. Underground geological structure of the Kanto Plain improved by tephra researches revealed that the movements of active faults in K into are rejuvenation of the old basement fractures formed at 15Ma in the opening stage of Japan Sea.
5. Tephra data in various part of Hokkaido were compiled in this study. We revealed the active history of Toya volcano in the Pleistocene.
6. The stratigraphy and landform development of the Miyazaki Plain in the Plio-Pleistocene were revealed in detail by this study using tephrochronology.
7. The relationship between the activity of Asama volcano in the Pleistocene and the outflow process of mudflow from Asama volcano an I the landform development of the region were revealed by this study using precise tephra correlation.
8. The tephra correlation and chronological techniques improved by our study were applied to the paleo-anthropologic research in Ethiopia. Less
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Research Products
(26 results)
