2005 Fiscal Year Final Research Report Summary
Paleomagnetic study on deformation of the eastern part of the Asian continent
| Project/Area Number |
14403010
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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 | 海外学術 |
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| Research Field |
Geology
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| Research Institution | Kobe University |
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Principal Investigator |
OTOFUJI Yo-ichiro Kobe University, Faculty of Science, Professor, 理学部, 教授 (90160895)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAKUCHI Satoru Kobe University, Faculty of Science, Lecturer, 理学部, 講師 (70191228)
FUJITA Kiyoshi Kobe University, Faculty of Science, Assitant Professor, 理学部, 助手 (00283862)
YAMASAKI Kazuhito Kobe University, Faculty of Science, Assistant Professore, 理学部, 助手 (20335417)
INOKUCHI Hiroo University of Hyogo, School of Human Science and Environment, Professor, 環境人間学部, 教授 (40112073)
ITOTA Chizu Taisei Gakuin University, Faculty of Human Science, Associated Professor, 人間学部, 助教授 (80246800)
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| Project Period (FY) |
2002 – 2005
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| Keywords | Paleomagnetism / Tectonics / Continent / Collision / Mesozoic / Cenozoic |
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| Research Abstract |
The eastern part of the Asian continent was formed by sequential welding of five micro continents during Paleozoic and Mesozoic eras (Siberian craton, Mongolia block, North China Block, South China Block (SCB) and India). We focus deformation of the eastern part of Asia associated with these collision events. We propose deformation modes in continental southeast Asia on the basis of paleomagnetic studies of Triassic to Eocene strata for the Mongolia block, SCB and Southeast Asia
1.Counter-clockwise rotation is observed in the eastern part of the Mongolia block. This rotation is ascribed to post-Late Cretaceous extension that affected the continental basins (the Middle Amur, Sanjiang, Razdolnian, Amur-Zeyn and Songliao basins) of the northeast Chinese Plain along the eastern margin of the Mongolia Block.
2.Regional deformation aspects of the SCB are inferred from Middle Triassic paleomagnetic data. An area located between 70 km and 225 km from northern margin of the SCB forms a stable platform where very little relative rotation has been detected later than the Middle Triassic. However, the inner region of this block experienced a clockwise rotation of 12° to 30° with respect to stable outer region. Areas in close vicinity of the Tan-Lu fault were subjected to post-Triassic counter-clockwise rotation by 90゜ with respect to stable tectonic belt.
3.We have recognized that three phenomena are important factors for explaining the prominent deformation aspect of Southeast Asia ; that is, fragmentation, coherent rotation and internal deformation associated with displacement. When India collided to Asia, at first, fragmentation occurred. The Chuan Dian fragment and the Shan-Thai block were separated from the continuum Asian continent. Secondly, these continental fragments experienced a coherent tectonic rotation. At the later stage of the collision event, continental fragments experienced internal deformation associated with the southward displacement.
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[Journal Article] Counter-clockwise rotation of the eastern part of the Mongolia block : Early Cretaceous palaeomagnetic results from Bikin, Far Eastern Russia2006
Author(s)
Otofuji, Y., D.Miura, K.Takaba, K.Takemoto, K.Narumoto, H.Zaman, H.Inokuchi, R.G.Kulinch, P.S.Zimin, V.G.Sakhno
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Journal Title
Geophys.J.Int. 164
Pages: 15-24
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An example of multicomponent magnetization in welded tuffs a case study of Upper Cretaceous welded tuffs of eastern Russia2003
Author(s)
Uno, K., Y.Otofuji, T.Matsuda, K.Furukawa, T.Mishima, Y.Kuniko, R.Enami, R.G.Kulinich, P.S.Zimin, A.P.Matunin, V.G.Sakhno
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Journal Title
J.Asian Earth Sci. 21
Pages: 431-439
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Late Cretaceous paleomagnetic results from Sikhote Alin, Far Eastern Russia : TEct onic implications for the eastern margin of the Mongolia block2003
Author(s)
Otofuji, Y., T.Matsuda, R.Enami, K.Uno, K.Nishiliama, N.Hahn, L.Su, H.Zaman, R.G.Kulinich, P.S.Zimin, A.P.Matunm, V.G.Sakhno
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Journal Title
Geophys.J.Int. 152
Pages: 202-214
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Internal deformation of Sikhote Alin volcanic belt, Far Eastern Russia, Paleocene paleomagnetic results2002
Author(s)
Otofuji, Y., T.Matsuda, R.Enami, K.Uno, K.Nishihama, R.G.Kulinichi, P.S.Zimin, A.P.Matunin, V.G.Sakhno
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Journal Title
Tectonophys. 350
Pages: 181-192
Description
「研究成果報告書概要(欧文)」より
