2013 Fiscal Year Final Research Report
Exhumation processes of the high-P metamorphic rocks constrained by integrated radiogenic ages of zircon in the clasts of the Miocene conglomerates
| Project/Area Number |
23540537
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Waseda University |
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Principal Investigator |
TAKAGI Hideo 早稲田大学, 教育・総合科学学術院, 教授 (60154754)
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| Co-Investigator(Renkei-kenkyūsha) |
SANO Yuji 東京大学, 大気海洋研究所, 教授 (50162524)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 地質時代 / テクトニクス / 層序 / 放射年代 / 変成岩 |
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| Research Abstract |
Exhumation processes of high pressure type metamorphic rocks (Sanbagawa metamorphics) was examined using various radiogenic dating method (phengite K-Ar, zircon fission-track and zircon U-Pb) for the schist samples from exposures and from the clasts of Miocene and Eocene conglomerates in Shikoku and Kanto. Our results are as follows; (1) The exhumation age of the clasts in the older (Eocene) conglomerate is older than those in the Miocene conglomerate and even than schists from current exposures, except the case of Eocene conglomerate in the Shimanto Belt in Shikoku. (2) Protolith of the Sanbagawa metamorphics dated is early Late Cretaceous, therefore is correlative with the accretionary complex of the Shimanto belt. (3) Duration time of the exhumation of the Sanbagawa metamorphics is estimated about 60 m.y., longer than previously estimated.
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Research Products
(15 results)
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[Journal Article] Geological framework and fission track dating of pseudotachylyte of the Atotsugawa Fault, Magawa area, central Japan2013
Author(s)
Takagi, H., Tsutsui, K., Arai, H., Iwano, H. and Danhara, T
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Journal Title
Island Arc
Volume: 22
Pages: 318-337
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[Journal Article] Integrated estimates of the thickness of the fault damage zone in granitic terrain based on penetrative mesocracks and XRD analyses of quartz2012
Author(s)
Takagi, H., Takahashi, K., Shimada, K., Tsutsui, K., Miura, R., Kato, N. and Takizawa, S
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Journal Title
Journal of Structural Geology
Volume: 35
Pages: 64-77
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[Journal Article] The first (U-Th)/He thermochronology of pseudotachylyte from the Median Tectonic Line, southwest Japan.2012
Author(s)
Yamada, K., Hanamuro, T., Tagami, T., Shimada, K., Takagi, H., Yamada, R. and Umeda, K
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Journal Title
Journal of Asian Earth Sciences
Volume: 45
Pages: 17-23
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