2011 Fiscal Year Final Research Report
Extrusion wedge of the Sambagawa high P-T metamorohic rocks
| Project/Area Number |
20540441
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Tohoku University |
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Principal Investigator |
OSOZAWA Soichi 東北大学, 大学院・理学研究科, 講師 (40160866)
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| Project Period (FY) |
2008 – 2011
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| Keywords | 三波川変成岩 / エクストルージョン / デタッチメント断層 / OST / デュープレックス / エクロジャイト |
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| Research Abstract |
The Sambagawa high P/T metamorphic zone, central Shikoku, is reginally mapped. Mapping is based on dividing metamorphic mineral zones into the Oboke psammitic schist, main chrolite, chlorite L tectonite, garnet, albite-biotite, and oligoclase-biotite zones. Additionary, characteristic lithologies of psammitic schist, calcareous schist, piemontite siliceous schist, mafic schist, amphibolite, eclogite, metamorphosed ultramafic rocksare are also mapped. Exhumation was carried out by wedge extrusion associated with detachment faulting, followed by out-of-sequence thrusting associated with duplexiing, and then uplight folding. The Median Tectonic Line should be a root of the Sambagawa metamorphic rocks. Eclogite might have been derived from the Mikabu ophiolite.
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[Journal Article] Supra subduction zone chemistry of intrusions into a Miocene accretionary prism, southwest Japan : A consequence of ridge subduction?2012
Author(s)
Osozawa, S, Shinjo, R., Ishikawa, K., Sasaki, M., Ito, Y., Watanabe, Y., and Wakabayashi, J.
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Journal Title
Journal of Asian Earth Sciences
Peer Reviewed
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[Journal Article] Paleogeographic reconstruction of the 1. 55 Ma synchronous isolation of the islands of Ryukyu, Japan, and Taiwan, and inflow of the Kuroshio warm current2012
Author(s)
Osozawa, S., Shinjo, R., Armid, A., Watanabe, Y., Horiguchi, T., Wakabayashi, J.
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Journal Title
International Geology Review
Volume: 53
Pages: 20
DOI
Peer Reviewed
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[Journal Article] Structural evolution of the Bayanhongor region, west-central Mongolia2008
Author(s)
Osozawa, S, Tsolmon, G., Majigsuren, U., Jargalan, S., Niitsuma, S., Iwata, N., Pavlis, T., and Bor-ming Jahn
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Journal Title
Journal of Asian Earth Asciences
Volume: 33
Pages: 337-352
DOI
Peer Reviewed
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