2004 Fiscal Year Final Research Report Summary
Metamorphic history of the lower crust, in the east end of the SW Japan Arc
| Project/Area Number |
14540420
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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 | NIIGATA UNIVERSITY |
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Principal Investigator |
SHIMURA Toshiaki Niigata University, Faculty of Science, Associate Professor, 理学部, 助教授 (70242451)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Uetsu area / granite / metamorphism / UHT / granulite / Cretaceous / Ryoke Belt / lower crust |
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| Research Abstract |
Plutonic and volcanic rocks of Cretaceous to Paleogene age are widely distributed in the Uetsu area, northern Japan. These plutonic suites have been emplaced into the Ashio Belt, a pre-Cretaceous accretionary complex. The correlation between the Uetsu area and the SW Japan is still in discussion. The purpose of this study is to make clear the metamorphic history of this area.
The main results are as follows.
Metamorphic grade of the Sumikawa xenoliths is from amphibolite facies to granulite facies. The metamorphic P-T-t path is clockwise.
Awataki metamorphics can be subdivide to peraluminous granite origin and pelitic-psammitic rock origin. Two stages metamorphism can be recognized, the first stage is regional metamorphism and the second is contact metamorphism. Both of these are amphibolite facies.
Metamorphic grade of the Iide metamorphics is amphibolite facies.
The Sumikawa xenoliths and Awataki meramorphics are the source rocks of the Cretaceous granite. The lower most crust of the Uetsu area reached to the ultrahigh-temperature metamorphism. The metamorphic rocks and Cretaceous plutonic rocks of the Uetsu area are thought to be the Ryoke-Belt. On the other hand Paleogene igneous rocks are correlated to the Sanin-Belt.
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Research Products
(14 results)
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[Journal Article] Crustal evolution of the Uetsu area, northern Japan : correlation with the SW Japan and Sikhote-Alin2005
Author(s)
Shimura, T., Takahashi, Y, Kagashima, S., Kawai, T., Ando, S., Kobayashi, M., Ochiai(Okuda), R., Yokokawa, N.
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Journal Title
The Geologica Society of Japan News (in press)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Variety and genesis of the pyroxene-bearing S-and I-type granitoids from the Hidaka Metamorphic Belt, Hokkaido, northern Japan2004
Author(s)
Shimura, T., Owada, Ni., Osanai, Y., Komatsu, M., Kagami, H.
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Journal Title
Trans.R.Soc.Edinburgh Earth Sci. 95
Pages: 161-179
Description
「研究成果報告書概要(和文)」より
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[Journal Article] 2004,Variety and genesis of the pyroxene-bearing S-and I-type granitoids from the Hidaka Metamorphic Belt, Hokkaido, northern Japan2004
Author(s)
Shimura, T., Owada, M., Osanai, Y., Komatsu, M., Kagami, H.
-
Journal Title
Trans.R.Soc.Edinburgh Earth Sci. 95
Pages: 161-179
Description
「研究成果報告書概要(欧文)」より
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