| 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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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Uetsu area / granite / metamorphism / UHT / granulite / Cretaceous / Ryoke Belt / lower crust / 西南日本 / 棚倉構造線 / ゼノリス / 部分融解 / 西南日本弧 / 同位体岩石学 / 変成岩 / スピネル+石英 |
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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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