2002 Fiscal Year Final Research Report Summary
Accretion and uplifting of deep accretionary complex
| Project/Area Number |
12640446
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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 | Ehime University |
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Principal Investigator |
SAKAKIBARA Masayuki Ehime University, Sciences, Associated Professor, 理学部, 助教授 (80202084)
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| Project Period (FY) |
2000 – 2002
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| Keywords | deep accretionary complex / Sanbagawa belt in central and western Shikoku / oceanic plate stratigraphy / sequence of protolith / recumbent fold / nappe structure / fluid-rock interaction / shuffled card structure |
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| Research Abstract |
In this research project, we have succeeded in accretion and uplifiting of deepest part of accretionary complex. The results are as follows.
(1) Protolith of the high-P/T Sanbagawa metamorphic rocks can be divided into 22 rock types in the central and western Shikoku, Japan.
(2) On the basis of a sequence of protohlith, the oceanic plate stratigraphy can be distinguished in the Sanbagawa metamorphic rocks in the central and western Shikoku.
(3) The Giant recumbent fold of the Sanbagawa metamorphic belt in the central Shikoku by Banno et al.(1978) can be confirmed based on the reconstructed oceanic plate stratigraphy.
(4) The Sanbagawa metamorphic rocks are characterized by "Shuffled card structure" showing injection of pelitic schists into the sequences originated from the oceanic plate stratigraphy.
(5) In the Sanbagawa metamorpphic rocks as a deepest part of accretionary complex, fluid released by dehydration pass through nappe boundaries and regionally gives addition of Boron and oxygen isotopic alterations.
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Research Products
(4 results)
