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Overprint of secondary Du folding in the Sambagawa metamorphic belt, SW Japan : implications for strain ellipsoids and Paleogene tectonics of the east-Eurasian margin
https://tokushima-u.repo.nii.ac.jp/records/2010346
https://tokushima-u.repo.nii.ac.jp/records/2010346caf8f7ee-d19a-4e1b-82c5-4ff64b4bf449
| 名前 / ファイル | ライセンス | アクション |
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iar_31_1_e12463.pdf (28 MB)
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| Item type | 文献 / Documents(1) | |||||||||||
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| 公開日 | 2022-10-11 | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | open access | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | journal article | |||||||||||
| 出版社版DOI | ||||||||||||
| 識別子タイプ | DOI | |||||||||||
| 関連識別子 | https://doi.org/10.1111/iar.12463 | |||||||||||
| 言語 | ja | |||||||||||
| 関連名称 | 10.1111/iar.12463 | |||||||||||
| 出版タイプ | ||||||||||||
| 出版タイプ | AM | |||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||||||||
| タイトル | ||||||||||||
| タイトル | Overprint of secondary Du folding in the Sambagawa metamorphic belt, SW Japan : implications for strain ellipsoids and Paleogene tectonics of the east-Eurasian margin | |||||||||||
| 言語 | en | |||||||||||
| 著者 |
青矢, 睦月
× 青矢, 睦月
WEKO
600
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Two contrasting results of strain analyses, constriction and flattening, are recognized in the Sambagawa high-pressure/temperature metamorphic belt, SW Japan. An unverified proposal to account for this situation is that the constrictional strain ellipsoids develop only in areas where there is strong overprinting by a secondary Du-phase folding after a penetrative Ds-phase deformation. Field studies in the Hibihara district, central Shikoku, which is located between a southern constructional region and a northern flattening region, reveal there is a map-scale contrast in the effect of Du: outcrop-scale Du upright folds are common in the southern region while they are rare in the northern region. Field measurements show that overall orientation of Ds strain is characterized by E–W stretching and vertical shortening, while that of Du strain is characterized by N–S shortening and vertical extension. The shortening caused by Du in the southern high-Du-strain regions estimated by the fold-curve tracing method are down to about 70-56 % and by removing this Du shortening most of the constrictional strain ellipsoids are restored back to the flattening field with only a few exceptions, suggesting that pre-Du strain states of the Sambagawa metamorphic rocks were dominantly of the flattening type. These results support the previous ideas that invoke differences in the strength of Du overprinting for the two different types of strain ellipsoids observed in the Sambagawa belt. From a tectonic point of view, the semi-penetrative occurrence of Du folds throughout the Sambagawa belt, which stretches about 800 km in SW Japan, suggests that the Du phase can be related to some ancient plate movement. The significant shortening subnormal to the orogen that characterizes Du may reflect a shift to orogen-subnormal subduction of the Pacific plate beneath the Eurasian plate at around 60 Ma. | |||||||||||
| 言語 | en | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | constriction | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | deformation phase | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | Du folding | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | flattening | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | overprint | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | plane strain | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | Sambagawa metamorphic belt | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | strain ellipsoid | |||||||||||
| 書誌情報 |
en : Island Arc 巻 31, 号 1, p. e12463, 発行日 2022-09-13 |
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| 収録物ID | ||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||
| 収録物識別子 | 14401738 | |||||||||||
| 収録物ID | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AA10848628 | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | Geological Society of Japan | |||||||||||
| 言語 | en | |||||||||||
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| 出版者 | Wiley | |||||||||||
| 言語 | en | |||||||||||
| 権利情報 | ||||||||||||
| 言語 | en | |||||||||||
| 権利情報 | This is the peer reviewed version of the following article: Aoya, M. (2022), Overprint of secondary Du folding in the Sambagawa metamorphic belt, SW Japan: implications for strain ellipsoids and Paleogene tectonics of the east-Eurasian margin. Island Arc, 31(1), e12463., which has been published in final form at https://doi.org/10.1111/iar.12463. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. | |||||||||||
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| 識別子 | 392187 | |||||||||||
| 識別子タイプ | URI | |||||||||||
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| 言語 | eng | |||||||||||
