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Asthenospheric injection and back-arc opening: Isotopic evidence from Northeast Japan
http://hdl.handle.net/10126/4519
http://hdl.handle.net/10126/4519474995bc-66d1-469d-99e9-ce31aaa06f70
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
105nohda.pdf (1.2 MB)
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| Item type | 会議発表論文 / Conference Paper(1) | |||||
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| 公開日 | 2010-05-12 | |||||
| タイトル | ||||||
| タイトル | Asthenospheric injection and back-arc opening: Isotopic evidence from Northeast Japan | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Asthenospheric injection | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Back-arc opening | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Isotopic composition | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Northeast Japan | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||
| 資源タイプ | conference paper | |||||
| 著者 |
Nohda, Susumu
× Nohda, Susumu× Tatsumi, Yoshiyuki× Otofuji, Yo-ichiro× Matsuda, Takaaki× Ishizaka, Kyoichi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Nd and Sr isotopic compositions were determined for the Tertiary volcanics from the back-arc side of the NE Japan arc. Sr isotopes show a linear trend through time from an enriched signature (^<87>Sr/ ^<86>Sr = 0.705437) to a depleted signature (^<87>Sr/ ^<86>Sr = 0.70270). In a complementary fashion, Nd isotopes start at low value ( ∈_<Nd> = -0.80)and show a gradual increase ( ∈_<Nd> = 8.3) with decreasing age. Isotopic change of Nd and Sr from the enriched signature to the depleted one is synchronous with the opening of the Japan sea at ～15 Ma. This synchronism indicates that the opening of the Japan Sea was initiated by the injection of the asthenosphere. During the pre-opening stage, the mantle wedge was composed of a two-layered structure: the sub-continental lithosphere and the underlying asthenosphere. The volcanics of this stage characterized by an enriched isotopic signature were derived from a source with a higher proportion of sub-continental lithosphere. The sub-continintal lithosphere of the back-arc side was thinned by the injection of the depleted asthenosphere, which accelerated the growth of the MORB source within the mantle wedge of the back-arc side and resulted in magma generation with the depleted isotopic signature of Nd and Sr at the post-opening stage. | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Japanese WESTPAC Symposium. June 6-7, 1989. Ocean Research Institute, University of Tokyo. 西太平洋におけるマイクロプレートテクトニクスと古環境地図に関する研究会. 1989年6月6日-7日. 東京大学海洋研究所. | |||||
| 書誌情報 |
くろしお. 特別号 : 高知大学黒潮圏研究所所報 = Report of the Institute of the Kuroshio Sphere, Kochi University. Special series 巻 4, p. 105-117, 発行日 1989-12-20 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 09131302 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN1020384X | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 出版者 | ||||||
| 出版者 | 高知大学黒潮圏研究所 | |||||
| 言語 | ja | |||||
