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Structural variations of arc crusts and rifted margins in the southern Izu-Ogasawara arc-back arc system
https://nied-repo.bosai.go.jp/records/4511
https://nied-repo.bosai.go.jp/records/45112bc234d9-30ee-4a41-afb3-36a2dd5fa4ad
| Item type | researchmap(1) | |||||||||||||||||||||||||
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| 公開日 | 2023-03-30 | |||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||
| タイトル | Structural variations of arc crusts and rifted margins in the southern Izu-Ogasawara arc-back arc system | |||||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||||
| 著者 |
Narumi Takahashi
× Narumi Takahashi
× Shuichi Kodaira
× Yoshiyuki Tatsumi
× Mikiya Yamashita
× Takeshi Sato
× Yuka Kaiho
× Seiichi Miura
× Tetsuo No
× Kaoru Takizawa
× Yoshiyuki Kaneda
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| 抄録 | ||||||||||||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||||||||||||
| 内容記述 | We carried out a reflection/refraction seismic survey across the southern Izu-Ogasawara arc-back arc system, covering three arcs with different crustal ages. The oldest Eocene arc has middle and lower crust with high velocities of 6.4-6.6 and 6.8-7.4 km/s, respectively, suggesting denser crustal materials. The current volcanic arc has middle and lower crust with lower velocities of 5.7-6.5 and 6.7-7.1 km/s, suggesting advanced crustal differentiation. The crust-mantle transition layer, with a velocity of 7.5-8.0 km/s, is distributed beneath the current volcanic arc and the rear arc, suggesting a pool of dense materials emanating from the crust through the crustal growth. These structural differences between the Eocene arc and current arc indicate a difference of crustal growth based on basaltic and andesitic magmas according to known petrologic studies. Commonly, rifted crusts have lower crusts with high velocities of over 7.0 km/s, and the arc-back arc transition zone also has a thinner more reflective crust that may have been affected by postrifting magmatism. | |||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||
| 書誌情報 |
en : GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 巻 10, 号 Q09X08, 発行日 2009-09 |
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| 言語 | en | |||||||||||||||||||||||||
| 出版者 | AMER GEOPHYSICAL UNION | |||||||||||||||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||||||||||||||
| 収録物識別子 | 1525-2027 | |||||||||||||||||||||||||
| DOI | ||||||||||||||||||||||||||
| 関連識別子 | 10.1029/2008GC002146 | |||||||||||||||||||||||||
