Petrology and geochemistry of the Izu-Bonin Forearc tephras
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| Autori principali: | , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1992
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| _version_ | 1867168558588362752 |
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| author | Fujioka, Kantaro Matsuo, Yoshiko Nishimura, Akira Koyama, Masato Rodolfo, Kelvin S |
| author_facet | Fujioka, Kantaro Matsuo, Yoshiko Nishimura, Akira Koyama, Masato Rodolfo, Kelvin S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Numerous marine tephra layers cored at Sites 792 and 793 in the Izu-Bonin forearc region offer additional information about the timing and spatial characteristics of arc volcanism and the evolution of island arcs. Explosive volcanism along the Izu-Bonin Arc, with maxima just before rifting of the arc at ~40 and 5-0 Ma, produced black and white tephras of variable grain sizes and chemical compositions. Most of the tephras belong chemically to low-K and low-alkali tholeiitic rock series with a few tephra of the high-K and alkalic rock series. Most of the tephras (low-K series) were derived from the Izu-Bonin Arc, although a few were produced far to the west of the Izu-Bonin Arc (e.g., from the Ryukyu Arc). Black tephras may have come from nearby sources, such as Aogashima, Sumisu, and Torishima islands. The high-K series of tephras, within the sediments younger than 3 Ma, may reflect thickening of the island-arc crust. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_770523 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Petrology and geochemistry of the Izu-Bonin Forearc tephras Fujioka, Kantaro Matsuo, Yoshiko Nishimura, Akira Koyama, Masato Rodolfo, Kelvin S 126-792A; 126-792B; 126-792C; 126-792D; 126-792E; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP Numerous marine tephra layers cored at Sites 792 and 793 in the Izu-Bonin forearc region offer additional information about the timing and spatial characteristics of arc volcanism and the evolution of island arcs. Explosive volcanism along the Izu-Bonin Arc, with maxima just before rifting of the arc at ~40 and 5-0 Ma, produced black and white tephras of variable grain sizes and chemical compositions. Most of the tephras belong chemically to low-K and low-alkali tholeiitic rock series with a few tephra of the high-K and alkalic rock series. Most of the tephras (low-K series) were derived from the Izu-Bonin Arc, although a few were produced far to the west of the Izu-Bonin Arc (e.g., from the Ryukyu Arc). Black tephras may have come from nearby sources, such as Aogashima, Sumisu, and Torishima islands. The high-K series of tephras, within the sediments younger than 3 Ma, may reflect thickening of the island-arc crust. |
| title | Petrology and geochemistry of the Izu-Bonin Forearc tephras |
| topic | 126-792A; 126-792B; 126-792C; 126-792D; 126-792E; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.770523 |