Chemistry of Pliocene-Pleistocene pumice from the Izu-Bonin Arc
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| Auteurs principaux: | , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1992
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| _version_ | 1867167666499747840 |
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| author | Nishimura, Akira Rodolfo, Kelvin S Koizumi, Akiko Gill, James B Fujioka, Kantaro |
| author_facet | Nishimura, Akira Rodolfo, Kelvin S Koizumi, Akiko Gill, James B Fujioka, Kantaro |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Thick pumice deposits were found in the cored sequences of forearc, arc, and backarc sites of Leg 126 in the Izu-Bonin Arc. These deposits, composed of fragmental rhyolite pumice with the chemical composition of low-alkali tholeiites, are products of arc volcanism. Pumice deposits constitute more than half of the thickness of the sediment fill of the Sumisu Rift, a backarc rift of the Izu-Bonin Arc. They comprise five thick pumiceous beds separated by thin hemipelagic units; as such, they record four major episodes or pulses of explosive, rhyolitic volcanism during the last 0.15 Ma, separated by quiescent intervals that each lasted about 30-60 k.y. The thick pumiceous beds were deposited in the rift mainly by sediment gravity flows during and immediately after the eruption of arc volcanos, which were probably submarine. Initiation of rifting was also preceded in the Pliocene by submarine rhyolitic volcanism, as seen in samples from the top of the eastern rift flank. Thick pumice beds correlative with those in the backarc also occur in the forearc basin to the east. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_771335 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Chemistry of Pliocene-Pleistocene pumice from the Izu-Bonin Arc Nishimura, Akira Rodolfo, Kelvin S Koizumi, Akiko Gill, James B Fujioka, Kantaro 125-785A; 126-788C; 126-790B; 126-790C; 126-791A; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg125; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Philippine Sea Thick pumice deposits were found in the cored sequences of forearc, arc, and backarc sites of Leg 126 in the Izu-Bonin Arc. These deposits, composed of fragmental rhyolite pumice with the chemical composition of low-alkali tholeiites, are products of arc volcanism. Pumice deposits constitute more than half of the thickness of the sediment fill of the Sumisu Rift, a backarc rift of the Izu-Bonin Arc. They comprise five thick pumiceous beds separated by thin hemipelagic units; as such, they record four major episodes or pulses of explosive, rhyolitic volcanism during the last 0.15 Ma, separated by quiescent intervals that each lasted about 30-60 k.y. The thick pumiceous beds were deposited in the rift mainly by sediment gravity flows during and immediately after the eruption of arc volcanos, which were probably submarine. Initiation of rifting was also preceded in the Pliocene by submarine rhyolitic volcanism, as seen in samples from the top of the eastern rift flank. Thick pumice beds correlative with those in the backarc also occur in the forearc basin to the east. |
| title | Chemistry of Pliocene-Pleistocene pumice from the Izu-Bonin Arc |
| topic | 125-785A; 126-788C; 126-790B; 126-790C; 126-791A; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg125; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Philippine Sea |
| url | https://doi.org/10.1594/PANGAEA.771335 |