Mineralogy of volcaniclastic sands from the Izu-Bonin Arc
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1992
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| _version_ | 1867170461017702400 |
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| author | Marsaglia, Kathleen M |
| author_facet | Marsaglia, Kathleen M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Modal compositions of volcaniclastic sands recovered on Leg 126 of the Ocean Drilling Project (Izu-Bonin island arc and Sumisu Rift) are similar to those from other intraoceanic island arcs and associated marginal basins. These sands are dominantly composed of volcanic-lithic and plagioclase-feldspar grains derived from the Izu-Bonin magmatic arc and intrarift volcanoes. The glass color of volcanic fragments ranges from black (tachylite) to brown to colorless; individual samples usually contain a mixture of glass colors. Two of the forearc sites (792 and 793) are more heterogeneous with respect to glass color than the backarc/Sumisu Rift sites (788, 790, and 791). Site 787 forearc sands are dominantly composed of tachylite grains; their unique composition may be attributed either to winnowing by submarine-canyon currents or to a volcanic island source. There is an increase in the proportions of pumice/colorless glass, felsitic grains, and quartz within sediments of the incipient backarc basin (Sumisu Rift), as compared with the forearc-basin sites. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_771797 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Mineralogy of volcaniclastic sands from the Izu-Bonin Arc Marsaglia, Kathleen M 126-787A; 126-787B; 126-788A; 126-788C; 126-790A; 126-790B; 126-790C; 126-791A; 126-791B; 126-792A; 126-792B; 126-792E; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Philippine Sea Modal compositions of volcaniclastic sands recovered on Leg 126 of the Ocean Drilling Project (Izu-Bonin island arc and Sumisu Rift) are similar to those from other intraoceanic island arcs and associated marginal basins. These sands are dominantly composed of volcanic-lithic and plagioclase-feldspar grains derived from the Izu-Bonin magmatic arc and intrarift volcanoes. The glass color of volcanic fragments ranges from black (tachylite) to brown to colorless; individual samples usually contain a mixture of glass colors. Two of the forearc sites (792 and 793) are more heterogeneous with respect to glass color than the backarc/Sumisu Rift sites (788, 790, and 791). Site 787 forearc sands are dominantly composed of tachylite grains; their unique composition may be attributed either to winnowing by submarine-canyon currents or to a volcanic island source. There is an increase in the proportions of pumice/colorless glass, felsitic grains, and quartz within sediments of the incipient backarc basin (Sumisu Rift), as compared with the forearc-basin sites. |
| title | Mineralogy of volcaniclastic sands from the Izu-Bonin Arc |
| topic | 126-787A; 126-787B; 126-788A; 126-788C; 126-790A; 126-790B; 126-790C; 126-791A; 126-791B; 126-792A; 126-792B; 126-792E; 126-793A; DRILL; Drilling/drill rig; Joides Resolution; Leg126; North Pacific Ocean; Ocean Drilling Program; ODP; Philippine Sea |
| url | https://doi.org/10.1594/PANGAEA.771797 |