Geochemistry of glasses from ODP Site 125-786
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PANGAEA
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| Autores principales: | , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1992
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| _version_ | 1867169503591268352 |
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| author | Newman, Sally van der Laan, Sieger R |
| author_facet | Newman, Sally van der Laan, Sieger R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Eleven glasses recovered from Holes 786A and 786B were fresh enough for volatile analysis by infrared spectroscopy. The compositions of these glasses range from boninitic to rhyolitic. The glasses from the boninites contain 1.4 to 1.7 wt% H2O, while the rhyolitic glasses contain 2 to 6 wt% H2O, and all glasses have less than 30 to 40 ppm CO2. The highest H2O contents are probably the result of seawater alteration. The unaltered dacitic to rhyolitic glasses were probably quenched at low pressures corresponding to depths of 0-700 m below the seafloor, also corresponding to the depths of collection of these samples, although the water depths may have been different between the Eocene and the present. The lower boninitic H2O contents in vesicular glasses suggest shallow quenching on the seafloor. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_763129 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of glasses from ODP Site 125-786 Newman, Sally van der Laan, Sieger R 125-786A; 125-786B; DRILL; Drilling/drill rig; Joides Resolution; Leg125; North Pacific Ocean; Ocean Drilling Program; ODP Eleven glasses recovered from Holes 786A and 786B were fresh enough for volatile analysis by infrared spectroscopy. The compositions of these glasses range from boninitic to rhyolitic. The glasses from the boninites contain 1.4 to 1.7 wt% H2O, while the rhyolitic glasses contain 2 to 6 wt% H2O, and all glasses have less than 30 to 40 ppm CO2. The highest H2O contents are probably the result of seawater alteration. The unaltered dacitic to rhyolitic glasses were probably quenched at low pressures corresponding to depths of 0-700 m below the seafloor, also corresponding to the depths of collection of these samples, although the water depths may have been different between the Eocene and the present. The lower boninitic H2O contents in vesicular glasses suggest shallow quenching on the seafloor. |
| title | Geochemistry of glasses from ODP Site 125-786 |
| topic | 125-786A; 125-786B; DRILL; Drilling/drill rig; Joides Resolution; Leg125; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.763129 |