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| Auteurs principaux: | , |
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| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
1980
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| Accès en ligne: | https://doi.org/10.1594/PANGAEA.714972 |
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| _version_ | 1867167661439320064 |
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| author | Desprairies, Alain Bonnot-Courtois, Chantal |
| author_facet | Desprairies, Alain Bonnot-Courtois, Chantal |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In basalts and volcanogenic sediments from the Indian Ocean, the successive stages of submarine alteration of volcanic rocks and glasses give rise to the incorporation or the relative increase of iron in smectite lattices. During the first stage, the Mg-smectites are the most abundant; they are occasionally associated with Al-smectites. Afterwards, they are gradually replaced by iron-rich smectites. The REE distribution follows the same trend as the mineralogical changes. During the f'trst stage of alteration, REE distribution in clay minerals is the same as in the fresh glasses but, when the iron-rich smectites increase, the Ce has a specific behaviour. The Ce shows a positive anomaly in iron-rich smectites formed early in palagonitized glasses, and a negative one in authigenic smectites formed later from solutions in equilibrium with seawater. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_714972 |
| institution | PANGAEA |
| language | en |
| publishDate | 1980 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of altered smectites Desprairies, Alain Bonnot-Courtois, Chantal 26-253; Deep Sea Drilling Project; Dredge; DRG; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//RIDGE; Leg26; RC14; RC14-6D; Robert Conrad In basalts and volcanogenic sediments from the Indian Ocean, the successive stages of submarine alteration of volcanic rocks and glasses give rise to the incorporation or the relative increase of iron in smectite lattices. During the first stage, the Mg-smectites are the most abundant; they are occasionally associated with Al-smectites. Afterwards, they are gradually replaced by iron-rich smectites. The REE distribution follows the same trend as the mineralogical changes. During the f'trst stage of alteration, REE distribution in clay minerals is the same as in the fresh glasses but, when the iron-rich smectites increase, the Ce has a specific behaviour. The Ce shows a positive anomaly in iron-rich smectites formed early in palagonitized glasses, and a negative one in authigenic smectites formed later from solutions in equilibrium with seawater. |
| title | Geochemistry of altered smectites |
| topic | 26-253; Deep Sea Drilling Project; Dredge; DRG; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//RIDGE; Leg26; RC14; RC14-6D; Robert Conrad |
| url | https://doi.org/10.1594/PANGAEA.714972 |