Uranium chemistry of oceanic basalts
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PANGAEA
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| Autores principales: | , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1979
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1867167661433028608 |
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| author | MacDougall, J Douglas Finkel, R C Carlson, J Krishnaswami, Seth |
| author_facet | MacDougall, J Douglas Finkel, R C Carlson, J Krishnaswami, Seth |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Measurements of uranium concentration and the 234U/238 U activity ratio in oceanic basalts which have undergone low-temperature seafloor alteration indicate that uranium uptake is a pervasive occurrence but that the various phases involved behave differently with respect to this process. Palagonite exhibits uranium contents 8-20 times higher than unaltered glass coupled with low 234U/238U, suggesting ongoing preferential leaching of 234U. Altered crystalline interiors of several old basalts have 234U/238U > 1, indicative of recent uranium exchange with seawater. The data also provide evidence for uranium sources with 234U/238U higher than the seawater value of 1.14. Manganese crusts on basalts of a variety of ages have isotopic ratios indicating that they either are recent deposits or also have experienced continuing uranium exchange with seawater. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_714969 |
| institution | PANGAEA |
| language | en |
| publishDate | 1979 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Uranium chemistry of oceanic basalts MacDougall, J Douglas Finkel, R C Carlson, J Krishnaswami, Seth 22-213; 24-238; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Leg22; Leg24 Measurements of uranium concentration and the 234U/238 U activity ratio in oceanic basalts which have undergone low-temperature seafloor alteration indicate that uranium uptake is a pervasive occurrence but that the various phases involved behave differently with respect to this process. Palagonite exhibits uranium contents 8-20 times higher than unaltered glass coupled with low 234U/238U, suggesting ongoing preferential leaching of 234U. Altered crystalline interiors of several old basalts have 234U/238U > 1, indicative of recent uranium exchange with seawater. The data also provide evidence for uranium sources with 234U/238U higher than the seawater value of 1.14. Manganese crusts on basalts of a variety of ages have isotopic ratios indicating that they either are recent deposits or also have experienced continuing uranium exchange with seawater. |
| title | Uranium chemistry of oceanic basalts |
| topic | 22-213; 24-238; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Leg22; Leg24 |
| url | https://doi.org/10.1594/PANGAEA.714969 |