Uranium chemistry of oceanic basalts
| Cobertura |
MEDIAN LATITUDE: -16.438486 * MEDIAN LONGITUDE: 116.645059 * SOUTH-BOUND LATITUDE: -24.143300 * WEST-BOUND LONGITUDE: 70.235000 * NORTH-BOUND LATITUDE: 9.216700 * EAST-BOUND LONGITUDE: -105.200000 * DATE/TIME START: 1972-02-04T00:00:00 * DATE/TIME END: 1972-06-16T00:00:00 |
|---|---|
| Data(s) |
11/05/1979
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| Resumo |
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. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.714969 doi:10.1594/PANGAEA.714969 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: MacDougall, J Douglas; Finkel, RC; Carlson, J; Krishnaswami, Seth (1979): Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt. Earth and Planetary Science Letters, 42(1), 27-34, doi:10.1016/0012-821X(79)90187-0 |
| Palavras-Chave | #1 sigma counting error; 22-213; 234U/238U; 234U/238U std dev; 24-238; Age; AGE; Comment; crystalline interior; crystalline interior, 1 sigma counting error; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Event; Fission-track; Glomar Challenger; Indian Ocean//BASIN; Indian Ocean//FRACTURE ZONE; Label; Latitude; LATITUDE; Leg22; Leg24; Longitude; LONGITUDE; ODP sample designation; Radiochemical analysis after Ku, Broecker (1969); Samp com; Sample code/label; Sample comment; U; unaltered glass; unaltered glass, 1 sigma counting error; Uranium; Uranium, standard deviation; Uranium 234/Uranium 238 activity ratio; Uranium 234/Uranium 238 activity ratio, standard deviation; U std dev |
| Tipo |
Dataset |
