MacDougall, J Douglas; Finkel, R C; Carlson, J; Krishnaswami, Seth (1979): Uranium chemistry of oceanic basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.714969, Supplement to: MacDougall, JD et al. (1979): Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt. Earth and Planetary Science Letters, 42(1), 27-34, https://doi.org/10.1016/0012-821X(79)90187-0
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Abstract:
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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
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
Event(s):
22-213 * Latitude: -10.211800 * Longitude: 93.896200 * Date/Time: 1972-02-04T00:00:00 * Elevation: -5601.0 m * Penetration: 163 m * Recovery: 143.6 m * Location: Indian Ocean//BASIN * Campaign: Leg22 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 163 m cored; 0 m drilled; 88.1 % recovery
24-238 * Latitude: -11.153500 * Longitude: 70.526000 * Date/Time: 1972-06-16T00:00:00 * Elevation: -2832.0 m * Penetration: 586.5 m * Recovery: 424 m * Location: Indian Ocean//FRACTURE ZONE * Campaign: Leg24 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 63 cores; 577 m cored; 9.5 m drilled; 73.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- MacDougall, JD; Finkel, RC; Carlson, J et al. (1979): (Table 1) Uranium chemistry of oceanic basalt whole rock samples. https://doi.org/10.1594/PANGAEA.714967
- MacDougall, JD; Finkel, RC; Carlson, J et al. (1979): (Table 2) Separated phases from Mid-Indian Ocean Ridge samples. https://doi.org/10.1594/PANGAEA.714968