Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt

Details Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt Isotopic evidence for uranium exchange during low-temperature alteration of oceanic basalt

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..42...27m&link_type=abstract

Earth and Planetary Science Letters, Volume 42, Issue 1, p. 27-34.

Physics

9

Scientific paper

Measurements of uranium concentration and the 234U/238U 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.

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