M.P. Bacon 1978 <div id="abstracts" class="Abstracts u-font-serif text-s"><div id="ab1" class="abstract author" lang="en"><div id="aep-abstract-sec-id3"><p>A young (&lt;1 m.y.) tholeiitic basalt dredged from the Mid-Atlantic Ridge displays a²³⁴U excess and a²³⁰Th deficiency that have resulted from the addition of seawater uranium during weathering at seafloor temperatures. Two older samples, though they acquired substantial amounts of uranium from seawater, are depleted in²³⁴U, indicating preferential leaching of this isotope. Hydrothermally altered samples suggest that some uranium loss may have occurred. Possible isotopic effects of preferential²³⁴U leaching, however, are obscured by secondary addition of seawater uranium at lower temperatures.</p></div></div></div><ul id="issue-navigation" class="issue-navigation u-margin-s-bottom u-bg-grey1"></ul> application/pdf 10.1016/0012-821X(78)90200-5 en Elsevier Radioactive disequilibrium in altered mid-oceanic basalts article