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Radioactive disequilibrium in altered mid-oceanic basalts

Earth and Planetary Science Letters

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Abstract

A young (<1 m.y.) tholeiitic basalt dredged from the Mid-Atlantic Ridge displays a 234U excess and a 230Th 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 in 234U, indicating preferential leaching of this isotope. Hydrothermally altered samples suggest that some uranium loss may have occurred. Possible isotopic effects of preferential 234U leaching, however, are obscured by secondary addition of seawater uranium at lower temperatures. ?? 1978.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Radioactive disequilibrium in altered mid-oceanic basalts
Series title:
Earth and Planetary Science Letters
Volume
39
Issue:
2
Year Published:
1978
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
250
Last page:
254