Uranium in submarine metalliferous deposits

Details Uranium in submarine metalliferous deposits Uranium in submarine metalliferous deposits

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2557r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 12, pp.2557-2565

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Scientific paper

Hydrothermal submarine metalliferous deposits, common in areas of the ocean floor with high heat flow, contain generally about 10 ppm U as an order of magnitude. The U 234 / U 238 ratio is in the majority of cases close to that of seawater; only in a few cases is it anomalously high. Anomalous U 234 / U 238 ratios are coupled with low U concentrations. These data are explained by a model where thermal water (essentially heated seawater) in its sub-bottom circulation often is unable to leach U from the basaltic oceanic crust; in fact, these thermal waters may in some cases lose U. When leaching of U from the basalt does take place, probably during shallow stages of the sub-bottom circulation, the resulting anomalous U 234 / U 238 ratio can be preserved in the hydrothermal deposit only if mixing with `seawater' U is prevented.

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