Some factors controlling the concentration of uranium in the world ocean |
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Authors: | Salman Bloch |
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Institution: | Oklahoma Geological Survey, University of Oklahoma, 830 Van Vleel Oval, Norman, OK 73019, U.S.A. |
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Abstract: | Low-temperature alteration of the oceanic crust is a major sink for the U supplied to the oceans and may account for about 50% of the estimated present-day input of this element. Uranium uptake by organic-rich sediments and coexisting phosphorites on continental margins is also important and may remove in excess of 10% of the total supply. High-temperature alteration of oceanic basalts, metalliferous sediments, carbonate sediments, and sediments in anoxic basins deeper than 200 m play a relatively minor role in the removal of U. Each of these sinks is responsible for the uptake of less than 5% of the overall input. |
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