Seawater iron distribution

As predicted from the nuciear size effect on the distribution of uranium isotopes, Steriing et al. (2007) and Weyer et al. (2008) report a totai variation of 1.5 %o in the 238 j/2S5 j pg jQg decreasing in the order from biack shaies > basaits, > seawater, > banded iron formations (BiFs). The biack shaies reflect preferentiai reduction by organic matter of U from seawater. 

The biological pump influences, to varying degrees, the distribution of many elements in seawater besides carbon, nitrogen, phosphorus, and silicon. Barium, cadmium, germanium, zinc, nickel, iron, selenium, yttrium, and many of the REEs show depth distributions that very closely resemble profiles of the major nutrients. Additionally, beryllium, scandium, titanium, copper, zirconium, and radium have profiles where concentrations increase with depth, although the correspondence of these profiles with nutrient profiles is not as tight (Nozaki, 1997). 

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