Computer Science – Sound
Scientific paper
Apr 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..259s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 4, pp.259-313
Computer Science
Sound
14
Scientific paper
Methods for the determination of 18 trace elements in sea water by neutron activation analysis have been developed. Of these elements sufficient analyses have been completed for gold, selenium, antimony, silver, cobalt and nickel to permit a discussion of their distributions in the world ocean. The distributions of gold, selenium and antimony are more uniform than those of silver, cobalt and nickel, so little can be said regarding the processes important to their supply to and removal from the world ocean. The variations observed for silver, cobalt and nickel, however, make possible the evaluation of several factors which influence their concentrations in the ocean: The Atlantic Ocean north of 10°S receives 60 per cent of the total dissolved material supplied to the ocean by streams, but is lower in silver, cobalt and nickel than is the remainder of the world ocean indicating that continental run-off is not important in the deep-sea economy of these elements. Relatively high concentrations of cobalt and nickel are found in water of the central Pacific Ocean in areas where the cobalt/manganese and nickel/manganese ratios in manganese nodules are high. The evidence that the nodule material in these areas is of volcanic origin may also imply a volcanic origin for the cobalt and nickel in the overlying water. No such source is indicated for silver. Unweathered rock material supplied directly to the ocean by Antarctic glaciers seems to be sufficient to affect the silica economy of the ocean and may in part affect the economy of other trace elements such as cobalt and nickel. The data are not sufficient, however, to permit an unambiguous interpretation. Cobalt and nickel are relatively low in Long Island Sound compared to the North Atlantic indicating near-shore removal of these elements from sea water. In the deep sea much of the cobalt and nickel may be removed by co-precipitation with manganese oxide, but no mechanism seems singularly important in the removal of silver. Increase in concentration of silver, cobalt and nickel with depth in areas of high organic productivity indicates alteration of trace element concentration by organic reactions. In areas where upwelling currents oppose the downward movement of organic material a relatively high steady state concentration may be produced.
Schutz Donald F.
Turekian Karl K.
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