A study related to the light-lanthanide tetrad effect in northeastern Atlantic (28 degrees N 26 degrees W) in comparison with other oceans

Based on the data published by Elderfield and Greaves (1982) for a water co lumn at a site, GEOSECS station 115, of northeastern Atlantic (28 degrees N 26 degrees W), the light-lanthanide tetrad effect was evaluated by the met hod developed by Masuda and his collaborators. The extent of variation of t his effect is much larger than those observed in Pacific and Indian Oceans. Meanwhile, it intrigues us that the value for the effect in question at th e top of the water column is almost the same as that at its bottom. Similar facts are observed generally at water columns of other oceans studied thus far. Features of dependence of Nd concentration on depth and of dependence of Ce and Eu anomalies evaluated on the basis of the same mathematical met hod are also discussed. A minimum absolute value of negative aberration ext remum defining the tetrad effect at station 115 can be ascribed to the outf low from the Mediterranean Sea.