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

Based on the data published by Elderfield and Greaves (1982) for a water column at a site, GEOSECS station 115, of northeastern Atlantic (28°N 26°W), the light-lanthanide tetrad effect was evaluated by the method developed by Masuda and his collaborators. The extent of variation of this 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 the 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 method are also discussed. A minimum absolute value of negative aberration extremum defining the tetrad effect at station 115 can be ascribed to the outflow from the Mediterranean Sea.