QUADRUPLE PARABOLIC ABERRATION CURVES INDEPENDENTLY DERIVED FROM LANTHANIDES IN SAMPLES OF LEUCO-GRANITIC GNEISS AND SEAWATER

Four parabolic functions were derived separately for the first, the se cond, the third and the fourth tetrads of lanthanides in samples of le uco-granitic gneiss from Korea, and seawater from off the coasts of Sh imane and Kochi prefectures, Japan. We conclude that relative lanthani de abundances in each of those samples are mathematically expressed by a set of four parabolic functions. The parabolic functions are applic able to the abundance ratio values as well as the values of aberration from the cusp-spanning lines. Both parabolic function systems are sig nificant in different senses, but a set of four parabolas for ''aberra tion'' is convenient in visualizing the characteristics of lanthanide tetrad phenomenon observed for the sample. Difference in those charact eristics can be interpreted to reflect uniquely the state of lanthanid es present and/or the condition of genesis of the sample.