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Six samples from Holes 417A and 417D, near the southern end of the Bermuda Rise, and one sample (AII-92-29-1) from 23°N Mid-Atlantic Ridge were analyzed for a highly precise determination of REE, Ba, and Sr. As anticipated from theoretical considerations, employment of ordinary linear scale for vertical axis proved strikingly expedient in realizing the comparatively fine but significant characeristics of chondrite-normalized REE patterns of abyssal tholeiites or the like; the Leedey chondrite is employed for normalization. The abundances of Nd are high for rocks with steeper inclinations for heavy REE (HREE) span. When a regression line is drawn, La and Nd deviate in a negative direction and Ce in a positive direction; there is a correlation between the extents of La deviation and Ce deviation. Moreover, the sum of squares of deviations, ΔLa, ΔCe, and ΔNd, from the regression line for the La-Ce-Nd span increases with the increase of HREE inclination. These observations can be theoretically understood through quantitative study. Meanwhile, it is concluded that the Bermuda Rise rocks correspond to solid-type material system involved with separation from a melt with almost horizontal REE patterns, indicating the Fw value is close to unity. In a relative sense, AII-92-29-1 reflects the separation from melt with a smaller fw. Also, it is worth pointing out that the extensions of regression lines for the Hole 417A and 417D samples intersect the abscissa around — 3.3~ —3.4.

Determination of Rare-Earth Elements in Leg 51, Site 417 Samples