Lanthanium, samarium and ytterbium abundances in some southern African garnet lherzolites

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La, Sm and Yb abundances are given for coexisting garnet and clinopyroxene from four granular garnet lherzolites and a garnet pyroxenite. La/Yb ratios of clinopyroxene range from 29 to 398, and are an important factor to be considered in any partial-melting model involving garnet lherzolite. Garnets have REE distributions which conflict with the hypothesis that garnets from granular and sheared lherzolites have different REE distributions. Calculated garnet-liquid distribution coefficients for Sm and Yb average 0.09 and 6.30 respectively. Calculated REE abundances in whole rocks are less than actually found implying that xenoliths are contaminated by light-REE-rich kimberlite. Revised mantle abundances are for La, 0.7 ppm and Yb, 0.2 ppm (La/Yb = 3.5).

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