The 143Nd/ 144Nd ratios were determined for twelve GSJ (Geological Survey of Japan) rock reference samples.The results are summarized in Table 1.Analytical uncertainties in 143Nd / 144Nd ratios of several separate measurements are slightly larger for granite standard samples (JG-l, JG-la) than for basalt (JB-1) and andesite (JA-1) samples.This is possibly due to incomplete sample decomposition and Nd separation, or to inhomogeneity in modal composition, hence chemical composition of the powdered samples.
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Yoji Arakawa (1992) studied this question.