ABSTRACT

We have measured ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd ratios for the GSJ rock reference samples JB-1a, JA-1 and JG-1a. The results are as follows; ⁸⁷Sr/⁸⁶Sr ratio, JB-1a, 0.704083±0.000016 (2σ, Number of runs is nine), JA-1, 0.703507±0.000016 (N=2), JG-1a, 0.710973±0.000014 (N=3); ¹⁴³Nd/¹⁴⁴Nd ratio, JB-1a, 0.512784±0.000011 (N=1), JA-1, 0.513065±0.000010 (N=1), JG-1a, 0.512377±0.000019 (N=1). According to the compilation by Ando and Shibata (1988), reported data for these reference samples do not concentrate within restricted ranges, and some of them are considerably different from our results. The inter-laboratory difference is partly due to the difference in type of mass spectrometer, but experimental procedures including chemical preparation should also be responsible.