Sr and Nd isotope ratios of twelve GSJ rock reference samples

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⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd ratios for twelve GSJ rock reference samples (GSJ-RRS), together with the chemical standards NBS987, La Jolla and JNdi-1, have been measured on a MAT262 mass spectrometer in the Department of Geology, Niigata University. Measurements of five to nine aliquots for each GSJ-RRS gave small standard deviations of both Sr and Nd isotopic ratios.