Neodymium and Strontium Isotope Data for USGS Reference Materials BCR‐1, BCR‐2, BHVO‐1, BHVO‐2, AGV‐1, AGV‐2, GSP‐1, GSP‐2 and Eight MPI‐DING Reference Glasses

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Abstract
We have measured 87Sr/86Sr and 143 Nd/144 Nd isotope ratios in different batches and aliquots of the new US Geological Survey (USGS) reference materials (RMs) BCR‐2, BHVO‐2, AGV‐2 and GSP‐2 and the original USGS RMs BCR‐1, BHVO‐1, AGV‐1 and GSP‐1 by thermal ionisation mass spectrometry. In addition, we also analysed the eight Max‐Planck‐Institut‐Dingwell (MPI‐DING) reference glasses. Nearly all isotope ratios obtained in the different aliquots and batches agree within uncertainty limits indicating excellent homogeneity of the USGS powders and the MPI‐DING glasses. With the exception of GSP‐2, the new USGS RMs are also indistinguishable from the ratios found in the original USGS RMs (87Sr/86Sr: 0.704960, 0.704958 (BCR‐1, ‐2), 0.703436, 0.703435 (BHVO‐1, ‐2), 0.703931, 0.703931 (AGV‐1, ‐2); 143 Nd/144 Nd: 0.512629, 0.512633 (BCR‐1, ‐2), 0.512957, 0.512957 (BHVO‐1, ‐2); 0.512758, 0.512755 (AGV‐1, ‐2)). This means that for normalisation purposes in Sr and Nd isotope geochemistry BCR‐2, BHVO‐2 and AGV‐2 can well replace BCR‐1, BHVO‐1 and AGV‐1 respectively.