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

We have measured 87 Sr/ 86 Sr and 14 3 Nd/ 14 4 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 ( 87 Sr/ 86 Sr: 0.704960, 0.704958 (BCR‐1, ‐2), 0.703436, 0.703435 (BHVO‐1, ‐2), 0.703931, 0.703931 (AGV‐1, ‐2); 14 3 Nd/ 14 4 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.