Radiogenic isotopic ratios are widely used in earth sciences to estimate the ages of terrestrial and extraterrestrial rocks and characterize geological processes and environments (Faure and Mensing, 2005). The decay of rubidium (Rb) and samarium (Sm) produces the daughter isotopes strontium (Sr) and neodymium (Nd). Because parent isotopes have relatively long half-lives, radiometric Rb-Sr and Sm-Nd dating techniques are often utilized for silicate rock analyses. Previous researchers have convincingly established the capability of these radiogenic isotopes in terrestrial rocks to interpret continental crust history, the significance of crustal and mantle interactions, and supercontinent and orogenic cycles (Chapman and Ducea, 2019, Chauvel et al., 2008, Dhuime et al., 2015, Hawkesworth et al., 2017, Gao et al., 2004, and Spencer et al., 2018).

Thermal ionization mass spectrometry (TIMS) can provide highly accurate Sr and Nd isotope measurements for geological and environmental samples. In this study, we conducted a sequential separation of Sr and Nd and subsequently measured the 87Sr/86Sr, and 143Nd/144Nd, ratios of 8 widely used rock-certified reference materials (CRMs), namely BCR-1, BHVO-2, JA-3, JB-3, JG-1a, JG-3, JGb-1, and STM1, using TIMS. Though the Sr–Nd isotopic compositions of most in-house CRMs were indistinguishable from previously reported values, the data produced here is more precise than the reported values. Hence, these rock reference materials can be used to monitor the sample accuracy and assess the quality of Sr–Nd isotope analyses. Also, we report the first isotopic ratios of Sr, Nd, in STM-1. Al