High-Precision Sr-Nd-Hf-Pb-Mg-Zn Isotopies Compositions of Chinese Rock Reference Materials GSR-1, GSR-2, GSR-3 and GSR-18 Analyzed by MC-ICP-MS

In this contribution, we report Sr-Nd-Hf-Pb-Mg-Zn isotopic compositions for four Chinese rock reference materials including basalt, andesite, and granite (GBW07103-105, and GBW07727, i.e., GSR 1-3, and GSR-18, respectively). The Sr-Nd-Hf-Pb-Mg-Zn isotopic data were obtained by high-precision MC-ICP-MS in three analytical sessions over three years. The basalt and andesite reference materials (GSR-2, GSR-3 and GSR-18) have homogeneous Sr-Nd-Hf isotopic ratios with external precision better than 40 ppm (2SD). The Nd-Hf isotopic reproducibility was better than 30 ppm for the granite reference material (GSR-1), which could be used as quality control for felsic rock. For Pb isotope analyses, the external reproducibility (2RSD) ranged from 253 to 771 ppm for 206,207,208Pb/204Pb, indicating that these four Chinese rock reference materials have homogeneous Pb isotope compositions. These four Chinese rock reference materials exhibit high bottle-to-bottle homogeneity for Zn and Mg isotopes, with long-term external precision better than 0.08‰ (2SD). Therefore, these results form a comprehensive new database that can be used by the geochemical community for evaluating the Sr-Nd-Hf-Pb-Mg-Zn isotope analysis.