An igneous zircon reference material (OG1) was characterised for U‐Pb isotopes by ID‐TIMS, and utilised to evaluate SIMS (SHRIMP) instrumental mass fractionation (IMF) of radiogenic Pb isotopes ( 207 Pb*/ 206 Pb*). The TIMS 207 Pb*/ 206 Pb* reference value for OG1 was 0.29907 ± 0.00011 (95% confiden...
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