WJS810 : A Low‐Radiation‐Damage Neoproterozoic (~ 817 Ma) Zircon Reference Material for Microbeam U‐Pb, Hf and O Isotopic Measurement

This study introduces WJS810, a new natural zircon reference material designed for microbeam‐based U‐Pb geochronology and Hf‐O isotope geochemistry. Extensive analyses using secondary ion mass spectrometry (SIMS) and laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) have confirmed that WJS810 exhibits uniform U‐Pb, Hf and O isotopic ratios. Six chemical abrasion isotope dilution thermal ionisation mass spectrometry (CA‐ID‐TIMS) U‐Pb isotopic measurements yielded weighted mean 206 Pb/ 238 U, 207 Pb/ 235 U and 207 Pb/ 206 Pb ages of 816.88 ± 0.61 Ma (2 s , n = 6), 816.90 ± 0.59 Ma (2 s , n = 6) and 816.79 ± 0.93 Ma (2 s , n = 6), respectively. Results from SIMS and LA‐ICP‐MS yielded concordant ages are in agreement with the TIMS age within analytical uncertainty. The mean 176 Hf/ 177 Hf ratio determined by LA‐MC‐ICP‐MS is 0.282548 ± 0.000043 (2 s , n = 121), which is in good consistency with the mean of 0.282548 ± 0.000005 (2 s , n = 6) determined by solution‐MC‐ICP‐MS. The δ 18 O value determined by SIMS is 6.65 ± 0.36‰ (2 s , n = 117), which is consistent with the mean of 6.46 ± 0.21‰ (2 s , n = 8) determined by laser fluorination. Raman microspectroscopy demonstrates that WJS810 exhibits exceptionally low (minimal) radiation damage, with a mean full width at half maximum (FWHM) of 4.06 cm ‐1 , comparable to the widely used 91500 reference material (mean FWHM = 4.47 cm ‐1 ). WJS810 represents a valuable addition to the existing suite of Neoproterozoic zircon reference materials for microbeam‐based U‐Pb geochronology and Hf‐O isotope measurement.