Abstract
To meet the rapid development of zircon U-Pb geochronology and Hf-O isotope geochemistry, it is imperative to develop well-characterized zircon reference materials for microbeam analysis. Here, zircon KV01 separated from the Kaap Valley pluton, South Africa is introduced as a potential Archean reference material for microbeam U-Pb age and Hf-O isotope determination. SIMS and LA-ICP-MS U-Pb isotopic measurements gave grand mean 207Pb/206Pb ages of 3233±16 Ma (2s, n=90) and 3230±26 Ma (2s, n=52), which are consistent with reported CA-ID-TIMS results. Slight heterogeneity of oxygen isotopes is revealed by SIMS analyses that yielded a relatively large δ18O range of 4.61–6.51‰. Among them, the zircon grains with clear oscillatory zones give a grand mean δ18O value of 6.17±0.33‰ (2s), which is suggested to record the primary O isotopic compositions. The homogeneity in the Hf isotopic compositions of KV01 zircon was checked by the laser ablation and solution MC-ICP-MS methods. They yielded consistent results with a recommended 176Hf/177Hf ratio of 0.280810±0.000013 (2s). The results reported here demonstrate that KV01 zircon could be a reliable reference material for microbeam 207Pb/206Pb age and Hf isotope determinations of ancient zircons, and be suitable as a quality monitor for SIMS oxygen isotopic analysis.
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Acknowledgements
We appreciate the assistance of Qiuli LI, **aoxiao LING, Yu LIU, Guoqiang TANG, Jiao LI and Hongxia MA in making SIMS U-Pb age and O isotope determinations. The two anonymous reviewers are greatly acknowledged and appreciated for their excellent and constructive comments. This work was supported by the National Key R & D Program of China (Grant No. 2016YFC0600109), the B-type Strategic Priority Program of the Chinese Academy of Sciences (Grant No. XDB41000000), the National Natural Science Foundation of China (Grant Nos. 41973035 & 41688103), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2020068), and the State Key Laboratory of Lithospheric Evolution (Grant No. SKL-Z201901-YT).
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Wei, Q., Wang, H., Yang, Y. et al. KV01 zircon—A potential New Archean reference material for microbeam U-Pb age and Hf-O isotope determinations. Sci. China Earth Sci. 63, 1780–1790 (2020). https://doi.org/10.1007/s11430-019-9638-y
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DOI: https://doi.org/10.1007/s11430-019-9638-y