KV01 zircon—A potential New Archean reference material for microbeam U-Pb age and Hf-O isotope determinations

作者：Qindi WEI,Hao WANG,Yueheng YANG,Jinhui YANG,Chao HUANG,Shitou WU,Liewen XIE

摘要：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(2 s,n=90)and 3230±26 Ma(2 s,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 largeδ18O range of 4.61–6.51‰.Among them,the zircon grains with clear oscillatory zones give a grand meanδ18O value of 6.17±0.33‰(2 s),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(2 s).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.

发文机构：State Key Laboratory of Lithospheric Evolution Innovation Academy for Earth Science University of Chinese Academy of Sciences

关键词：ZirconreferencematerialKV01U-PbageHf-OisotopesSIMSLA-MC-ICP-MS

分类号： P534.2[天文地球—古生物学与地层学]P597.3[天文地球—地质学]