High-Precision 143Nd/144Nd Ratios from NdO+ Data Corrected with in-Run Measured Oxygen Isotope Ratios
作者单位：State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of Sciences Department of Earth and Environmental SciencesLMU Munich Geo Bio-CenterLMU Munich College of Earth SciencesUniversity of Chinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2014年度（第14届）学术年会》
会议日期：2015年
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
摘 要：The NdO+technique has been considerably refined in recent years for high-precision measurement of Nd isotope ratios in low-level samples(1-5 ng Nd).As oxygen isotopic compositions may vary significantly with experimental conditions such as filament material,ionization enhancer and the ambient oxygen in the ion source,greatcareshould be taken for using correct oxygen isotopic compositions to do the isobaric oxide corrections for theconventionalNd O+*** method presented here for Nd O+data reduction and Pr O+interference corrections uses the oxygen isotope composition determined in each cycle of the Nd O+*** that purpose,we measured the small ion signals of150Nd17O+and150Nd18O+with amplifiers equipped with 1012Ωfeedback resistors,and those of Nd16O+ion beams with 1011Ω*** 1012Ωamplifiers facilitates a precise measurement of the very small150Nd17O+and150Nd18O+ion signals and calculation of highly accurate and precise143Nd/144Nd isotope ***143Nd/144Nd ratios for JNdi-1 standards and several whole-rock reference materials determined with the method on 4 ng of Nd loads are consistent with previously reported values within analytical error,with internal and external precision(2 RSE and 2 RSD)of better than 20 and 30 ppm,respectively.