The Zn of isotopic compositions of the Wajilitag peralkaline-carbonatite suites, Xinjiang.docx

The Zn of isotopic compositions of the Wajilitag peralkaline-carbonatite suites, Xinjiang Zn isotope ratios were analyzed using a Thermo Scientific <em>Neptune Plus</em> MC-ICP-MS instrument. Instrumental mass bias correction was obtained through sample-standard bracketing (SSB) method. Zinc isotopic analysis for each measurement is operated for three blocks of 40 cycles in the low-resolution mode. Zinc isotope data are reported in standard δ-notation in per mil relative to JMC Lyon Zn standard 3-0749L: δxZn (‰) = [(xZn/64Zn)sample/(xZn/64Zn)JMC 3-0749L-1] × 1000, where x = 66,67,68,70. A total procedural blank contains less than 3ng Zn. Long-term accuracy of δ66Zn is up to ±0.04 ‰. Analyzes of the BHVO-2 reference during the course of this study yielded δ66Zn values of 0.31±0.01 ‰, which is consistent with the reported values in the literatures (Moeller et al., 2012; Moynier et al., 2010; Sossi et al., 2015).针对新疆瓦吉里塔格过碱性-碳酸岩岩套的锌同位素比值，采用赛默飞世尔（Thermo Scientific）Neptune Plus型多接收电感耦合等离子体质谱仪（MC-ICP-MS）开展分析。仪器质量分馏校正通过样品-标准样交替法（SSB）完成。每次锌同位素测试均采用低分辨模式，设置3组循环，每组包含40个测量周期。锌同位素数据以标准δ标记法报告，相对于JMC Lyon Zn标准3-0749L，单位为千分率：δˣZn (‰) = [(ˣZn/⁶⁴Zn)样品/(ˣZn/⁶⁴Zn)JMC 3-0749L - 1] × 1000，其中x取值为66、67、68、70。全程流程空白的锌总量低于3ng。δ⁶⁶Zn的长期精度可达±0.04‰。本研究期间对BHVO-2参考物质的分析得到δ⁶⁶Zn值为0.31±0.01‰，与已发表文献中的报道结果一致（Moeller等，2012；Moynier等，2010；Sossi等，2015）。