An evaluation of precision and accuracy of SIMS oxygen isotope analysis

An evaluation of precision and accuracy of SIMS oxygen isotope analysis
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SIMS氧同位素分析的精密度和准确度评估

DOI:
10.1016/j.sesci.2018.05.001
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发表时间:
2018-09
影响因子:
2
通讯作者:
Gang-Jian Wei
Gang-Jian Wei
中科院分区:
地球科学4区
文献类型:
--
作者:
Qing Yang;Xiao-Ping Xia;Wan-Feng Zhang;Yan-Qiang Zhang;Bo-Qin Xiong;Yi-Gang Xu;Qiang Wang;Gang-Jian Wei

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介绍了一种高精度二次离子质谱(西姆斯)锆石氧同位素比值分析方法。该分析使用中国科学院广州地球化学研究所(GIGCAS)西姆斯实验室的Cameca IMS 1280-HR进行。选择了4个标准锆石(91,500、青湖、TEMORA 2和蓬莱)进行了重复性(精密度)和准确度的评价。使用相同的方案进行分析,仪器参数不变,离子束强度尽可能保持相同。用蓬莱锆石作为外标物对仪器质量分馏进行了刻度。以91,500、清湖和TEMORA 2号锆石为未知样品,测得的锆石丰度分别为10.15 ± 0.26‰(2SD)、5.46 ± 0.24‰(2SD)和8.33 ± 0.29‰(2SD),均与推荐值在误差范围内(2SD)相符。以清湖锆石为监测样品,对锆石18 O/16 O比值进行了常规测量,半年的长期精密度为0.44‰(2SD),证明了该分析方法的可靠性。
In this study, a high-precision secondary ion mass spectrometry (SIMS) zircon oxygen isotope ratio analytical protocol is described. The analysis is conducted using a Cameca IMS 1280-HR at the SIMS Laboratory of Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). Four reference zircons (91,500, Qinghu, TEMORA 2 and Penglai) have been chosen to evaluate the reproducibility (precision) and accuracy. An identical protocol is used for the analyses, with unchanged instrumental parameters and with ion beam intensities kept as identical as possible. The Penglai zircon is used as an external reference material to calibrate the instrumental mass fractionation. The 91,500, Qinghu and TEMORA 2 zircons are used as the unknown samples, which yielded 10.15 ± 0.26‰ (2SD), 5.46 ± 0.24‰ (2SD) and 8.33 ± 0.29‰ (2SD), respectively, all consistent with the recommended values within error (2SD). A half-year long-term precision of 0.44‰ (2SD) is achieved using the Qinghu zircon as a monitoring sample for the routine measurement of zircon18O/16O ratio, which demonstrates the reliability of this analytical protocol.
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