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New Reference Materials and Assessment of Matrix Effects for SIMS Measurements of Oxygen Isotopes in Garnet
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-04-05 , DOI: 10.1111/ggr.12324 Alice Vho 1 , Daniela Rubatto 1, 2 , Benita Putlitz 2 , Anne‐Sophie Bouvier 2
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2020-04-05 , DOI: 10.1111/ggr.12324 Alice Vho 1 , Daniela Rubatto 1, 2 , Benita Putlitz 2 , Anne‐Sophie Bouvier 2
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Accurate ion microprobe analysis of oxygen isotope ratios in garnet requires appropriate reference materials to correct for instrumental mass fractionation that partly depends on the garnet chemistry (matrix effect). The matrix effect correlated with grossular, spessartine and andradite components was characterised for the Cameca IMS 1280HR at the SwissSIMS laboratory based on sixteen reference garnet samples. The correlations fit a second‐degree polynomial with maximum bias of ca . 4‰, 2‰ and 8‰, respectively. While the grossular composition range 0–25% is adequately covered by available reference materials, there is a paucity of them for intermediate compositions. We characterise three new garnet reference materials GRS2, GRS‐JH2 and CAP02 with a grossular content of 88.3 ± 1.2% (2s ), 83.3 ± 0.8% and 32.5 ± 3.0%, respectively. Their micro scale homogeneity in oxygen isotope composition was evaluated by multiple SIMS sessions. The reference δ18O value was determined by CO2 laser fluorination (δ18OLF). GRS2 has δ18OLF = 8.01 ± 0.10‰ (2s ) and repeatability within each SIMS session of 0.30–0.60‰ (2s ), GRS‐JH2 has δ18OLF = 18.70 ± 0.08‰ and repeatability of 0.24–0.42‰ and CAP02 has δ18OLF = 4.64 ± 0.16‰ and repeatability of 0.40–0.46‰.
中文翻译：
石榴石中氧同位素的SIMS新参考材料和基体效应评估
石榴石中氧同位素比率的准确离子微探针分析需要适当的参考材料来校正部分取决于石榴石化学性质（基质效应）的仪器质量分级。在瑞士SIMS实验室，基于16个石榴石参考样品，对Cameca IMS 1280HR表征了与大黄素，香茅素和辐射素成分相关的基质效应。相关系数拟合最大误差为ca的二阶多项式。分别为4‰，2‰和8‰。尽管总成分范围为0–25％可以被可用的参考材料充分覆盖，但对于中间成分而言却很少。我们表征了三种新的石榴石参考材料GRS2，GRS‐JH2和CAP02，总含量为88.3±1.2％（2 s），83.3±0.8％和32.5±3.0％。通过多次SIMS会议评估了它们在氧同位素组成中的微观均匀性。δ基准18 O值确定CO 2激光氟化（δ 18 ö LF）。GRS2具有δ 18 ö LF = 8.01±0.10‰（2小号的每个0.30-0.60 SIMS会话‰（2个内）和可重复性小号），GRS-JH2具有δ 18 ö LF = 18.70±0.08‰重复性和0.24-0.42 ‰和CAP02具有δ 18 ö LF = 4.64±0.16‰和0.40-0.46重复性‰。
更新日期：2020-04-05
中文翻译：
石榴石中氧同位素的SIMS新参考材料和基体效应评估
石榴石中氧同位素比率的准确离子微探针分析需要适当的参考材料来校正部分取决于石榴石化学性质（基质效应）的仪器质量分级。在瑞士SIMS实验室，基于16个石榴石参考样品，对Cameca IMS 1280HR表征了与大黄素，香茅素和辐射素成分相关的基质效应。相关系数拟合最大误差为ca的二阶多项式。分别为4‰，2‰和8‰。尽管总成分范围为0–25％可以被可用的参考材料充分覆盖，但对于中间成分而言却很少。我们表征了三种新的石榴石参考材料GRS2，GRS‐JH2和CAP02，总含量为88.3±1.2％（2 s），83.3±0.8％和32.5±3.0％。通过多次SIMS会议评估了它们在氧同位素组成中的微观均匀性。δ基准18 O值确定CO 2激光氟化（δ 18 ö LF）。GRS2具有δ 18 ö LF = 8.01±0.10‰（2小号的每个0.30-0.60 SIMS会话‰（2个内）和可重复性小号），GRS-JH2具有δ 18 ö LF = 18.70±0.08‰重复性和0.24-0.42 ‰和CAP02具有δ 18 ö LF = 4.64±0.16‰和0.40-0.46重复性‰。
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