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A Method for SIMS Measurement of Lithium Isotopes in Garnet: The Utility of Glass Reference Materials
Geostandards & Geoanalytical Research ( IF 2.976 ) Pub Date : 2021-05-03 , DOI: 10.1111/ggr.12383
William F. Hoover, Sarah C. Penniston‐Dorland, Lukas P. Baumgartner, Anne‐Sophie Bouvier, Don Baker, Besim Dragovic, Austin Gion

We present a novel method for the measurement of lithium isotopes in garnet utilising glass reference materials and SIMS. Measured lithium isotopic compositions of natural garnets are heterogeneous, making them unreliable reference materials for in situ determination. However, SIMS lithium isotope measurements of glasses derived from these natural garnets are isotopically identical to their parent garnets and more homogeneous, demonstrating that they can be used as reliable reference materials. To characterise the composition‐dependence of instrumental mass fractionation (IMF), oxide and silicate powders were used to synthesise custom‐made glass reference materials (CGRMs) with garnet‐equivalent compositions. Results for six CGRMs measured by SIMS show a significant linear relationship between instrumental mass fractionation and FeO and MnO contents. Corrections for this compositional IMF results in changes of up to 12‰ within the compositional range explored. Uncertainty in IMF‐corrected SIMS analyses with a 20 μm spot is in the range of 2.5 to 4.5‰, depending on the garnet composition and reference materials used. The method for in situ lithium isotope measurement in garnet by SIMS presented here is highly adaptable, valid across a range of Al‐rich garnet compositions, and yields spatial resolution and precision necessary to address a range of geological applications.

中文翻译:

石榴石中锂同位素的SIMS测量方法:玻璃参考材料的实用性

我们提出了一种利用玻璃参考材料和SIMS测量石榴石中锂同位素的新方法。测得的天然石榴石的锂同位素组成不均一,使其成为不可靠的原位参考材料决心。但是,源自这些天然石榴石的玻璃的SIMS锂同位素测量在同位素上与其母石榴石相同,并且更均一,表明它们可以用作可靠的参考材料。为了表征仪器质量分数(IMF)的成分依赖性,使用氧化物和硅酸盐粉末合成具有石榴石等效成分的定制玻璃参比材料(CGRM)。SIMS测得的六种CGRM的结果表明,仪器的质量分数与FeO和MnO含量之间存在显着的线性关系。对这种成分IMF的校正导致在所研究的成分范围内的变化高达12‰。经IMF校正的20μm斑点的SIMS分析的不确定度在2.5到4.5‰之间,取决于石榴石的成分和所用的参考物质。的方法本文介绍的SIMS在石榴石中进行原位锂同位素测量具有高度的适应性,适用于一系列富含Al的石榴石成分,并提供了解决一系列地质应用所必需的空间分辨率和精度。
更新日期:2021-05-04
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