Triple-oxygen isotopes of stony micrometeorites by secondary ion mass spectrometry (SIMS): Olivine, basaltic glass and iron oxide matrix effects for sensitive high-mass resolution ion microprobe-stable isotope (SHRIMP-SI)

IF 1.8 3区 化学 Q4 BIOCHEMICAL RESEARCH METHODS Rapid Communications in Mass Spectrometry Pub Date : 2024-10-30 DOI:10.1002/rcm.9921
Seann J. McKibbin, Janaína N. Ávila, Trevor R. Ireland, Matthias Van Ginneken, Bastien Soens, Flore Van Maldeghem, Matthew Huber, Leonardo Baeza, Aditya Patkar, Frank Vanhaecke, Vinciane Debaille, Philippe Claeys, Steven Goderis
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Abstract

Rationale

Micrometeorites are extraterrestrial particles smaller than ~2 mm in diameter, most of which melted during atmospheric entry and crystallised or quenched to form ‘cosmic spherules’. Their parentage among meteorite groups can be inferred from triple-oxygen isotope compositions, for example, by secondary ion mass spectrometry (SIMS). This method uses sample efficiently, preserving spherules for other investigations. While SIMS precisions are improving steadily, application requires assumptions about instrumental mass fractionation, which is controlled by sample chemistry and mineralogy (matrix effects).

Methods

We have developed a generic SIMS method using sensitive high-mass resolution ion micro probe-stable isotope (SHRIMP-SI) that can be applied to finely crystalline igneous textures as in cosmic spherules. We correct for oxygen isotope matrix effects using the bulk chemistry of samples obtained by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and model bulk chemical compositions as three-component mixtures of olivine, basaltic glass and Fe-oxide (magnetite), finding a unique matrix correction for each target.

Results

Our first results for cosmic spherules from East Antarctica compare favourably with established micrometeorite groups defined by precise and accurate but consumptive bulk oxygen isotope methods. The Fe-oxide content of each spherule is the main control on magnitude of oxygen isotope ratio bias, with effects on δ18O up to ~6‰. Our main peak in compositions closely coincides with so-called ‘Group 1’ objects identified by consumptive methods.

Conclusions

The magnitude of SIMS matrix effects we find is similar to the previous intraspherule variations, which are now the limiting factor in understanding their compositions. The matrix effect for each spherule should be assessed quantitatively and individually, especially addressing Fe-oxide content. We expect micrometeorite triple-oxygen isotope compositions obtained by SIMS to converge on the main clusters (Groups 1 to 4) after correction firstly for magnetite content and secondarily for other phases (e.g., basaltic glass) in each target.

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利用二次离子质谱(SIMS)分析石质微陨石的三氧同位素:橄榄石、玄武岩玻璃和氧化铁基质对灵敏度高、质量分辨率高的离子微探针-稳定同位素(SHRIMP-SI)的影响。
理由:微陨石是直径小于 ~2 毫米的地外粒子,其中大部分在进入大气层时熔化,结晶或淬火形成 "宇宙球粒"。通过二次离子质谱法(SIMS)等方法,可以从三氧同位素组成推断出它们在陨石群中的母体。这种方法能有效地利用样本,为其他研究保留球粒。虽然 SIMS 的精确度在稳步提高,但其应用需要对仪器质量分馏进行假设,而仪器质量分馏受样品化学和矿物学(基质效应)的控制:方法:我们利用灵敏的高质分辨率离子微探针-稳定同位素(SHRIMP-SI)开发了一种通用的 SIMS 方法,可用于细晶火成岩质地,如宇宙球粒。我们利用激光烧蚀电感耦合等离子体质谱法(LA-ICP-MS)获得的样品块体化学成分来校正氧同位素基质效应,并将块体化学成分建模为橄榄石、玄武岩玻璃和氧化铁(磁铁矿)的三组分混合物,为每个目标找到了独特的基质校正方法:我们对南极洲东部宇宙球粒的首次研究结果与通过精确、准确但消耗性大的氧同位素方法确定的微陨石群相比毫不逊色。每个球粒的氧化铁含量是控制氧同位素比值偏差大小的主要因素,对 δ18O 的影响可达 ~6‰。我们的主要成分峰值与消耗性方法确定的所谓 "第 1 组 "天体非常吻合:我们发现的SIMS基质效应的大小与之前的球内变化相似,而球内变化是目前了解其成分的限制因素。每个球粒的基质效应都应单独进行定量评估,尤其是针对氧化铁的含量。我们预计通过 SIMS 获得的微陨石三氧同位素成分,在首先对磁铁矿含量进行校正,其次对每个目标中的其他相(如玄武岩玻璃)进行校正之后,将趋同于主要群(第 1 至第 4 组)。
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来源期刊
CiteScore
4.10
自引率
5.00%
发文量
219
审稿时长
2.6 months
期刊介绍: Rapid Communications in Mass Spectrometry is a journal whose aim is the rapid publication of original research results and ideas on all aspects of the science of gas-phase ions; it covers all the associated scientific disciplines. There is no formal limit on paper length ("rapid" is not synonymous with "brief"), but papers should be of a length that is commensurate with the importance and complexity of the results being reported. Contributions may be theoretical or practical in nature; they may deal with methods, techniques and applications, or with the interpretation of results; they may cover any area in science that depends directly on measurements made upon gaseous ions or that is associated with such measurements.
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