Micro-scale (1 μm) Mg isotope analysis of olivine by NanoSIMS with online matrix correction and its application to Chang'e−5 sample

IF 5.6 1区化学 Q1 CHEMISTRY, ANALYTICAL

Talanta Pub Date : 2025-02-12 DOI:10.1016/j.talanta.2025.127733

Jia-Long Hao , Heng-Ci Tian , Chao Qi , Rui-Ying Li , Sen Hu , Yang-Ting Lin , Yong-Sheng He , Wei Yang

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引用次数: 0

Abstract

In-situ stable Mg isotope analysis of olivine, the most common mineral in igneous and metamorphic rocks, provides critical insights into their formation and timescales. However, accurate correction of significant matrix effects is hampered by the lack of olivine reference materials with forsterite (Fo) content below 80. More importantly, current techniques using secondary ion mass spectrometry (SIMS) or laser ablation-multi collector-ICP-MS (LA-MC-ICP-MS) are insufficient to decipher geological processes occurring at fine scales (<10 μm). Here, we report potential olivine reference materials with Fo contents ranging from nearly 0 to 90.8, covering a wide range and displaying homogeneous compositions within individual samples. These reference materials were developed through high-temperature experiments and the collection of extraterrestrial meteorites. Using these materials, we established a method for Mg isotope analysis on a CAMECA NanoSIMS 50L, for the first time achieving a high spatial resolution of ∼1 μm with a precision of 0.7–0.8 ‰ (1SD). We found that the matrix effect is best modelled by a BiHill equation with the ²⁴Mg/(²⁴Mg + ⁵⁶Fe) ratio. Simultaneous detection of ²⁴Mg–²⁶Mg–²⁸Si–⁵⁶Fe by NanoSIMS enable us to calibrate the matrix effect online for olivine Mg-isotope analysis. This method was successfully applied to Chang'e−5 (CE5) lunar chemically-zoned olivine crystals, revealing substantial variation of δ²⁶Mg (>4 ‰) on a micron scale (<100 μm).

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来源期刊

Talanta 化学-分析化学

CiteScore

12.30

自引率

4.90%

发文量

861

审稿时长

29 days

期刊介绍： Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome. Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.