Triple oxygen and hydrogen stable isotope composition of water in Murchison carbonaceous chondrite accessed by thermogravimetry-enabled laser spectroscopy

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-02-05 DOI:10.1016/j.chemgeo.2024.122557

Erik J. Oerter , Alexandre Garenne , Miguel Cisneros , George D. Cody , Michael Singleton , Conel M. O’D. Alexander

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引用次数: 0

Abstract

We have developed the capability to measure ¹⁷O/¹⁶O in H₂O and OH⁻ of hydrous minerals by a technique using thermogravimetric analysis coupled with isotope ratio infrared spectroscopy (TGA-IRIS) on a suite of liquid water standards, terrestrial mineral standards, multi-mineral synthetic mixtures of terrestrial samples, and Murchison carbonaceous chondrite. This ¹⁷O/¹⁶O analytical capability is combined with the previously developed TGA-IRIS capability of ¹⁸O/¹⁶O, which enables us to calculate Δ`¹⁷O values. Additionally, we have made ²H/¹H measurements by TGA-IRIS on the suite of materials. Analyses of 328 standard water samples sealed into silver tubes (0.25 μL, 174 VSMOW and 154 GISP) analyzed over the course of three years yielded δ¹⁸O values by TGA-IRIS with precision of ±0.30 ‰, δ¹⁷O of ±0.24 ‰, Δ`¹⁷O of ±0.126 ‰, and δ²H ± 7.5 ‰ (± 1 Std. Dev.). TGA-IRIS analyses of a suite of hydrous minerals (oxy-hydroxide, mica, serpentines, sulfide, phyllosillicates) yields similar precision. TGA-IRIS analyses of the CM2 carbonaceous chondrite Murchison resulted in δ¹⁸O, δ¹⁷O, Δ`¹⁷O, and δ²H values of the H₂O and/or OH⁻ from its hydrous minerals. Δ`¹⁷O values of Murchison H₂O range from 1.034 ‰ at 350 °C, to −0.368 ‰ at 650 °C, to −1.75 ‰ at 850 °C. TGA-IRIS can generate Δ`¹⁷O values of H₂O and/or OH⁻ in hydrous materials that are well within the precision needed for the analysis of meteoritic samples, as well as samples returned from asteroids, such as Ryugu and Bennu.

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默奇森碳质球粒陨石中水的三氧和氢稳定同位素组成的热重激光光谱分析

我们已经开发了一种利用热重分析和同位素比值红外光谱（TGA-IRIS）对一套液态水标准、陆地矿物标准、陆地样品的多矿物合成混合物和Murchison碳质球粒陨石进行水和OH -中17O/16O测量的技术。这种17O/16O分析能力与先前开发的TGA-IRIS 18O/16O分析能力相结合，使我们能够计算Δ ' 17O值。此外，我们对材料套件进行了2H/1H的TGA-IRIS测量。用TGA-IRIS对密封于银管（0.25 μL, VSMOW 174, GISP 154）中的328个标准水样进行了3年的分析，得到Δ 18o值，精度为±0.30‰，Δ 17O值为±0.24‰，Δ′17O值为±0.126‰，Δ 2h值为±7.5‰（±1标准差）。TGA-IRIS对一系列含水矿物（氢氧化物、云母、蛇纹石、硫化物、层状硅酸盐）的分析也得到了类似的精度。对CM2碳质球粒陨石Murchison的TGA-IRIS分析得出其含水矿物中H2O和/或OH -的Δ 18o， Δ 17O， Δ ' 17O和Δ 2h值。Δ ' 17O值在350°C时为1.034‰，650°C时为- 0.368‰，850°C时为- 1.75‰。TGA-IRIS可以在含水物质中生成H2O和/或OH -的Δ ' 17O值，其精度完全符合分析陨石样品以及从小行星（如Ryugu和Bennu）返回的样品所需的精度。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.