Instrumental mass fractionation during sulfur isotope analysis by secondary ion mass spectrometry in natural and synthetic glasses

Medientyp: Sonstige Veröffentlichung; E-Artikel

Titel: Instrumental mass fractionation during sulfur isotope analysis by secondary ion mass spectrometry in natural and synthetic glasses

Beteiligte: Taracsák, Z. [Verfasser:in]; Neave, D.A. [Verfasser:in]; Beaudry, P. [Verfasser:in]; Gunnarsson-Robin, J. [Verfasser:in]; Burgess, R. [Verfasser:in]; Edmonds, M. [Verfasser:in]; Halldórsson, S.A. [Verfasser:in]; Longpré, M.-A. [Verfasser:in]; Ono, S. [Verfasser:in]; Ranta, E. [Verfasser:in]; Stefánsson, A. [Verfasser:in]; Turchyn, A.V. [Verfasser:in]; Hartley, M.E. [Verfasser:in]

Erschienen: New York, NY [u.a.] : Elsevier, 2021

Ausgabe: published Version

Sprache: Englisch

DOI: https://doi.org/10.15488/14463; https://doi.org/10.1016/j.chemgeo.2021.120318

ISSN: 0009-2541

Schlagwörter: Matrix effect ; Silicate glass ; Sulfur isotopes ; Instrumental mass fractionation ; SIMS

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Beschreibung: Sulfur isotope ratios are among the most commonly studied isotope systems in geochemistry. While sulfur isotope ratio analyses of materials such as bulk rock samples, gases, and sulfide grains are routinely carried out, in-situ analyses of silicate glasses such as those formed in magmatic systems are relatively scarce in the literature. Despite a number of attempts in recent years to analyse sulfur isotope ratios in volcanic and experimental glasses by secondary ion mass spectrometry (SIMS), the effects of instrumental mass fractionation (IMF) during analysis remain poorly understood. In this study we use more than 600 sulfur isotope analyses of nine different glasses to characterise the matrix effects that arise during sulfur isotope analysis of glasses by SIMS. Samples were characterised for major element composition, sulfur content, and sulfur isotope ratios by independent methods. Our glasses contain between 500 and 3400 ppm sulfur and cover a wide compositional range, including low-silica basanite, rhyolite, and phonolite, allowing us to investigate composition-dependent IMF. We use SIMS in multi-collection mode with a Faraday cup/electron multiplier detector configuration to achieve uncertainty of 0.3‰ to 2‰ (2σ) on measured δ34S. At high sulfur content, the analytical error of our SIMS analyses is similar to that of bulk analytical methods, such as gas-source isotope ratio mass spectrometry. We find IMF causes an offset of −12‰ to +1‰ between bulk sulfur isotope ratios and those measured by SIMS. Instrumental mass fractionation correlates non-linearly with glass sulfur contents and with a multivariate regression model combining glass Al, Na, and K contents. Both ln(S) and Al-Na-K models are capable of predicting IMF with good accuracy: 84% (ln(S)) and 87% (Al-Na-K) of our analyses can be reproduced within 2σ combined analytical uncertainty after a correction for composition-dependent IMF is applied. The process driving IMF is challenging to identify. The non-linear correlation between glass S content and ...

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Instrumental mass fractionation during sulfur isotope analysis by secondary ion mass spectrometry in natural and synthetic glasses - [published Version]

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