Marine Science Faculty Publications

Matrix Effects in Hydrogen Isotope Analysis of Silicate Glasses by SIMS

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Stable isotope, Volcanic, SIMS, Ion probe, Water, Hydrogen

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We report the results of a study of hydrogen isotope analysis of silicate glasses by secondary ion mass spectrometry (SIMS) using a Cameca 6F ion probe. Large differences between measured and true D/H ratios result from instrumental mass fractionation (IMF); the measured D/H ratios are depleted in the heavy isotope by an average of − 220‰ but with a total range of 60‰. Differences in IMF within subsets of glasses correlate with variables such as H2O abundance, density, and other chemical parameters and these variations constitute a significant matrix effect. The energy- and composition-dependence of hydrogen isotope IMF in glasses is well described by kinetic energy transfer analysis in a simple elastic two-collision cascade model, and provides important insight into the origins of matrix effects in SIMS. The analysis leads to a correction method for D/H matrix effects that predicts the measured IMF values to within ± 8‰, and an example data reduction is given for analysis of submarine glasses from the Reykjanes Ridge.

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Citation / Publisher Attribution

Chemical Geology, v. 235, issues 3-4, p. 352-365