Tourmaline Reference Materials for the In Situ Analysis of Oxygen and Lithium Isotope Ratio Compositions

Three tourmaline reference materials sourced from the Harvard Mineralogical and Geological Museum (schorl 112566, dravite 108796 and elbaite 98144), which are already widely used for the calibration of in situ boron isotope measurements, are characterised here for their oxygen and lithium isotope co...

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Published in:Geostandards and geoanalytical research 2021-03, Vol.45 (1), p.97-119
Main Authors: Wiedenbeck, Michael, Trumbull, Robert B., Rosner, Martin, Boyce, Adrian, Fournelle, John H., Franchi, Ian A., Halama, Ralf, Harris, Chris, Lacey, Jack H., Marschall, Horst, Meixner, Anette, Pack, Andreas, Pogge von Strandmann, Philip A.E., Spicuzza, Michael J., Valley, John W., Wilke, Franziska D.H.
Format: Article
Language:English
Subjects:
Analytical methods
Boron
Boron isotopes
Fractionation
Heterogeneity
Homogeneity
Isotopes
Laboratories
Lasers
Lithium
Lithium isotopes
Mass spectrometry
Mass spectroscopy
matrix effect
Museums
Oxygen
oxygen isotopes
Reference materials
Scientific imaging
SIMS
Tourmaline
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Summary:Three tourmaline reference materials sourced from the Harvard Mineralogical and Geological Museum (schorl 112566, dravite 108796 and elbaite 98144), which are already widely used for the calibration of in situ boron isotope measurements, are characterised here for their oxygen and lithium isotope compositions. Homogeneity tests by secondary ion mass spectrometry (SIMS) showed that at sub‐nanogram test portion masses, their 18O/16O and 7Li/6Li isotope ratios are constant within ± 0.27‰ and ± 2.2‰ (1s), respectively. The lithium mass fractions of the three materials vary over three orders of magnitude. SIMS homogeneity tests showed variations in 7Li/28Si between 8% and 14% (1s), which provides a measure of the heterogeneity of the Li contents in these three materials. Here, we provide recommended values for δ18O, Δ’17O and δ7Li for the three Harvard tourmaline reference materials based on results from bulk mineral analyses from multiple, independent laboratories using laser‐ and stepwise fluorination gas mass spectrometry (for O), and solution multi‐collector inductively coupled plasma‐mass spectroscopy (for Li). These bulk data also allow us to assess the degree of inter‐laboratory bias that might be present in such data sets. This work also re‐evaluates the major element chemical composition of the materials by electron probe microanalysis and investigates these presence of a chemical matrix effect on SIMS instrumental mass fractionation with regard to δ18O determinations, which was found to be
ISSN:1639-4488
1751-908X
DOI:10.1111/ggr.12362