Wiedenbeck, M, Trumbull, RB, Rosner, M, Boyce, A, Fournelle, JH, Franchi, IA, Halama, R ORCID: https://orcid.org/0000-0002-9770-6784, Harris, C, Lacey, JH, Marschall, H, Meixner, A, Pack, A, Pogge von Strandmann, PAE, Spicuzza, MJ, Valley, JW and Wilke, FDH (2020) Tourmaline reference materials for the in situ analysis of oxygen and lithium isotope ratio compositions. Geostandards and Geoanalytical Research.

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Abstract

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 data that might be present in such datasets. This work also re‐evaluates the major element chemical composition of the materials by electron probe microanalysis and investigates the presence of a chemical matrix effect on SIMS instrumental mass fractionation with regards to δ18O determinations, which was found to be < 1.6‰ between these three materials. The final table presented here provides a summary of the isotope ratio values that we have determined for these three materials. Depending on their starting mass either 128 or 256 splits have been produced of each material, assuring their availability for many years into the future.

Item Type: Article
Additional Information: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Wiley at https://doi.org/10.1111/ggr.12362 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: tourmaline; lithium isotopes; oxygen isotopes; reference materials; SIMS; matrix effect
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GB Physical geography
Q Science > QD Chemistry
Q Science > QE Geology
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Depositing User: Symplectic
Date Deposited: 10 Sep 2020 12:48
Last Modified: 15 Dec 2020 12:08
URI: https://eprints.keele.ac.uk/id/eprint/8657

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