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

Medientyp: E-Artikel

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

Beteiligte: Wiedenbeck, Michael [VerfasserIn]; Trumbull, Robert B. [VerfasserIn]; Rosner, Martin [VerfasserIn]; Boyce, Adrian [VerfasserIn]; Fournelle, John H. [VerfasserIn]; Franchi, Ian A. [VerfasserIn]; Halama, Ralf [VerfasserIn]; Harris, Chris [VerfasserIn]; Lacey, Jack H. [VerfasserIn]; Marschall, Horst [VerfasserIn]; Meixner, Anette [VerfasserIn]; Pack, Andreas [VerfasserIn]; Pogge von Strandmann, Philip A.E. [VerfasserIn]; Spicuzza, Michael J. [VerfasserIn]; Valley, John W. [VerfasserIn]; Wilke, Franziska D.H. [VerfasserIn]; 1GFZ German Research Centre for Geosciences Potsdam 14473 Germany [VerfasserIn]; 2Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA 02543 USA [VerfasserIn]; 3Scottish Universities Environmental Research Centre East Kilbride G75 0QF UK [VerfasserIn]; 4Department of Geoscience University of Wisconsin Madison WI 53706 USA [VerfasserIn]; 5School of Physical Sciences Open University Milton Keynes MK7 6AA UK [VerfasserIn]; 6Department of Geology University of Maryland College Park MD 20742 USA [VerfasserIn]; 7Department of Geological Sciences University of Cape Town Rondebosch 7701 South Africa [VerfasserIn]; 8National Environmental Isotope FacilityBritish Geological Survey Keyworth NG12 5GG UK [VerfasserIn]; [...]

Erschienen: GEO-LEOe-docs (FID GEO), 2020-11-07

Sprache: Englisch

DOI: https://doi.org/10.23689/fidgeo-3974

Schlagwörter: lithium isotopes ; tourmaline ; reference materials ; SIMS ; oxygen isotopes ; matrix effect

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Beschreibung: 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 < 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 512 splits have been produced of each material, assuring their availability for many years into the future. ; Key Points: Three widely available tourmaline reference materials are characterized for δ7Li, δ17O and δ18O, while new EPMA and SIMS measurements refine their major element compositions. SIMS data ...

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