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Biotite Reference Materials for Secondary Ion Mass Spectrometry 18 O/ 16 O Measurements
Author(s) -
Siron Guillaume,
Baumgartner Lukas,
Bouvier AnneSophie,
Putlitz Benita,
Vennemann Torsten
Publication year - 2017
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12148
Subject(s) - biotite , analytical chemistry (journal) , secondary ion mass spectrometry , isotopes of oxygen , isotope , chemistry , mass spectrometry , materials science , nuclear chemistry , physics , metallurgy , quartz , nuclear physics , chromatography
Five new biotite reference materials were calibrated at the Swiss SIMS laboratory (University of Lausanne) for oxygen isotope determination by secondary ion mass spectrometry ( SIMS ) and are available to the scientific community. The oxygen isotope composition of the biotites, UNIL _B1 to B5, was determined by laser‐heating fluorination to be 11.4 ± 0.11‰, 8.6 ± 0.15‰, 6.1 ± 0.04‰, 7.1 ± 0.05‰ and 7.6 ± 0.04‰, respectively. SIMS analyses on spots smaller than 20 μm gave a measurement repeatability of 0.3‰ (2 standard deviation, 2 s ). The matrix effect due to solid solution in natural biotite could be expressed as a linear function of X Mg and X F for biotite. No effect was found for different crystallographic orientations. SIMS analysis allows the oxygen isotope composition of biotite to be measured with a measurement uncertainty of 0.3–0.4‰ (2 s ) for biotites with similar major element compositions. A measurement uncertainty of 0.5‰ (2 s ) is realistic when F poor biotites (lower than 0.2% m/m oxides ) within the compositional range of X Mg of 0.3–0.9 were compared from different sessions. The linear correlation with F content offers a reasonable working curve for F‐rich biotites, but additional reference materials are needed to confirm the model.