Titre
New Reference Materials and Assessment of Matrix Effects for SIMS Measurements of Oxygen Isotopes in Garnet
Type
article
Institution
Externe
Périodique
Auteur(s)
Vho, Alice
Auteure/Auteur
Rubatto, Daniela
Auteure/Auteur
Putlitz, Benita
Auteure/Auteur
Bouvier, Anne-Sophie
Auteure/Auteur
Liens vers les personnes
ISSN
1639-4488
Statut éditorial
Publié
Date de publication
2020-09
Volume
44
Numéro
3
Première page
459
Dernière page/numéro d’article
471
Peer-reviewed
Oui
Langue
anglais
Résumé
Accurate ion microprobe analysis of oxygen isotope ratios in garnet requires appropriate reference materials to correct for instrumental mass fractionation that partly depends on the garnet chemistry (matrix effect). The matrix effect correlated with grossular, spessartine and andradite components was characterised for the Cameca IMS 1280HR at the SwissSIMS laboratory based on sixteen reference garnet samples. The correlations fit a second-degree polynomial with maximum bias of ca. 4‰, 2‰ and 8‰, respectively. While the grossular composition range 0–25% is adequately covered by available reference materials, there is a paucity of them for intermediate compositions. We characterise three new garnet reference materials GRS2, GRS-JH2 and CAP02 with a grossular content of 88.3 ± 1.2% (2s), 83.3 ± 0.8% and 32.5 ± 3.0%, respectively. Their micro scale homogeneity in oxygen isotope composition was evaluated by multiple SIMS sessions. The reference δ18O value was determined by CO2 laser fluorination (δ18OLF). GRS2 has δ18OLF = 8.01 ± 0.10‰ (2s) and repeatability within each SIMS session of 0.30–0.60‰ (2s), GRS-JH2 has δ18OLF = 18.70 ± 0.08‰ and repeatability of 0.24–0.42‰ and CAP02 has δ18OLF = 4.64 ± 0.16‰ and repeatability of 0.40–0.46‰.
PID Serval
serval:BIB_42584B33E8D8
Date de création
2020-12-08T09:37:10.562Z
Date de création dans IRIS
2025-05-20T15:32:11Z