New Reference Materials and Assessment of Matrix Effects for SIMS Measurements of Oxygen Isotopes in Garnet

Details

Serval ID
serval:BIB_42584B33E8D8
Type
Article: article from journal or magazin.
Collection
Publications
Title
New Reference Materials and Assessment of Matrix Effects for SIMS Measurements of Oxygen Isotopes in Garnet
Journal
Geostandards and Geoanalytical Research
Author(s)
Vho Alice, Rubatto Daniela, Putlitz Benita, Bouvier Anne-Sophie
ISSN
1639-4488
1751-908X
Publication state
Published
Issued date
09/2020
Peer-reviewed
Oui
Volume
44
Number
3
Pages
459-471
Language
english
Abstract
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‰.
Keywords
oxygen isotopes, SIMS, ion microprobe, reference materials, garnet
Web of science
Funding(s)
Swiss National Science Foundation / 200021_166280
Create date
08/12/2020 11:37
Last modification date
15/07/2024 10:59
Usage data