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

Vho, Alice; Rubatto, Daniela; Putlitz, Benita; Bouvier, Anne Sophie (2020). New Reference Materials and Assessment of Matrix Effects for SIMS Measurements of Oxygen Isotopes in Garnet. Geostandards and Geoanalytical Research, 44(3), pp. 459-471. Wiley 10.1111/ggr.12324

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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 seventeen 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‰.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Vho, Alice and Rubatto, Daniela

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1639-4488

Publisher:

Wiley

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

01 May 2020 12:21

Last Modified:

13 Aug 2020 01:32

Publisher DOI:

10.1111/ggr.12324

BORIS DOI:

10.7892/boris.143190

URI:

https://boris.unibe.ch/id/eprint/143190

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