Linking the oxygen-17 compositions of water and carbonate reference materials using infrared absorption spectroscopy of carbon dioxide
Résumé
Joint measurements of the 18 O/ 16 O and 17 O/ 16 O ratios of carbonate minerals and waters are increasingly used to investigate various geochemical, physical and biological processes. Diverse analytical methods, each of them technically challenging in one way or another, have been developed or refined in recent years to measure oxygen-17 anomalies (Δ' 17 O) with instrumental precisions of 10 ppm or better. A critical underpinning of all these methods is how the international carbonate reference materials currently anchoring the VPDB 18 O/ 16 O scale are linked to the primary VSMOW-SLAP scale in ( 18 O/ 16 O, 17 O/ 16 O) space. For now, however, substantial systematic discrepancies persist between different groups and methods, even after all measurements are nominally standardized to VSMOW-SLAP.
Mots clés
- Triple oxygen isotope VCOF CRDS laser spectroscopy International reference materials conceptualization and funding, instrumental development, experimental design, sample preparation, data processing, reproducible source code,
- Triple oxygen isotope
- VCOF CRDS
- laser spectroscopy
- International reference materials conceptualization and funding, instrumental development, experimental design, sample preparation, data processing, reproducible source code,
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