Summary
This laboratory study investigated isotopic fractionation during controlled precipitation of calcite from aqueous solution, examining how precipitation rate, temperature, and saturation state influence 13C18O bonding patterns. The results indicate that whilst precipitation rate does not affect clumped isotope composition, temperature and saturation state are significant controls on isotopic partitioning. The findings suggest that synthetic calcite precipitation in these experiments approached but did not fully achieve oxygen isotope equilibrium, offering insights for palaeoclimate and environmental proxy interpretation.
UK applicability
This fundamental geochemical research has limited direct application to UK farming systems or soil health policy. However, the isotopic methods and equilibrium fractionation relationships may inform UK-based studies using carbonate isotopes as environmental tracers or palaeoclimate proxies in terrestrial and aquatic research.
Key measures
Δ47 (clumped isotope composition), 13C/12C ratio, 18O/16O ratio, calcite–water fractionation factors, precipitation rates (10−6.88 to 10−8.20 mol m−2 s−1), temperature (10, 20, 30°C), saturation state
Outcomes reported
The study measured 13C/12C, 18O/16O, and clumped 13C18O isotope ratios in calcite precipitated from aqueous solutions under controlled conditions. It quantified the relationships between precipitation rate, temperature, saturation state, and isotopic fractionation factors in synthetic calcite formation.
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