Rapid and precise measurement of carbonate clumped isotopes using laser spectroscopy.

ABSTRACT: Carbonate clumped isotope abundance is an important paleothermometer, but measurement is difficult, slow, and subject to cardinal mass (m/z) interferences using isotope ratio mass spectrometry (IRMS). Here, we describe an optical spectroscopic measurement of carbonate clumped isotopes. We have adapted a tunable infrared laser differential absorption spectrometer (TILDAS) system to measure the abundances of four CO₂ isotopologues used for clumped isotope thermometry. TILDAS achieves the same precision (0.01‰ SE) as IRMS measurements rapidly (∼50 min per carbonate analysis) and using small samples (<2 mg of calcite), without making assumptions about ¹⁷O abundance in the sample. A temperature calibration based on 406 analyses of CO₂ produced by digestio

SUBMITTER: Yanay N 

PROVIDER: S-EPMC12419128 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature