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

Autor: Yanay N; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA., Wang Z; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA., Dettman DL; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA.; Estuary Research Center, Shimane University, Shimane, Japan., Quade J; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA., Huntington KW; Department of Earth and Space Sciences and IsoLab, University of Washington, Seattle, WA 98195, USA., Schauer AJ; Department of Earth and Space Sciences and IsoLab, University of Washington, Seattle, WA 98195, USA., Nelson DD; Aerodyne Research Inc., Billerica, MA 01821, USA., McManus JB; Aerodyne Research Inc., Billerica, MA 01821, USA., Thirumalai K; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA., Sakai S; Institute of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan., Rebaza Morillo A; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA., Mallik A; Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2022 Oct 28; Vol. 8 (43), pp. eabq0611. Date of Electronic Publication: 2022 Oct 26.
DOI: 10.1126/sciadv.abq0611
Abstrakt: 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 CO 2 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 17 O abundance in the sample. A temperature calibration based on 406 analyses of CO 2 produced by digestion of 51 synthetic carbonates equilibrated at 6° to 1100°C is consistent with results for natural carbonates and previous calibrations. Our system results were indistinguishable from IRMS systems after replicating the InterCarb interlaboratory calibration. Measurement by TILDAS could change the landscape for clumped isotope analysis.
Databáze: MEDLINE