6533b85dfe1ef96bd12be5f6

RESEARCH PRODUCT

Empirical calibration of the clumped isotope paleothermometer using calcites of various origins

Michael M. JoachimskiJens FiebigBernd R. SchöneJulian TödterEberhard GischlerOliver FriedrichThomas TütkenUlrike WackerAndré Bahr

subject

IsotopebiologyChemistryMineralogyFractionationbiology.organism_classificationCold seepForaminiferachemistry.chemical_compoundPaleothermometerGeochemistry and PetrologyCarbonateEggshellPhosphoric acid

description

We present the first universal calibration of the clumped isotope thermometer for calcites of various mineralizing types. These are an eggshell of an ostrich, a tropical bivalve, a brachiopod shell, cold seep carbonate, and three foraminifera samples that grew between 9 and 38 C. CaCO3 was digested at 90 C using a common acid bath. Considering a difference in phosphoric acid fractionation factors between reaction at 25 and 90 C of 0.069& (Guo et al., 2009), the function between growth temperature T and the excess of 13 C– 18 O bonds in the evolved CO2 is expressed by a linear regression between 1/T 2 and absolute D47 (R 2 = 0.9915):

yearjournalcountryeditionlanguage
2014-09-01Geochimica et Cosmochimica Acta
https://doi.org/10.1016/j.gca.2014.06.004