Comparison of clumped isotope signatures of dolomite cements to fluid inclusion thermometry in the temperature range of 73-176 °C

• Published in: Geochimica et Cosmochimica Acta
• Main Authors: Came, Rosemarie E., Azmy, Karem, Tripati, Aradhna, Olanipekun, Babatunde-John
• Other Authors: Department of Earth Sciences Durham, Durham University, Memorial University of Newfoundland = Université Memorial de Terre-Neuve St. John's, Canada (MUN), Department of Earth, Planetary and Space Sciences Los Angeles (EPSS), University of California Los Angeles (UCLA), University of California (UC)-University of California (UC), Department of Atmospheric and Oceanic Sciences Los Angeles (AOS), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: ACL; acid fractionation; boat harbor formation; body temperatures; c-13-o-18 bonds; Calibration; canada implications; carbonate minerals; Clumped isotopes; Dolomite; lower ordovician; northern peninsula; st-george group; western newfoundland; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Boat Harbor; Canada; Newfoundland
• Online Access: https://hal.science/hal-02572320; https://hal.science/hal-02572320/document; https://hal.science/hal-02572320/file/Came_etal_GeCA_2017.pdf; https://doi.org/10.1016/j.gca.2016.10.028

WOS:000393125500003 International audience Widespread application of the novel clumped isotope paleothermometer (D47) using dolomite samples from shallow crustal settings has been hindered by a lack of adequate constraints on clumped isotope systematics in dolomites that formed at temperatures greater than 50 degrees C. Consequently, many high-temperature applications involving diagenetic dolomites have required an assumption that the relationship between temperature and D47 in diagenetic dolomite resembles the theoretical temperature dependence for calcite. Here we present D47 results from dolomite cements for which precipitation temperatures were determined independently using fluid inclusion microthermometry. We compare a rock-based "calibration" for samples from the temperature range of similar to 73 to 176 degrees C to previously published laboratory-derived calibrations for synthetic calcites. This novel combination of approaches yields results that are broadly consistent with results reported from controlled laboratory experiments, providing an important confirmation of the utility of clumped isotopes in real-world systems. Our results suggest that the D47 of dolomite cements may provide key information in the reconstruction of burial and thermal histories and also in the recognition of potential petroleum reservoirs.