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Title: Effects of Improved 17O Correction on Interlaboratory Agreement in Clumped Isotope Calibrations, Estimates of Mineral-Specific Offsets, and Temperature Dependence of Acid Digestion Fractionation

Journal Article · · Geochemistry, Geophysics, Geosystems
DOI:https://doi.org/10.1029/2018gc008127· OSTI ID:1611378
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [7]; ORCiD logo [3]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [9]; ORCiD logo [6];  [12]; ORCiD logo [13]; ORCiD logo [10] more »; ORCiD logo [14]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [15]; ORCiD logo [16]; ORCiD logo [17]; ORCiD logo [16]; ORCiD logo [17]; ORCiD logo [18] « less
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Texas A & M Univ., College Station, TX (United States); Univ. of California, Los Angeles, CA (United States)
  3. Univ. of Washington, Seattle, WA (United States)
  4. Lab. des Sciences du Climat et de l'Environnement, Gif‐sur‐Yvette (France)
  5. Imperial College, London (United Kingdom)
  6. ETH‐Zurich (Switzerland)
  7. Univ. of Chicago, IL (United States)
  8. Heidelberg Univ. (Germany)
  9. Goethe‐Univ., Frankfurt am Main (Germany)
  10. Inst. de Physique du Globe, Paris (France)
  11. Ruhr‐Univ., Bochum (Germany); Cambridge Univ. (United Kingdom)
  12. Stony Brook Univ., NY (United States)
  13. Cambridge Univ. (United Kingdom)
  14. Hungarian Academy of Sciences, Budapest (Hungary)
  15. Jet Propulsion Lab., Pasadena, CA (United States)
  16. Univ. of South Florida, St. Petersburg, FL (United States)
  17. Univ. of California, Los Angeles, CA (United States)
  18. Grand Valley State Univ., Allendale, MI (United States)

The clumped isotopic composition of carbonate-CO2 (denoted Δ47) is a function of carbonate formation temperature and in natural samples can act as a recorder of paleoclimate, burial, or diagenetic conditions. The absolute abundance of heavy isotopes in the universal standards VPDB and VSMOW (defined by four parameters: R 13VPDB, R17VSMOW, R 18VSMOW, and λ) impact calculated Δ47 values. In this work, we investigate whether use of updated and more accurate values for these parameters can remove observed interlaboratory differences in the measured T-Δ47 relationship. Using the updated parameters, we reprocess 14 published calibration data sets measured in 11 different laboratories, representing many mineralogies, bulk compositions, sample types, reaction temperatures, and sample preparation and analysis methods. Exploiting this large composite data set (n = 1,253 sample replicates), we investigate the possibility for a “universal” clumped isotope calibration. We find that applying updated parameters improves the T-Δ47 relationship (reduces residuals) within most labs and improves overall agreement but does not eliminate all interlaboratory differences. We reaffirm earlier findings that different mineralogies do not require different calibration equations and that cleaning procedures, method of pressure baseline correction, and mass spectrometer type do not affect interlaboratory agreement. We also present new estimates of the temperature dependence of the acid digestion fractionation for Δ47 (Δ*25-X), based on combining reprocessed data from four studies, and new theoretical equilibrium values to be used in calculation of the empirical transfer function. Overall, we have ruled out a number of possible causes of interlaboratory disagreement in the T-Δ47 relationship, but many more remain to be investigated.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
SC0010288; EAR-1156134; 1713275; 093831
OSTI ID:
1611378
Alternate ID(s):
OSTI ID: 1543367
Journal Information:
Geochemistry, Geophysics, Geosystems, Vol. 20, Issue 7; ISSN 1525-2027
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 124 works
Citation information provided by
Web of Science

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Cited By (3)

Exploring the Temperature Dependence of Clumped Isotopes in Modern Porites Corals journal January 2020
Southern high-latitude warmth during the Jurassic–Cretaceous: New evidence from clumped isotope thermometry journal May 2019
The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database journal January 2019