Journal
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
Volume 39, Issue 4, Pages 443-452Publisher
WILEY
DOI: 10.1111/j.1751-908X.2014.00325.x
Keywords
U-Pb calibration; geochronology; zircon; SIMS; IMS 1280
Categories
Funding
- research council of Denmark
- research council of Norway
- research council of Sweden
- University of Iceland
- Geological Survey of Finland
- Swedish Museum of Natural History
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Precision and accuracy in SIMS zircon geochronology strongly depend on the method of determination of the interelement ion ratios (e.g., Pb-206/U-238) from the measured secondary ion ratios (Pb-206+/U-238(+)). Six possible U-Pb calibrations (Pb/U-UO2/U, Pb/U-UO/U, Pb/UUO2/UO, Pb/UO-UO2/U, Pb/UO-UO/U, Pb/UO-UO2/UO) based on simple power law relationships, and Pb/UO2-related one-and two- (a power law) dimensional ones were compared using data acquired on the 91500 zircon reference material from one hundred measurement sessions, to determine the most statistically reliable scheme. Taking advantage of U oxide species (UO and UO2) over atomic U, due to their similar energy distribution to Pb and higher intensities, the data calibrated with Pb/UO-UO2/UO showed the smallest mean uncertainties and dispersions, and provided the best-fit calibration curve consistently. Although it was demonstrated with Temora 2 that the unknown zircon age was not changed significantly by different calibrations, its precision could be improved using the Pb/UO-UO2/UO calibration in zircon geochronology.
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