238U/235U Systematics in Terrestrial Uranium-Bearing Minerals

By J. Hiess, D. Condon, N. McLean, S. Noble. Science, 2012

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Community‐Derived Standards for LA‐ICP‐MS U‐(Th‐)Pb Geochronology – Uncertainty Propagation, Age Interpretation and Data Reporting (2016, methodology): “The same features can be seen in monazite reference material data where common Pb and excess 206Pb from initial 230Th disequilibrium result in an otherwise reversely discordant ‘Stern’ monazite being ‘concordant’ at an age older than its true age (ca. 512 Ma vs. 507 Ma, Figure 5, Table 2).”
Evaluating uncertainties in the calibration of isotopic reference materials and multi-element isotopic tracers (EARTHTIME Tracer Calibration Part II) (2015, background): “In an important development for high-precision U–Pb geo-and cosmochronology, the 238 U/ 235 U of samples has been found to vary beyond measurement precision (Stirling et al., 2007; Weyer et al., 2008; Condon et al., 2010; Hiess et al., 2012).”
U–Th–Pb zircon geochronology by ID-TIMS, SIMS, and laser ablation ICP-MS: Recipes, interpretations, and opportunities (2015, background): “2 241 Additional factors to take into account are the values for the natural 238 U/ 235 U ratio in dated 242 materials (Condon et al., 2010; Hiess et al., 2012) and of uranium decay constants (Schoene 243 et al., 2006; Mattinson, 2010; Boehnke and Harrison, 2014).”