Low-temperature isotopic fractionation of uranium

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Natural variations in uranium isotope ratios of uranium ore concentrates: Understanding the 238U/235U fractionation mechanism (2010, background): “On the other hand, U/ U variations have been attributed to oxidation and reduction (redox) processes (Schauble, 2006; Stirling et al., 2007; Weyer et al., 2008; Bopp et al., 2009).”
An algorithm for U‐Pb isotope dilution data reduction and uncertainty propagation (2011, background): “Canonically, this value has been accepted as 137.88 [Steiger and Jager, 1977], but recent studies have shown that it may vary significantly in nature [Stirling et al., 2007; Weyer et al., 2008; Brennecka et al., 2010].”
U-Pb chronology of the Solar System's oldest solids with variable 238 U/ 235 U (2010, methodology): “…440 mg whole rock fragments, randomly taken from the interior portion of an Allende specimen cut into ca. 3 mm slices, were analysed for U isotope composition at the Centre for Trace Element Analysis at the University of Otago, using the analytical procedures of Stirling et al. (2005, 2006, 2007).”
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).”