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238 U/ 235 U Systematics in Terrestrial Uranium-Bearing Minerals
Open accessAbstract
A Better Date: Uranium-lead (U-Pb) dating, which is one of the most commonly used methods of radiometric dating for old terrestrial materials, operates by comparing the ratio of trace levels of U with its nuclear decay product Pb. This dating method, and the similar Pb-Pb method, assumes that the ratio between the two most common U isotopes ( 238 U and 235 U) is constant. By accurately measuring the 238 U/ 235 U ratio in a suite of minerals representing a range of tectonic environments, Hiess et al. (p. 1610 ; see the Perspective by Stirling ) demonstrate that this ratio is more variable than was previously thought. The variability does not reflect any systematic bias with time, location, or temperature—suggesting that ideally 238 U/ 235 U should be determined for every sample to calculate ages. In the absence of such data, a revised 238 U/ 235 U ratio for zircon minerals could significantly modify previous age estimates using U-Pb and Pb-Pb dating techniques.
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Natural fractionation of 238U/235U
Weyer, S., Anbar, A. D., Gerdes, A., Gordon, G. W., Algeo, T. J., & Boyle, E. A. (2008) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2007.11.012 · Cited by 509
Montoya-Pino, C., Weyer, S., Anbar, A. D., Pross, J., Oschmann, W., van de Schootbrugge, B., & Arz, H. W. (2010) · Geology · doi:10.1130/g30652.1 · Cited by 190
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Metadata
- Authors
- Hiess, J., Condon, D. J., McLean, N., & Noble, S. R.
- Venue
- Science
- Published
- 2012-03-30
- Volume
- 335
- Issue
- 6076
- Pages
- 1610-1614
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2157681159
- Cited by
- 822
- References
- 2
- FWCI
- 63.80
- Type
- journal article
- Language
- en
- Open access
- green
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