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

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J Hiess, DJ Condon, N McLean, SR Noble - Science, 2012 - science.org

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

Geoscience Opportunities for Leadership in Diversity AND Program Evaluation

Condon, Hiess, McLean, Noble

GSID: aJdEZUcAhX8J

Excerpt

The present-day 238U/235U ratio has fundamental implications for uranium-lead geochronology and cosmochronology. A value of 137.88 has previously been considered invariant and has been used without uncertainty to calculate terrestrial mineral ages. We report high-precision 238U/235U measurements for a suite of uranium-bearing minerals from 58 samples representing a diverse range of lithologies. This data set exhibits a range in 238U/235U values of> 5 per mil, with no clear relation to any petrogenetic, secular, or …

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