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Science 17 September 2004:
Vol. 305. no. 5691, pp. 1760 - 1763
DOI: 10.1126/science.1101012
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Reports

Age and Timing of the Permian Mass Extinctions: U/Pb Dating of Closed-System Zircons

Roland Mundil,1 Kenneth R. Ludwig,1 Ian Metcalfe,2 Paul R. Renne1,3

The age and timing of the Permian-Triassic mass extinction have been difficult to determine because zircon populations from the type sections are typically affected by pervasive lead loss and contamination by indistinguishable older xenocrysts. Zircons from nine ash beds within the Shangsi and Meishan sections (China), pretreated by annealing followed by partial attack with hydrofluoric acid, result in suites of consistent and concordant uranium/lead (U/Pb) ages, eliminating the effects of lead loss. The U/Pb age of the main pulse of the extinction is 252.6 ± 0.2 million years, synchronous with the Siberian flood volcanism, and it occurred within the quoted uncertainty.

1 Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA.
2 Asia Centre, University of New England, Armidale NSW 2351, Australia.
3 Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.

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