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Title: Age and Timing of the Permian Mass Extinctions: U/Pb Geochronology of Closed-System Zircons
Contributor(s): Mundil, R (author); Ludwig, KR (author); Metcalfe, Ian (author); Renne, PR (author)
Publication Date: 2004
DOI: 10.1126/science.1101012
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Abstract: 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.
Publication Type: Journal Article
Source of Publication: Science, v.305, p. 1760-1763
Publisher: American Association for the Advancement of Science
Place of Publication: Washington DC, United States
ISSN: 0036-8075
Field of Research (FOR): 040303 Geochronology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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