Age and Timing of the Permian Mass Extinctions: U/Pb Dating of Closed-System Zircons-Reference-Cited by-同舟云学术

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

Published:2004-09-17 Issue:5691 Volume:305 Page:1760-1763
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Mundil Roland¹²³,Ludwig Kenneth R.¹²³,Metcalfe Ian¹²³,Renne Paul R.¹²³

Affiliation:

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.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference38 articles.

1. Timing of the Permian–Triassic biotic crisis: implications from new zircon U/Pb age data (and their limitations)

2. Analytical procedures are available as supporting material on Science Online.

3. Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique

4. U/Pb Zircon Geochronology and Tempo of the End-Permian Mass Extinction

5. Pattern of Marine Mass Extinction Near the Permian-Triassic Boundary in South China

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