A minimum UPb age for Siberian flood-basalt volcanism

Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a new, minimum UPb age obtained from zircon and baddeleyite from the mineralized...

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Bibliographic Details
Published in:Geochimica et cosmochimica acta 1996-09, Vol.60 (18), p.3505-3511
Main Authors: Kamo, S.L., Czamanske, G.K., Krogh, T.E.
Format: Article
Language:English
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Summary:Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a new, minimum UPb age obtained from zircon and baddeleyite from the mineralized Noril'sk I intrusion that cuts the lower third of this rapidly deposited, 3500-m-thick volcanic sequence near Noril'sk. This 251.2 ± 0.3 (2σ) Ma age is within analytical error of the SHRIMP UPb age for zircon from the Permian-Triassic boundary at Meishan, South China [251.1 ± 3.6 Ma (2σ)], and confirms Siberian basaltic volcanism as a possible contributor to the mass extinction.
ISSN:0016-7037
1872-9533
DOI:10.1016/0016-7037(96)00173-1