The timing and extent of the eruption of the Siberian Traps large igneous province: Implications for the end-Permian environmental crisis

Reichow, M. K. and Pringle, M. S. and Al'Mukhamedov, A. I. and Allen, M. B. and Andreichev, V. L. and Buslov, M. M. and Davies, C. E. and Fedoseev, G. S. and Fitton, J. G. and Inger, S. and Medvedev, A. Ya and Mitchell, C. and Puchkov, V. N. and Safonova, I. Yu and Scott, R. A. and Saunders, A. D. (2009) The timing and extent of the eruption of the Siberian Traps large igneous province: Implications for the end-Permian environmental crisis. Earth and Planetary Science Letters, 277 (1-2). pp. 9-20. DOI 10.1016/j.epsl.2008.09.030

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Abstract

We present new high-precision 40Ar/39Ar ages on feldspar and biotite separates to establish the age, duration and extent of the larger Siberian Traps volcanic province. Samples include basalts and gabbros from Noril'sk, the Lower Tunguska area on the Siberian craton, the Taimyr Peninsula, the Kuznetsk Basin, Vorkuta in the Polar Urals, and from Chelyabinsk in the southern Urals. Most of the ages, except for those from Chelyabinsk, are indistinguishable from those found at Noril'sk. Cessation of activity at Noril'sk is constrained by a 40Ar/39Ar age of 250.3 ± 1.1 Ma for the uppermost Kumginsky Suite. The new 40Ar/39Ar data confirm that the bulk of Siberian volcanism occurred at 250 Ma during a period of less than 2 Ma, extending over an area of up to 5 million km2. The resolution of the data allows us to confidently conclude that the main stage of volcanism either immediately predates, or is synchronous with, the end-Permian mass extinction, further strengthening an association between volcanism and the end-Permian crisis. A sanidine age of 249.25 ± 0.14 Ma from Bed 28 tuff at the global section and stratotype at Meishan, China, allows us to bracket the P–Tr boundary to 0.58 ± 0.21 myr, and enables a direct comparison between the 40Ar/39Ar age of the Traps and the Permo–Triassic boundary section. Younger ages (243 Ma) obtained for basalts from Chelyabinsk indicate that volcanism in at least the southern part of the province continued into the Triassic.

Item Type: Article
Uncontrolled Keywords: 08AREP; IA57; CASP
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
99 - Other
05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title: Earth and Planetary Science Letters
Volume: 277
Page Range: pp. 9-20
Identification Number: 10.1016/j.epsl.2008.09.030
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/627

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