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40Ar/39Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled
Marc K. Reichow,1Andrew D. Saunders,1*Rosalind V. White,1Malcolm S. Pringle,2Alexander I. Al'Mukhamedov,3Alexander I. Medvedev,3Nikolay P. Kirda4
Widespread basaltic volcanism occurred in the region of
the West Siberian Basin in central Russia during Permo-Triassic times.New 40Ar/39Ar age determinations on plagioclase
grains from deep boreholesin the basin reveal that the basalts were
erupted 249.4 ± 0.5million years ago. This is synchronous with
the bulk of the SiberianTraps, erupted further east on the Siberian
Platform. The ageand geochemical data confirm that the West Siberian
Basin basaltsare part of the Siberian Traps and at least double the
confirmedarea of the volcanic province as a whole. The larger area of
volcanismstrengthens the link between the volcanism and the
end-Permianmass extinction.
1 Department of Geology, University of
Leicester, Leicester LE1 7RH, UK.
2 Scottish Universities Environmental Research
Centre (SUERC), Scottish Enterprise Technology Park, Rankine Avenue,
East Kilbride G75 0QF, UK.
3 Institute of
Geochemistry, Favorsky Street, Post Office Box 4019, Irkutsk 664033, Russia.
4 Institute of Geology Oil and Gas, Koptyug
Avenue 3, Novosibirsk 630090, Russia.
*
To whom correspondence should be addressed. E-mail: ads{at}le.ac.uk
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[DOI: 10.1126/science.1073209] |Summary »|Full Text »|PDF »
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