THE ABSOLUTE AGE OF BASALTS FROM THE PRE-JURASSIC BASEMENT OF THE WEST SIBERIAN PLATE (from 40Ar/39Ar data)
A.Ya. Medvedev, A.I. Al'mukhamedov, M.K. Reichow*, A.D. Saunders*, R.V. White**, and N.P. Kirda**
Institute of Geochemistry, Siberian Branch of the RAS,
1a ul. Favorskogo, Irkutsk, 664033, Russia
* Leicester University, Leicester LE1 7RH, England
** Institute of Petroleum Geology, Siberian Branch of the RAS,
3 prosp. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Absolute age, craton, volcanics, superplume
Pages: 588-592
Abstract
The first absolute Ar/Ar dates have been obtained for buried basalts from the pre-Jurassic basement of the West Siberian Plate, 249-250 Ma, which correspond to the Permian-Triassic boundary. The dating shows that magmatism in East and West Siberia proceeded synchronously. This is consistent with the concepts of superplume activity just in this time span.
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