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Russian Geology and Geophysics

2008 year, number 5

The Oneka intrusive complex: a new structural type of large-scale manifestations of intrusive trap magmatism on the Siberian Platform

Yu.R. Vasil'ev a , S.N. Prusskayab, M.P. Mazurov c , A.Ya. Medvedev d , A.I. Al'mukhamedov d , M.P. Goraa
a Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
b Institute of Mining, Geology, and Geotechnology, Siberian Federal University, 35 prosp. Krasnoyarskii Rabochii, Krasnoyarsk, 660025, Russia
c Novosibirsk State University, 2 ul. Pirogova, Novosibirsk, 630090, Russia
d Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
Keywords: Intrusive traps; structural type; large-scale complex; Siberian Platform
Pages: 279-309


The Oneka intrusive complex, recognized on prospecting for hydrocarbons in the western Siberian Platform, in the northern half of the Bakhta megablock (Tunguska syneclise), holds a special position among the known and new large-scale manifestations of intrusive trap magmatism. During the process, original data on the distribution of traps in the 4.2 km thick platform cover were obtained. Diverse in morphology and size, the intrusions are of the same genesis, composition, and character of intrachamber differentiation and form a