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Journal of the Geological Society; 2006; v. 163; issue.6; p. 901-904;
DOI: 10.1144/0016-76492006-096
© 2006 Geological Society of London

Short Communication

Oblique rift geometry of the West Siberian Basin: tectonic setting for the Siberian flood basalts

Mark B. Allen1, Lester Anderson2, Roger C. Searle1 & Misha Buslov3

1 1Department of Earth Sciences, Durham University, Durham DH1 3LE, UK (e-mail: m.b.allen@durham.ac.uk)
2 2CASP, Department of Earth Sciences, University of Cambridge, West Building, 181A Huntingdon Road, Cambridge CB3 0DH, UK
3 3United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

We use magnetic intensity data to determine the geometries of basalt-filled rifts of the West Siberian Basin. En echelon graben arrays suggest a component of right-lateral, north–south shear during east–west extension (present co-ordinates). Several major exposed faults at the basin margins, mainly within the Altaid orogenic belt, underwent right-lateral strike-slip in the Late Permian–Early Triassic interval. The combined datasets show that the Siberian flood basalts were erupted during right-lateral oblique extension between the Urals and the Siberian craton, centred on a triple junction in the NE of the West Siberian Basin.