40 Ar/ 39 Ar Dates from the West Siberian Basin: Siberian Flood Basalt Province Doubled

Autor:	Alexander I. Medvedev, Andrew D. Saunders, R. White, Marc K. Reichow, Malcolm S. Pringle, A. I. Al'mukhamedov, Nikolay P. Kirda
Rok vydání:	2002
Předmět:	Basalt Siberian High Volcanic rock geography Multidisciplinary geography.geographical_feature_category Volcano Permian Siberian Traps Geochemistry Flood basalt Geology Mantle plume
Zdroj:	Science. 296:1846-1849
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.1071671
Popis:	Widespread basaltic volcanism occurred in the region of the West Siberian Basin in central Russia during Permo-Triassic times. New 40 Ar/ 39 Ar age determinations on plagioclase grains from deep boreholes in the basin reveal that the basalts were erupted 249.4 ± 0.5 million years ago. This is synchronous with the bulk of the Siberian Traps, erupted further east on the Siberian Platform. The age and geochemical data confirm that the West Siberian Basin basalts are part of the Siberian Traps and at least double the confirmed area of the volcanic province as a whole. The larger area of volcanism strengthens the link between the volcanism and the end-Permian mass extinction.
Databáze:	OpenAIRE
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