THE ABSOLUTE AGE OF BASALTS FROM THE PRE-JURASSIC BASEMENT OF THE WEST SIBERIAN PLATE (FROM 40AR/39AR DATA)

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.