<SUP>40</SUP>Ar-<SUP>39</SUP>Ar age of Siberian basaltic volcanism

Five of six samples representing the entire stratigraphic sequence (~3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40Ar-39Ar plateau ages between 248.3 ± 1.7 Ma and 246.9 ± 2.5 Ma relative to an age of 520.4 Ma for the hornblende standard, MMhb-1. These results clarify some discrepancies in existing data and confirm that eruption of the bulk of Siberian basalts was close to 248 Ma and possibly lasted less than 2 Ma. Although the violence of this volcanism may have caused the massive extinctions at the Permo-Triassic boundary, the onset of changes across this boundary seems to have been distinctly earlier