A minimum U---Pb age for Siberian flood-basalt volcanism

Details A minimum U---Pb age for Siberian flood-basalt volcanism A minimum U---Pb age for Siberian flood-basalt volcanism

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.3505k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 18, pp.3505-3511

Physics

17

Scientific paper

Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a new, minimum U---Pb age obtained from zircon and baddeleyite from the mineralized Noril'sk I intrusion that cuts the lower third of this rapidly deposited, 3500-m-thick volcanic sequence near Noril'sk. This 251.2 ± 0.3 (2 ) Ma age is within analytical error of the SHRIMP U---Pb age for zircon from the Permian-Triassic boundary at Meishan, South China [251.1 ± 3.6 Ma (2 )], and confirms Siberian basaltic volcanism as a possible contributor to the mass extinction.

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