Synchronism of the Siberian Traps and the Permian-Triassic boundary

Details Synchronism of the Siberian Traps and the Permian-Triassic boundary Synchronism of the Siberian Traps and the Permian-Triassic boundary

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...258.1760c&link_type=abstract

Science (ISSN 0036-8075), vol. 258, no. 5089, p. 1760-1763.

Computer Science

71

Cretaceous-Tertiary Boundary, Ice Formation, Polar Caps, Sulfur Dioxides, Upper Atmosphere, Earth Core, Earth Mantle, Siberia, Volcanology

Scientific paper

Uranium-lead ages from an ion probe were taken for zircons from the ore-bearing Noril'sk I intrusion that is comagmatic with, and intrusive to, the Siberian Traps. These values match, within an experimental error of +/- 4 million years, the dates for zircons extracted from a tuff at the Permian-Triassic (P-Tr) boundary. The results are consistent with the hypothesis that the P-Tr extinction was caused by the Siberian basaltic flood volcanism. It is likely that the eruption of these magmas was accompanied by the injection of large amounts of sulfur dioxide into the upper atmosphere, which may have led to global cooling and to expansion of the polar ice cap. The P-Tr extinction event may have been caused by a combination of acid rain and global cooling as well as rapid and extreme changes in sea level resulting from expansion of the polar ice cap.

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