Rapid eruption of Siberian flood-volcanic rocks and evidence for coincidence with the Permian-Triassic boundary and mass extinction at 251 Ma

Details Rapid eruption of Siberian flood-volcanic rocks and evidence for coincidence with the Permian-Triassic boundary and mass extinction at 251 Ma Rapid eruption of Siberian flood-volcanic rocks and evidence for coincidence with the Permian-Triassic boundary and mass extinction at 251 Ma

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003e%26psl.214...75k&link_type=abstract

Earth and Planetary Science Letters, Volume 214, Issue 1-2, p. 75-91.

Mathematics

Logic

47

U-Pb Ages, Siberian Flood Volcanism, Permo-Triassic Boundary, Perovskite, Zircon

Scientific paper

The Siberian flood-volcanic event is the most voluminous and explosive, continental, volcanic event known in the Phanerozoic record. U-Pb perovskite and zircon ages were obtained for lavas of the lowermost unit (251.7+/-0.4 Ma) and near-uppermost unit (251.1+/-0.3 Ma), respectively, of the volcanic sequence in the Maymecha-Kotuy area, Russia. Along with stratigraphic correlations and paleomagnetic evidence, these ages suggest that rapid extrusion of the entire ~6500 m thick composite sequence occurred in less than 1 million years. The time of extrusion coincides precisely with an age of 251.4+/-0.3 Ma previously obtained for the Permian-Triassic mass-extinction event, the most devastating biotic crisis known. Emplacement of the Noril'sk-Talnakh ore-bearing intrusions, notable for their prodigious Cu-Ni-PGE deposits, was synchronous with these two major geologic events at 251.2+/-0.3 Ma. The Guli volcanic-intrusive complex in the Maymecha-Kotuy area appears to represent the final mafic magmatism of the entire Siberian flood-volcanic event. Baddeleyite from a carbonatite that intrudes the complex gives an age of 250.2+/-0.3 Ma, and shows possible 231Pa excess. The Bolgokhtokh granodiorite stock has a zircon age of 229.0+/-0.4 Ma, and represents the youngest known magmatism in the region.

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