Synchrony and Causal Relations Between Permian-Triassic Boundary Crises and Siberian Flood Volcanism
- 8 September 1995
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 269 (5229) , 1413-1416
- https://doi.org/10.1126/science.269.5229.1413
Abstract
The Permian-Triassic boundary records the most severe mass extinctions in Earth's history. Siberian flood volcanism, the most profuse known such subaerial event, produced 2 million to 3 million cubic kilometers of volcanic ejecta in approximately 1 million years or less. Analysis of 40 Ar/ 39 Ar data from two tuffs in southern China yielded a date of 250.0 ± 0.2 million years ago for the Permian-Triassic boundary, which is comparable to the inception of main stage Siberian flood volcanism at 250.0 ± 0.3 million years ago. Volcanogenic sulfate aerosols and the dynamic effects of the Siberian plume likely contributed to environmental extrema that led to the mass extinctions.Keywords
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