Synchrony and Causal Relations Between Permian-Triassic Boundary Crises and Siberian Flood Volcanism

American Association for the Advancement of Science (AAAS) - Tập 269 Số 5229 - Trang 1413-1416 - 1995
Paul R. Renne1, Michael T. Black1, Zichao Zhang2, Mark A. Richards3, Asish R. Basu4
1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley CA 94709, USA
2Yichang Institute of Geology and Mineral Resources, Post Office Box 502, Yichang#N# 443003, People's Republic of China
3Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA.
4Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA

Tóm tắt

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.

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