Rapid Eruption of the Siberian Traps Flood Basalts at the Permo-Triassic Boundary

American Association for the Advancement of Science (AAAS) - Tập 253 Số 5016 - Trang 176-179 - 1991
Paul R. Renne1, Asish R. Basu2
1Institute of Human Origins, Geochronology Center, 2453 Ridge Road, Berkeley, CA 94709
2Department of Geological Sciences, University of Rochester, Rochester, NY 14627

Tóm tắt

The Siberian Traps represent one of the most voluminous flood basalt provinces on Earth. Laser-heating 40 Ar/ 39 Ar data indicate that the bulk of these basalts was erupted over an extremely short time interval (900,000 ± 800,000 years) beginning at about 248 million years ago at mean eruption rates of greater than 1.3 cubic kilometers per year. Such rates are consistent with a mantle plume origin. Magmatism was not associated with significant lithospheric rifting; thus, mantle decompression resulting from rifting was probably not the primary cause of widespread melting. Inception of Siberian Traps volcanism coincided (within uncertainty) with a profound faunal mass extinction at the Permo-Triassic boundary 249 ± 4 million years ago; these data thus leave open the question of a genetic relation between the two events.

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American Association for the Advancement of Science (AAAS)

Tập 253 Số 5016

176-179

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