Synchrony and causal relations between permian-triassic boundary crises and siberian flood volcanism.

نویسندگان

  • P R Renne
  • M T Black
  • Z Zichao
  • M A Richards
  • A R Basu
چکیده

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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عنوان ژورنال:
  • Science

دوره 269 5229  شماره 

صفحات  -

تاریخ انتشار 1995