How to kill (almost) all life: the end-Permian extinction event
2003; Elsevier BV; Volume: 18; Issue: 7 Linguagem: Inglês
10.1016/s0169-5347(03)00093-4
ISSN1872-8383
AutoresMichael J. Benton, Richard J. Twitchett,
Tópico(s)Evolution and Paleontology Studies
ResumoAbstract The biggest mass extinction of the past 600 million years (My), the end-Permian event (251My ago), witnessed the loss of as much as 95% of all species on Earth. Key questions for biologists concern what combination of environmental changes could possibly have had such a devastating effect, the scale and pattern of species loss, and the nature of the recovery. New studies on dating the event, contemporary volcanic activity, and the anatomy of the environmental crisis have changed our perspectives dramatically in the past five years. Evidence on causation is equivocal, with support for either an asteroid impact or mass volcanism, but the latter seems most probable. The extinction model involves global warming by 6°C and huge input of light carbon into the ocean-atmosphere system from the eruptions, but especially from gas hydrates, leading to an ever-worsening positive-feedback loop, the ‘runaway greenhouse'.
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