(Search for iridium at the Permian-Triassic boundary at the Meishan section, Changxing, China).,Recherche de l'iridium a la limite Permien-Trias du site de Meishan, Changhsing (Republique populaire de Chine).
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1988
- handle: 10670/1.ti8hvk
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Mots-clés
End-Permian, Extinction, MeishanSujets proches
Cretaceous-Tertiary transition K-T boundary Boundary, Cretaceous-Tertiary Tertiary-Cretaceous boundary Transition, Cretaceous-Tertiary Speciation (Biology) Catastrophes Calamities Influence and resultsCiter ce document
Daniel Boclet et al., « (Search for iridium at the Permian-Triassic boundary at the Meishan section, Changxing, China).,Recherche de l'iridium a la limite Permien-Trias du site de Meishan, Changhsing (Republique populaire de Chine). », Serveur académique Lausannois, ID : 10670/1.ti8hvk
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Résumé
The presence of siderophile-enriched material at the Cretaceous-Tertiary boundary suggests that the major extinctions of living species could result from cosmic catastrophes. The flnding of the same kind of material at the Permian-Triassic boundary would be important to conflrm the influence of cosmic phenomena on extinctions. The study of the Meishan section, in China, does not provide any support to this view. Iridium, the best tracer of cosmic material, has not been detected in any of the 18 samples collected around the boundary. A relation between the Permian-Triassic extinction and a cosmic collision therefore remains hypothetical.