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Sincronicidad de las trampas siberianas y el límite permiano-triásico
Science (New York, N.Y.)
|December 11, 1992
Resumen
El evento de extinción del Pérmico-Triásico fue probablemente causado por el vulcanismo de inundación siberiano. Esta erupción masiva liberó dióxido de azufre, lo que llevó al enfriamiento global y a los cambios en el nivel del mar que desencadenaron la extinción.
Área de la Ciencia:
- Geología Geología Geología.
- Paleontología Paleontología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El límite entre el Pérmico y el Triásico (P-Tr) marca un evento significativo de extinción masiva.
- Las trampas siberianas representan una gran provincia ígnea asociada con el vulcanismo basáltico de inundación.
Objetivo del estudio:
- Para investigar el momento de la intrusión de Norilsk I en relación con el límite P-Tr.
- Para probar la hipótesis que vincula el vulcanismo de las inundaciones siberianas con la extinción P-Tr.
Principales métodos:
- La datación con uranio y plomo de los zircones utilizando una sonda iónica.
- Análisis geocronológico de zircones de la intrusión de Noril'sk I y un tufo límite P-Tr.
Principales resultados:
- Las edades del zircón de la intrusión de Norilsk I coinciden estrechamente con las edades de un tufo en el límite P-Tr (dentro de +/- 4 millones de años).
- Los hallazgos apoyan la relación comagmática entre la intrusión de Norilsk I y las trampas siberianas.
Conclusiones:
- El vulcanismo de inundación siberiano es una causa probable de la extinción P-Tr.
- Las emisiones volcánicas (por ejemplo, dióxido de azufre) pueden haber inducido el enfriamiento global, la expansión de la capa de hielo, las lluvias ácidas y las fluctuaciones del nivel del mar, contribuyendo a la extinción masiva.
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