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Nueva evidencia sobre el tamaño y los posibles efectos del impacto de un asteroide oceánico del plioceno tardío
Science (New York, N.Y.)
|July 1, 1988
Resumen
Un gran impacto de asteroide en el Plioceno tardío esparció escombros a través del fondo del océano Pacífico sureste. Este importante evento de impacto de asteroides puede coincidir con el comienzo de la glaciación del hemisferio norte.
Área de la Ciencia:
- Geología Geología Geología.
- Paleoclimatología Paleoclimatología
- El cráter de impacto es el cráter de impacto.
Sus antecedentes:
- Los registros geológicos del Plioceno tardío son cruciales para comprender la glaciación temprana.
- Los impactos de asteroides representan eventos geológicos significativos con posibles consecuencias globales.
Objetivo del estudio:
- Identificar y caracterizar la evidencia de un impacto de un asteroide del Plioceno tardío en el sureste del Pacífico.
- Para determinar el tamaño y la importancia potencial del asteroide impactante.
- Para correlacionar el momento del impacto con el inicio de la glaciación del hemisferio norte.
Principales métodos:
- Análisis de las concentraciones de iridio en núcleos de sedimentos de aguas profundas.
- Datamiento estratigráfico de las capas de sedimentos.
Principales resultados:
- Descubrimiento de restos de impacto de asteroides extendidos a lo largo de más de 600 km del fondo del océano Pacífico sureste.
- Estimación del diámetro del asteroide impactante en un mínimo de 0,5 km, lo que sugiere que fue uno de los más grandes en la historia geológica reciente.
- Correlación de la edad estratigráfica del impacto con el momento inferido del inicio de la glaciación en el hemisferio norte.
Conclusiones:
- Un gran impacto de asteroides ocurrió a finales del Plioceno en el sureste del Pacífico.
- Este evento de impacto fue sustancial, con un proyectil de al menos 0,5 km de diámetro.
- El momento de este impacto se alinea con el inicio de una importante glaciación en el hemisferio norte, lo que sugiere un posible vínculo causal.
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