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El impacto del asteroide Chicxulub y la extinción masiva en el límite Cretácico-Paleógeno
Peter Schulte1, Laia Alegret, Ignacio Arenillas
1GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5, D-91054 Erlangen, Germany. schulte@geol.uni-erlangen.de
Science (New York, N.Y.)
|March 6, 2010
Resumen
El impacto del asteroide Chicxulub, no el volcanismo de Deccan, desencadenó la extinción masiva del Cretácico-Paleógeno. Las capas de eyecciones globales y los registros fósiles confirman el impacto.
Área de la Ciencia:
- Paleontología Paleontología.
- Geología Geología Geología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El límite Cretácico-Paleógeno (K-Pg), hace 65,5 millones de años, significa un gran evento de extinción masiva.
- Esta extinción coincidió con el impacto del asteroide Chicxulub y la inundación del volcanismo basáltico de Deccan.
Objetivo del estudio:
- Para sintetizar los registros estratigráficos globales a través de la frontera K-Pg.
- Para evaluar las causas propuestas del evento de extinción masiva.
Principales métodos:
- Análisis de la estratigrafía global.
- Análisis de la composición de depósitos ricos en eyecciones.
- Correlación de los datos temporales con el registro fósil y los modelos ambientales.
Principales resultados:
- Se identificó un depósito rico en eyecciones distribuido globalmente vinculado al impacto de Chicxulub en el límite K-Pg.
- El momento de la capa eyectada se alinea con el inicio de las extinciones masivas.
- Los patrones ecológicos en el registro fósil coinciden con los cambios ambientales modelados como la oscuridad y el enfriamiento.
Conclusiones:
- El impacto de Chicxulub se identifica como el desencadenante principal de la extinción masiva del Cretácico-Paleógeno.
- La evidencia apoya el papel del impacto en causar perturbaciones ambientales globales que conducen a la extinción.
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