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Historia comparativa de la Tierra y la extinción masiva del Pérmico Tardío
A H Knoll1, R K Bambach, D E Canfield
1Botanical Museum, Harvard University, Cambridge, MA 02138, USA.
Science (New York, N.Y.)
|July 26, 1996
Resumen
La extinción masiva del Pérmico tardío puede haber sido causada por el volcado anóxico del océano profundo, liberando dióxido de carbono e impactando a los organismos. Esto refleja las condiciones observadas en la Era Neoproterozoica, vinculando eventos geológicos antiguos y recientes.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Los eventos geológicos son eventos geológicos.
- Los eventos de extinción masiva son eventos de extinción masiva.
Sus antecedentes:
- La era Neoproterozoica tardía vio una convergencia de excursiones isotópicas de carbono, glaciación y precipitación inusual de carbonato.
- Estos fenómenos proporcionan un modelo para comprender condiciones similares en la Tierra del Pérmico Tardío.
Objetivo del estudio:
- Para interpretar la reaparición de las condiciones del Neoproterozoico durante el Pérmico Tardío.
- Explicar el vínculo entre los cambios paleoceanográficos y los eventos de extinción masiva.
Principales métodos:
- Desarrollo de un modelo paleoceanográfico.
- Análisis de datos estratigráficos e isotópicos.
- Comparación de los registros geológicos del Neoproterozoico y el Permiano Tardío.
Principales resultados:
- El modelo sugiere que el derrumbe del océano profundo anóxico del Pérmico tardío introdujo altas concentraciones de dióxido de carbono.
- Esta liberación de CO2 afectó los entornos superficiales y las condiciones atmosféricas.
Conclusiones:
- Las consecuencias fisiológicas y climáticas previstas se alinean con el momento y la selectividad observadas de la extinción masiva del Pérmico Tardío.
- El vuelco del océano es un mecanismo plausible para el evento de extinción del Pérmico Tardío.
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