La huella de las oscilaciones globales del nivel del mar durante los últimos 530 000 años en el Golfo de León y su variabilidad durante el estadio isotópico marino 3
DOI:
https://doi.org/10.18172/cig.1997Palabras clave:
variabilidad climatica de escala milenaria, estadio isotopico marino (MIS 3), oscilaciones del nivel del mar, tamano de grano, Golfo de Leon,Resumen
El sondeo PRGL1-4, recuperado en el talud superior, ha proporcionado un registro único, continuo y de larga duración para la investigación del impacto de las oscilaciones del nivel del mar de escala glacial/interglacial durante el Pleistoceno Superior en la construcción del margen continental del Golfo de León, dominado por aportaciones sedimentarias de origen fluvial. El estudio en detalle de los cambios del tamaño de grano y la composición elemental del sedimento, junto con una robusta cronoestratigrafía basada en el registro de isótopos de oxígeno en foraminíferos planctónicos, ha permitido reinterpretar la sismoestratigrafia del margen para los últimos 530 ka. El sondeo PRGL1-4 comprende el apilamiento formado por cinco unidades depositadas durante las bajadas del nivel del mar de los últimos cinco ciclos glacial/interglacial de 100 ka. La extensa plataforma del Golfo de León ha jugado un papel determinante en el desarrollo del margen profundo puesto que las oscilaciones del nivel del mar, además de modificar el espacio de acomodación, influyeron directamente en cambios cíclicos del modelo deposicional a través de la activación y desactivación de procesos con gran capacidad erosiva y de transporte de sedimento más allá de la plataforma. El registro del sondeo PRGL1-4 también muestra el impacto de las oscilaciones del nivel del mar a escala milenaria durante el MIS 3, con evidencias claras de la ocurrencia de niveles del mar altos durante la fase inicial de todos y cada uno de los interestadios cálidos de los ciclos de Dansgaard-Oeschger. El registro PRGL1-4 supone, por tanto, la primera evidencia de un acoplamiento consistente entre las oscilaciones del nivel del mar y la variabilidad climática rápida de escala milenaria asociada a los ciclos de Dansgaard-Oeschger.Descargas
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