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

  1. Frigola, J. 4
  2. Canals Artigas, Miquel 4
  3. Cacho Lascorz, Eva Isabel 4
  4. Moreno, A. 1
  5. Sierro Sánchez, Francisco Javier 2
  6. Flores Villarejo, José Abel 2
  7. Grimalt Obrador, Joan 3
  1. 1 Instituto Pirenaico de Ecología
    info

    Instituto Pirenaico de Ecología

    Zaragoza, España

    ROR https://ror.org/039ssy097

  2. 2 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

  3. 3 Instituto de Diagnóstico Ambiental y Estudios del Agua
    info

    Instituto de Diagnóstico Ambiental y Estudios del Agua

    Barcelona, España

    ROR https://ror.org/056yktd04

  4. 4 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

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Revista:
Cuadernos de investigación geográfica: Geographical Research Letters

ISSN: 0211-6820,  1697-9540

Año de publicación: 2013

Volumen: 39

Número: 1

Páginas: 7-24

Tipo: Artículo

DOI: 10.18172/CIG.1997 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Otras publicaciones en: Cuadernos de investigación geográfica: Geographical Research Letters

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/interglacia 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.

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Fuente de los datos: Dialnet