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El reciclaje impulsado por subducción de la litosfera del margen continental continental.

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La subducción de las placas oceánicas puede arrastrar y eliminar la litosfera continental de los márgenes adyacentes. Este proceso, impulsado por la tectónica de placas, adelgaza la litosfera e influye en la deformación continental.

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • La tectónica es la tectónica.
  • La geodinámica es la geodinámica.

Sus antecedentes:

  • El reciclaje de la litosfera continental es complejo y menos comprendido que el reciclaje de la litosfera oceánica.
  • La delaminación y el descenso convectivo son procesos clave en la eliminación del manto litosférico.
  • Se explora el papel de la subducción de placas oceánicas en la remoción de la litosfera continental adyacente.

Objetivo del estudio:

  • Para investigar el vínculo entre la subducción de placas oceánicas y la remoción de la litosfera continental.
  • Para explicar el adelgazamiento de la litosfera continental adyacente a las zonas de subducción.
  • Para conciliar los modelos geodinámicos de la tectónica oceánica y continental.

Principales métodos:

  • Imágenes de ondas telesísmicas del cuerpo de densos experimentos sísmicos de banda ancha.
  • Análisis de losas atlánticas y alboranas subducidas.
  • Análisis de ondas de Rayleigh para determinar el grosor del manto litosférico.

Principales resultados:

  • Volúmenes anormalmente rápidos del manto asociados con losas subducidas encontradas debajo de los márgenes continentales.
  • Mantel litosférico significativamente más delgado observado bajo los márgenes continentales.
  • La delgada litosfera se extiende desde los orógenos hacia el interior hacia los núcleos cratónicos.

Conclusiones:

  • La subducción de las placas oceánicas puede arrastrar y eliminar la base de la capa límite térmica continental.
  • Este proceso impulsa la tectónica de superficie y crea la topografía en el límite litosfera-astenosfera.
  • Conduce a descensiones secundarias y a una posible delaminación del manto litosférico.