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

A Levander¹, M J Bezada², F Niu³

¹Earth Science Department, Rice University, Houston, Texas 77005-1892, USA.

|November 14, 2014

Resumen

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.

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.

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