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Rejuvenecimiento de la litosfera por el penacho hawaiano

Xueqing Li¹, Rainer Kind, Xiaohui Yuan

¹GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany.

|February 27, 2004

Resumen

Las islas hawaianas.

Área de la Ciencia:

La geofísica es la geofísica.
Sismología Sismología Sismología.
La tectónica de placas es la tectónica de placas.

Sus antecedentes:

El vulcanismo hawaiano está vinculado al movimiento de la litosfera oceánica sobre una pluma fija del manto.
Las imágenes sísmicas existentes carecen de resolución para diferenciar los modelos de interacción pluma-litosfera.

Objetivo del estudio:

Para mapear el grosor de la litosfera debajo de las islas hawaianas utilizando funciones de receptor sísmico.
Para investigar las interacciones pluma-litosfera y su efecto en la formación de la cadena de islas.

Principales métodos:

Aplicación de la técnica de la función del receptor de ondas S. Técnica de la función del receptor de ondas S.
Análisis de datos sísmicos de tres estaciones permanentes de banda ancha en las islas hawaianas.

Principales resultados:

El grosor de la litosfera es de 100-110 km bajo la Isla Grande, consistente con una placa oceánica antigua sin modificar.
La litosfera se adelgaza gradualmente a 50-60 km debajo de Kauai en un ancho de 300 km.
La evidencia sugiere que el modelo de rejuvenecimiento está activo dentro de la zona de adelgazamiento.

Conclusiones:

El penacho del manto adelgaza activamente la litosfera a lo largo de la cadena de islas hawaianas.
Es probable que la oleada topográfica más amplia sea apoyada por fuerzas dinámicas, no solo por el adelgazamiento litosférico.

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