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La inclinación del manto que surge por debajo de la subida del Pacífico Oriental gobierna la segmentación de la
Douglas R Toomey1, David Jousselin, Robert A Dunn
1Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403, USA. drt@uoregon.edu
Nature
|March 23, 2007
Resumen
El flujo ascendente del manto debajo de la elevación del Pacífico Este no es simétrico. Las imágenes sísmicas revelan la estructura giratoria del manto, que influye en la entrega de magma y la segmentación de la cresta.
Área de la Ciencia:
- La geofísica es la geofísica.
- Oceanografía La oceanografía es la oceanografía.
- La tectónica es la tectónica.
Sus antecedentes:
- El flujo ascendente del manto es crucial para la formación de la corteza oceánica en las cordilleras oceánicas medias.
- El flujo ascendente simétrico del manto es el supuesto prevaleciente para las crestas activas.
Objetivo del estudio:
- Para investigar la estructura del manto debajo de la elevación del Pacífico Este utilizando imágenes sísmicas.
- Para comprender la relación entre el surgimiento del manto, la distribución del magma y la segmentación de la cresta oceánica media.
Principales métodos:
- Se emplearon imágenes sísmicas para analizar la estructura isotrópica y anisotrópica del manto.
- Análisis de correlación entre la distribución del derretimiento del manto y la segmentación de la cresta de ascenso.
Principales resultados:
- La estructura isotrópica y anisotrópica del manto debajo de la elevación del Pacífico Este está girada.
- La distribución del derretimiento del manto se correlaciona con la segmentación de la cresta ascendente.
- La anisotropía sísmica indica que el flujo del manto está girado ~10 grados en sentido contrario a las agujas del reloj desde la dirección de propagación de la placa.
Conclusiones:
- El ascendente y el transporte asimetrico de la astenosfera influyen significativamente en la segmentación de la subida del Pacífico Este.
- Esta asimetría conduce a variaciones en el suministro de magma y los procesos de cresta de la cresta, que afectan a la distribución del derretimiento en el eje y fuera del eje.
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