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Una explosión rápida en el movimiento de puntos calientes a través de la interacción de la tectónica y el flujo
Rakib Hassan1, R Dietmar Müller1, Michael Gurnis2
1EarthByte Group, School of Geosciences, University of Sydney, Sydney, New South Wales 2006, Australia.
Nature
|May 13, 2016
Resumen
La curva de la pista del punto caliente del emperador hawaiano fue el resultado de un vigoroso flujo de manto profundo, impulsado por la subducción. Este flujo inclinó las plumas del manto y advirtió sus fuentes, explicando la geometría única de la pista.
Área de la Ciencia:
- La geofísica
- La geodinámica
- Tectónica de placas
Sus antecedentes:
- Las huellas de los puntos calientes volcánicos revelan el movimiento de las placas sobre las plumas del manto.
- Las plumas profundas del manto están enraizadas en las estructuras termoquímicas del manto inferior.
- La curva aguda de la pista de punto caliente Hawaiano-Emperador es poco conocida.
Objetivo del estudio:
- Para investigar la dinámica detrás de la curva de la pista de punto caliente Hawaiano-Emperador.
- Para modelar la convección termoquímica en el manto inferior profundo.
Principales métodos:
- Modelado numérico paleogeográficamente limitado de la convección termoquímica.
- Análisis de la dinámica del flujo del manto y la advección de la pluma.
Principales resultados:
- El flujo profundo del manto inferior bajo el Pacífico norte fue anormalmente vigoroso (100-50 Ma) debido a la subducción.
- El flujo vigoroso causó la inclinación de la pluma y la advección lateral de la fuente, formando la curva Hawaiian-Emperor.
- La deformación asimétrica del manto, influenciada por la subducción, explica las diferentes trayectorias de las pistas de puntos calientes.
Conclusiones:
- La dinámica del flujo del manto profundo, particularmente el flujo vigoroso en el norte del Pacífico, explica la curva Hawaiano-Emperador.
- Los sistemas de subducción influyeron significativamente en el flujo del manto inferior y la evolución de la pista de puntos calientes.
- La deformación asimétrica de las estructuras del manto profundo controlaba las distintas trayectorias de las pistas de puntos calientes del Pacífico.
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