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El flujo del manto impulsa el hundimiento de las placas oceánicas
1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka, 237-0061, Japan. adam@uevora.pt
Science (New York, N.Y.)
|April 3, 2010
Resumen
La profundidad del fondo marino está controlada principalmente por el flujo del manto, no solo por la edad litosférica. Este estudio revela que las variaciones de profundidad siguen una raíz cuadrada de la distancia desde la cresta, desafiando los modelos de enfriamiento anteriores.
Área de la Ciencia:
- La geofísica es la geofísica.
- Oceanografía La oceanografía es la oceanografía.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- El hundimiento del fondo marino se atribuye tradicionalmente al enfriamiento pasivo y la densificación de la litosfera con la edad.
- La estructura de la litosfera está fundamentalmente vinculada a la convección del manto, lo que sugiere que las dinámicas de flujo son críticas.
Objetivo del estudio:
- Investigar la influencia del flujo del manto subyacente en la estructura litosférica y la profundidad del fondo marino.
- Reevaluar la relación entre la profundidad del fondo marino, la edad litosférica y la dinámica del manto.
Principales métodos:
- Análisis de las variaciones de profundidad del fondo marino a lo largo de trayectorias que representan las rutas de flujo del manto.
- Aplicación de las ecuaciones de la capa límite para modelar el enfriamiento y el hundimiento litosférico.
Principales resultados:
- La profundidad del fondo marino aumenta constantemente con la raíz cuadrada de la distancia desde la cresta del océano medio a través de toda la placa.
- Las variaciones de profundidad observadas se alinean con las predicciones de flujo del manto, sin requerir fuentes de calor adicionales en la base de la litosfera.
- El modelo demuestra una relación continua entre la distancia desde la cresta y la profundidad, refutando las observaciones previas de "aplanamiento".
Conclusiones:
- La dinámica del flujo del manto, más que la edad litosférica, es el principal impulsor del hundimiento del fondo marino.
- El modelo de enfriamiento establecido de la capa límite predice con precisión la profundidad del fondo marino a lo largo de las líneas de flujo del manto.
- Esta investigación refina nuestra comprensión de la evolución de la litosfera oceánica y su relación con la convección del manto.
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