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El manto de la Tierra es el manto terrestre.

G R Helffrich1, B J Wood

  • 1Earth and Planetary Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8551, Japan. george@geology.bristol.ac.uk

Nature
|August 3, 2001
PubMed
Resumen
Este resumen es generado por máquina.

Los datos sísmicos y geoquímicos sugieren convección de todo el manto, desafiando el modelo de manto en capas. El material crustal subducido explica las heterogeneidades observadas en el manto, lo que indica una circulación profunda del material.

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • La geoquímica es la geoquímica.
  • Física de los minerales Física de los minerales

Sus antecedentes:

  • Las observaciones sísmicas revelan estructuras de velocidad distintas en el manto de la Tierra a 410 km, 660 km y 2.700 km.
  • La capa D" a 2.700 km probablemente representa cambios químicos y térmicos, mientras que las discontinuidades más bajas sugieren transformaciones de fase mineral.
  • El material subducido parece penetrar en el manto profundo, lo que implica convección de todo el manto, sin embargo, los datos geoquímicos a menudo sugieren un manto en capas.

Objetivo del estudio:

  • Para conciliar la evidencia sísmica y geoquímica con respecto a la convección del manto.
  • Para investigar el papel del material subducido de la corteza en la estructura profunda del manto.
  • Para determinar si la convección de todo el manto es consistente con todos los datos geofísicos y geoquímicos disponibles.

Principales métodos:

  • Análisis de imágenes sismológicas, incluyendo datos tomográficos y desplazamientos de discontinuidad.
  • Examen de los análisis geoquímicos de los productos de fusión del manto basáltico.
  • Integración de los datos de flujo de calor con los hallazgos sismológicos y geoquímicos.

Principales resultados:

  • Los datos sismológicos indican que el material subducido penetra en el manto profundo, apoyando la convección de todo el manto.
  • Los datos geoquímicos han sido interpretados para sugerir un sistema de manto en capas.
  • El estudio demuestra la consistencia entre los datos geoquímicos, sismológicos y de flujo de calor bajo un modelo de convección de manto completo.

Conclusiones:

  • La convección de todo el manto está respaldada por datos geofísicos y geoquímicos integrados.
  • Las heterogeneidades observadas en el manto se atribuyen a la corteza oceánica y continental reciclada.
  • El material reciclado de la corteza terrestre constituye aproximadamente el 16% (oceánico) y el 0,3% (continental) del volumen del manto.