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Superplumas desde el límite núcleo-manto hasta la litosfera: implicaciones para el flujo de calor
Barbara Romanowicz1, Yuancheng Gung
1Seismological Laboratory, University of California, Berkeley, 215 McCone Hall, Berkeley, CA 94720, USA. barbara@seismo.berkeley.edu
Science (New York, N.Y.)
|April 20, 2002
Resumen
Dos superplumas que se originan en el límite núcleo-manto influyen en la estructura del manto superior, causando un flujo horizontal debajo de la litosfera. Este fenómeno explica las anomalías sísmicas y sugiere un transporte significativo de calor desde el interior profundo de la Tierra.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- La tomografía sísmica revela estructuras térmicas a gran escala en el límite entre el núcleo y el manto, denominadas superplumas.
- Comprender la dinámica del manto superior es crucial para la tectónica de placas y la convección del manto.
Objetivo del estudio:
- Para investigar la estructura anelástica tridimensional del manto superior.
- Para determinar la influencia de las superplumas del manto profundo en la dinámica del manto superior y las propiedades sísmicas.
Principales métodos:
- Modelado tridimensional de la estructura anelástica del manto superior.
- Análisis de la isotropía de la onda de corte sísmica.
Principales resultados:
- Las corrientes ascendentes térmicas de las superplumas persisten a través de la zona de transición del manto superior.
- Las corrientes ascendentes se desvían horizontalmente por debajo de la litosfera, creando una isotropía de onda de corte transversal en el Pacífico central.
- Las superplumas proporcionan calor estable y flujo horizontal a la astenosfera, lubricando el movimiento de las placas y alimentando los puntos calientes.
Conclusiones:
- Las superplumas impactan significativamente el flujo del manto superior y las propiedades sísmicas.
- El transporte de calor desde el límite núcleo-manto puede exceder las estimaciones actuales basadas solo en los flujos de puntos calientes.
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