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La inclinación del manto y la segmentación de la cresta
Satish C Singh1, Ken C Macdonald
1Laboratoire de Géosciences Marines, Institut de Physique du Globe de Paris, 4 place Jussieu, Paris 75252, France. singh@ipgp.jussieu.fr
Nature
|April 28, 2009
Resumen
El flujo ascendente del manto es típicamente simétrico, pero nuevos datos sísmicos sugieren que puede estar sesgado. Sin embargo, la evidencia de este ascenso del manto sesgado y sus implicaciones no están bien respaldadas por los datos disponibles.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- A menudo se asume que el flujo ascendente del manto en las cordilleras oceánicas medias es simétrico.
- Estudios previos sugirieron un flujo ascendente del manto basado en observaciones sísmicas de zonas de baja velocidad.
Objetivo del estudio:
- Reevaluar la interpretación de los datos sísmicos con respecto al surgimiento del manto.
- Para evaluar la confiabilidad de las conclusiones extraídas sobre el flujo del manto y la segmentación de la cresta.
Principales métodos:
- Análisis de datos de velocidad de ondas sísmicas.
- Crítica de las interpretaciones de las zonas de baja velocidad del manto (MLVZ).
Principales resultados:
- La zona de baja velocidad del manto (MLVZ) propuesta por Toomey et al. no está adecuadamente limitado por sus datos sísmicos.
- Las anomalías sísmicas observadas no apoyan definitivamente el surgimiento asimétrico del manto.
Conclusiones:
- Las inferencias con respecto al flujo ascendente del manto sesgado no están respaldadas por los datos disponibles.
- Las conclusiones sobre la segmentación de la cresta y el flujo astenosférico basadas en el surgimiento asimétrico no son confiables.
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