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El interior de la Tierra. Fusión por deshidratación en la parte superior del manto inferior
Brandon Schmandt1, Steven D Jacobsen2, Thorsten W Becker3
1Department of Earth and Planetary Science, University of New Mexico, Albuquerque, NM, USA. bschmandt@unm.edu steven@earth.northwestern.edu.
Science (New York, N.Y.)
|June 14, 2014
Resumen
La zona de transición del manto de la Tierra puede contener un depósito de agua profunda. El manto descendente probablemente causa la fusión de la deshidratación, atrapando el agua por debajo de 660 kilómetros.
Área de la Ciencia:
- La geofísica es la geofísica.
- Física mineral Física de los minerales
- Sismología Sismología.
Sus antecedentes:
- La zona de transición del manto (MTZ) tiene una alta capacidad de almacenamiento de agua.
- Los depósitos profundos de H2O podrían influir en la dinámica del manto a través de la fusión por deshidratación.
Objetivo del estudio:
- Para investigar los efectos del manto descendente de la MTZ en el manto inferior.
- Para determinar el papel del agua en los procesos del manto profundo.
Principales métodos:
- Experimentos de laboratorio de alta presión que simulan las condiciones del manto.
- Modelado numérico de la convección del manto y las transiciones de fase.
- Análisis de las conversiones sísmicas P-S de una densa matriz sísmica de América del Norte.
Principales resultados:
- Los experimentos de laboratorio muestran transiciones de ringwoodita hidrosa a perovskita y (Mg,Fe) O, produciendo fusión intergranular.
- Los datos sísmicos revelan disminuciones abruptas de la velocidad por debajo de 660 km, en correlación con el inferido manto descendente.
- Estas observaciones sísmicas son consistentes con la fusión parcial.
Conclusiones:
- Es probable que una parte significativa de la MTZ esté hidratada.
- La fusión por deshidratación debajo de la MTZ puede atrapar cantidades sustanciales de H2O en la zona de transición.
- Este proceso tiene implicaciones para el ciclo de las aguas profundas y la viscosidad del manto.
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