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Las transiciones de tejido inducidas por el agua en olivino
1University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN 55455, USA.
Science (New York, N.Y.)
|August 25, 2001
Resumen
La adición de agua a la olivina altera significativamente la anisotropía sísmica en el manto superior de la Tierra. Este hallazgo ayuda a explicar las complejas observaciones sísmicas en regiones como el Pacífico central y las zonas de subducción.
Área de la Ciencia:
- La geofísica es la geofísica.
- Física mineral Física de los minerales
- Sismología Sismología Sismología.
Sus antecedentes:
- La interpretación de la anisotropía sísmica en el manto superior generalmente se basa en tejidos olivinos pobres en agua.
- Los modelos existentes luchan por explicar los patrones anómalos de anisotropía sísmica observados en ciertas regiones.
Objetivo del estudio:
- Para investigar el impacto de un contenido significativo de agua en tejidos de olivino.
- Reevaluar la relación entre la geometría de flujo del manto y la anisotropía sísmica en condiciones de agua.
- Para explicar las desconcertantes observaciones de anisotropía sísmica en el manto superior.
Principales métodos:
- Deformación experimental de olivino con contenido de agua controlado y alto.
- Análisis de la orientación preferida cristalográfica resultante (CPO) o la orientación preferida en celosía (LPO).
- Modelado de la anisotropía sísmica basado en tejidos derivados experimentalmente.
Principales resultados:
- El alto contenido de agua en el olivino cambia dramáticamente la relación entre el flujo y la anisotropía sísmica.
- Las telas de olivino hidroso pueden producir patrones de anisotropía sísmica que difieren significativamente de los de olivino seco.
- La presencia de agua abundante en el olivino puede explicar la anisotropía anómala en el Pacífico central y los patrones complejos en las zonas de subducción.
Conclusiones:
- El enriquecimiento de agua en el manto superior es un factor crítico que influye en la anisotropía sísmica.
- Reinterpretar la anisotropía sísmica requiere considerar el papel del agua en el olivino.
- Las regiones del manto hidroso pueden exhibir distintas firmas sísmicas que ahora se pueden entender mejor.
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