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El efecto del agua en la conductividad eléctrica del olivino
Duojun Wang1, Mainak Mookherjee, Yousheng Xu
1Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
Nature
|October 27, 2006
Resumen
El agua tiene un impacto significativo en la olivina.
Área de la Ciencia:
- La geofísica es la geofísica.
- Física de los minerales Física de los minerales
- La geoquímica es la geoquímica.
Sus antecedentes:
- El agua influye en las propiedades del manto de la Tierra como la fusión y la deformación.
- El muestreo directo del manto se limita a profundidades poco profundas.
- Los métodos geofísicos como la conductividad eléctrica son sensibles al agua, pero la respuesta de la olivina no ha sido estudiada.
Objetivo del estudio:
- Determinar experimentalmente el efecto del contenido de agua en la conductividad eléctrica del olivino.
- Para entender el papel del agua en las propiedades eléctricas del manto.
- Para estimar el contenido de agua en el manto superior de la Tierra.
Principales métodos:
- Estudio de laboratorio de agregados sintéticos policristalinos de olivina.
- Mediciones de impedancia de aire acondicionado a alta presión (4 GPa) y temperatura (8731,273 K).
- El contenido de agua varía de 0.01 a 0.08 por ciento en peso.
Principales resultados:
- La conductividad eléctrica de la olivina se correlaciona fuertemente con el contenido de agua.
- La temperatura tiene un efecto modesto en la conductividad.
- La movilidad de los protones probablemente explica la dependencia de la conductividad observada en el agua.
Conclusiones:
- La astenosfera oceánica puede contener ~10~-2) wt% de agua.
- El manto superior continental probablemente tiene <10(-3) wt% de agua.
- El contenido de agua influye significativamente en la conductividad eléctrica del manto, lo que ayuda a las interpretaciones geofísicas.
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