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El silicato hidroso se derrite a alta presión.

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Resumen
Este resumen es generado por máquina.

Agua Agua Agua Agua Agua Agua Agua

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Área de la Ciencia:

  • La geoquímica es la geoquímica.
  • Física de las altas presiones.
  • Ciencia de los materiales ciencia de los materiales.

Sus antecedentes:

  • El comportamiento de los derretimientos de silicatos hidrosos y la solubilidad en agua en el manto de la Tierra son poco conocidos.
  • El agua tiene un impacto significativo en las propiedades del fundido como la densidad, la viscosidad y la conductividad eléctrica a presiones más bajas.

Objetivo del estudio:

  • Para investigar la estructura y las propiedades de MgSiO3 hidratado fundido bajo alta presión.
  • Para determinar la especiación del agua y la miscibilidad en silicatos fundidos a través de presiones del manto.

Principales métodos:

  • Se emplearon simulaciones de dinámica molecular de primeros principios.
  • Las simulaciones cubrieron presiones hasta el régimen del manto terrestre (136 GPa).

Principales resultados:

  • La especiación del agua cambia de moléculas/hidroxilos a estructuras extendidas con el aumento de la presión.
  • Se observa una completa miscibilidad del agua y el silicato fundido a través de la mayoría de las presiones del manto.
  • Una fusión flotante estable en la base del manto superior contendría ~ 3% de agua en peso.

Conclusiones:

  • La alta presión altera fundamentalmente la especiación del agua y promueve la miscibilidad en las fusiones de silicatos.
  • Se predice que un derretimiento hidratado (~3 wt% de agua) en la base del manto superior será detectable a través de sondeo electromagnético.