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Reacción de asociación en forsterita bajo compresión por choque.
Science (New York, N.Y.)
|October 9, 1981
Resumen
La compresión por choque de la forsterita (Mg2SiO4) a altas presiones revela su descomposición en vidrio MgO y MgSiO3. Esto apoya la fase de alta presión que es un ensamblaje de MgSiO ((3) perovskita y MgO.
Área de la Ciencia:
- Física de los minerales Física de los minerales
- La geoquímica es la geoquímica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- La forsterita (Mg2SiO4) es un componente importante del manto superior de la Tierra.
- Comprender su comportamiento bajo presión extrema es crucial para la geofísica y la ciencia planetaria.
- Estudios anteriores sugirieron diferentes fases de alta presión para la forsterita.
Objetivo del estudio:
- Para investigar las transiciones de fase de alta presión de la forsterita bajo compresión de choque.
- Para determinar los productos de descomposición de la forsterita a presiones extremas.
- Para apoyar o refutar los modelos existentes del comportamiento de alta presión de la forsterita.
Principales métodos:
- Se utilizó la microscopía electrónica de transmisión (TEM) para el análisis microstructural detallado.
- Las muestras de forsterita fueron sometidas a una compresión de choque que alcanzó presiones máximas de 78 a 92 gigapascals.
- El análisis se centró en identificar las fases presentes después de la carga de choque.
Principales resultados:
- La forsterita golpeada se transforma en un ensamblaje de vidrio de óxido de magnesio (MgO) y silicato de magnesio (MgSiO3).
- Las observaciones microscópicas confirmaron los productos de descomposición a nanoescala.
- Los productos observados son consistentes con una fase específica de alta presión.
Conclusiones:
- La descomposición de la forsterita a MgO más MgSiO ((3) vidrio bajo choque apoya fuertemente una fase específica de alta presión.
- Esta fase se interpreta como un ensamblaje de MgSiO ((3) perovskita y MgO.
- Los hallazgos refinan nuestra comprensión de la mineralogía profunda de la Tierra y la física de las ondas de choque.
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