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Acreción de la Tierra y segregación de su núcleo
Bernard J Wood1, Michael J Walter, Jonathan Wade
1Macquarie University, Department of Earth and Planetary Sciences, North Ryde, New South Wales 2109, Australia. bwood@els.mq.edu.au
Nature
|June 17, 2006
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- La Tierra se formó a partir de planetesimales durante 30-40 millones de años.
- Los núcleos planetesimales contenían hierro metálico, lo que influyó en la composición del núcleo de la Tierra.
- La composición del manto sugiere el reequilibrio del océano de magma profundo durante el crecimiento de la Tierra.
Objetivo del estudio:
- Para investigar los procesos de formación del núcleo durante la acreción de la Tierra.
- Comprender el reequilibrio de los elementos siderófilos entre el núcleo y el manto.
- Para determinar la influencia de las condiciones de alta presión en la composición del núcleo de la Tierra.
Principales métodos:
- Análisis de la composición actual del manto.
- Modelado de la diferenciación núcleo-manto.
- Estudios geoquímicos de la partición de los elementos siderófilos.
Principales resultados:
- El reequilibrio entre el núcleo y el manto se produjo en un profundo océano de magma (>400 km).
- Las condiciones de oxidación aumentaron con el tiempo a medida que la Tierra crecía.
- El núcleo de la Tierra contiene más elementos de bajo número atómico (por ejemplo, silicio, oxígeno) que núcleos planetesimales.
Conclusiones:
- La formación del núcleo de la Tierra implicó un importante reequilibrio del metal-silicato bajo alta presión.
- La fase del océano de magma fue crítica para establecer la composición actual del núcleo y el manto.
- Los procesos de acreción y la alta presión dieron forma a un núcleo de la Tierra único y rico en elementos ligeros.
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