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Las restricciones de los elementos altamente siderófilos en la acreción y diferenciación del sistema Tierra-Luna
James M D Day1, D Graham Pearson, Lawrence A Taylor
1Department of Earth and Planetary Science, University of Tennessee, Knoxville, TN 37996, USA. jday13@utk.edu
Science (New York, N.Y.)
|January 16, 2007
Resumen
Nuevos datos revelan la Luna.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Ciencias planetarias Ciencias planetarias.
- Cosmoquímica es la cosmoquímica.
Sus antecedentes:
- Los elementos altamente siderófilos (HSEs, por sus siglas en inglés) proporcionan información sobre la formación y evolución planetaria.
- Comprender la composición del manto de la Luna es crucial para descifrar su origen e historia.
- Estudios previos sugirieron diferencias en las abundancias de HSE entre la Tierra y la Luna.
Objetivo del estudio:
- Presentar un nuevo conjunto de datos combinado de elementos del grupo de renio-osmio y platino para los basaltos lunares.
- Para investigar la composición del elemento altamente siderófilo (HSE) del manto lunar.
- Para comparar los procesos de formación del manto lunar con los de la Tierra.
Principales métodos:
- Análisis de los elementos del grupo de renio-osmio y platino en muestras de basalto lunar.
- Utilizando conjuntos de datos geoquímicos combinados para un análisis integral.
- Modelado de equilibrio silicato-metal y procesos de acreción tardía.
Principales resultados:
- Los basaltos lunares exhiben abundancias uniformemente bajas de elementos altamente siderófilos (HSEs).
- El manto lunar posee relaciones de HSE condríticas a largo plazo, pero las abundancias absolutas son ~ 20 veces más bajas que las de la Tierra.
- La acreción tardía lunar fue composicionalmente similar a la de la Tierra, pero más pequeña en volumen y terminó antes.
Conclusiones:
- La formación del manto lunar y terrestre involucró procesos similares de impacto gigante, formación del núcleo y acreción tardía.
- Las diferencias en las abundancias de HSE se atribuyen a las variaciones en el volumen y la duración de la acreción tardía.
- El manto de la Luna experimentó menos adición de material en etapa tardía en comparación con la Tierra.
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