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La evidencia isotópica de zinc para el origen de la Luna
Randal C Paniello1, James M D Day, Frédéric Moynier
1Department of Earth and Planetary Sciences and McDonnell Center for Space Sciences, Washington University, St Louis, Missouri 63130, USA.
Nature
|October 19, 2012
Resumen
La Luna está agotada en elementos volátiles, como lo demuestran los isótopos pesados de zinc en las rocas lunares. Esto sugiere una evaporación a gran escala después del impacto de formación de la Luna, lo que apoya su origen de impacto gigante.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Geología de Isótopos Geología de Isótopos.
Sus antecedentes:
- Los elementos volátiles son cruciales para la evolución planetaria, pero sus presupuestos iniciales y el agotamiento durante la formación temprana del Sistema Solar son poco conocidos.
- La Luna se considera agotada en volátiles, lo que implica una fraccionamiento de isótopos estables de elementos moderadamente volátiles debido a la pérdida de volátiles.
- El zinc exhibe una fracción isotópica significativa durante la volatilización, lo que lo convierte en un trazador valioso para las historias volátiles planetarias.
Objetivo del estudio:
- Para investigar la historia volátil de la Luna utilizando isótopos de zinc.
- Para determinar la extensión y el mecanismo del agotamiento volátil en las rocas magmáticas lunares.
- Para probar la hipótesis del impacto gigante para el sistema Tierra-Luna.
Principales métodos:
- Medición de alta precisión de isótopos de zinc y abundancias en rocas magmáticas lunares.
- Comparación de datos isotópicos y de abundancia de zinc lunar con muestras terrestres y marcianas.
- Análisis de los patrones de fraccionamiento isotópico para inferir los procesos de pérdida volátil.
Principales resultados:
- Las rocas magmáticas lunares muestran enriquecimiento en isótopos pesados de zinc y concentraciones de zinc más bajas en comparación con las rocas ígneas terrestres y marcianas.
- La Tierra y Marte exhiben composiciones isotópicas de zinc ampliamente condríticas.
- Las variaciones observadas indican una evaporación de zinc a gran escala, probablemente una formación posterior a la Luna, en lugar de procesos volcánicos menores.
Conclusiones:
- La composición isotópica de zinc de las rocas magmáticas lunares proporciona evidencia del agotamiento volátil de la Luna a través de la evaporación.
- Los hallazgos apoyan la hipótesis del impacto gigante para el origen de la Tierra y la Luna.
- Este estudio ofrece información sobre la evolución volátil temprana de los planetas terrestres.
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