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Evidencia cronológica de que la Luna es joven o no tuvo un océano de magma global
Lars E Borg1, James N Connelly, Maud Boyet
1Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue L-231, Livermore, California 94550, USA. borg5@llnl.gov
Nature
|August 19, 2011
Resumen
Las rocas más antiguas de la corteza lunar, las anortositas ferrosas (FAN), pueden no ser de un océano de magma primordial. La nueva datación isotópica sugiere una edad de cristalización sorprendentemente joven, desafiando las teorías existentes de formación lunar.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geoquímica es la geoquímica.
- Geocronología de isótopos Geocronología de isótopos.
Sus antecedentes:
- Se teoriza que la diferenciación planetaria, incluida la de la Luna, comienza con la solidificación del océano de magma.
- Las anortositas ferroanas (FAN) se consideran rocas primarias de la corteza lunar, formadas durante la última etapa de la cristalización del océano de magma.
- Los intentos anteriores de fechar las FAN han dado resultados ambiguos debido a las incompatibilidades isotópicas.
Objetivo del estudio:
- Para determinar con precisión la edad de cristalización de la anortosita ferrosa (FAN) 60025.
- Para reevaluar la hipótesis del océano de magma prevaleciente para la formación de la corteza lunar.
Principales métodos:
- Se utilizaron técnicas isotópicas mejoradas para la determinación precisa de la edad.
- Los sistemas isotópicos aplicados (207) Pb-(206) Pb, (147) Sm-(143) Nd y (146) Sm-(142) Nd.
Principales resultados:
- Se determinó que la edad de cristalización de FAN 60025 es de 4.360 ± 3 millones de años.
- Esta edad es significativamente más joven de lo estimado previamente para las rocas primarias de la corteza lunar.
Conclusiones:
- La joven edad desafía la suposición de larga data de que las FAN son acumulados de flotación de un océano de magma lunar primordial.
- Modelos alternativos, como el magmatismo en serie, pueden ser responsables de gran parte de la corteza lunar.
- Este hallazgo requiere una revisión de las líneas de tiempo de formación y evolución lunar.
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