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Una muestra de la cara oculta de la Luna recuperada por Chang'e-6 contiene basalto de 2.830 millones de años
Zexian Cui1, Qing Yang1, Yan-Qiang Zhang1
1State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China.
Science (New York, N.Y.)
|November 15, 2024
Resumen
El Chang
Área de la Ciencia:
- Geología y geoquímica lunares
- Geoquímica de los isótopos
- Ciencias planetarias
Sus antecedentes:
- La geología del lado lejano de la Luna difiere de la del lado cercano, con distintas composiciones rocosas.
- El potasio, los elementos de tierras raras y el fósforo (KREEP) son menos abundantes en el otro lado.
- La cuenca del Polo Sur-Aitken (SPA) es una región clave para estudiar la evolución del lado oculto de la Luna.
Objetivo del estudio:
- Actividad volcánica hasta la fecha en la cuenca lunar del Polo Sur-Aitken utilizando muestras de Chang'e-6.
- Para determinar el origen geoquímico del magma volcánico.
- Para refinar los modelos cronológicos de los cráteres lunares.
Principales métodos:
- Análisis del isótopo plomo-plomo y rubidio-estroncio del basalto lunar.
- Análisis de isótopos de estroncio, neodimio y plomo.
- Integración de datos de edad en la cronología de cráteres lunares.
Principales resultados:
- Se determinó una edad precisa de 2830 (±5) millones de años para el vulcanismo en la cuenca SPA.
- Las firmas isotópicas indican una fuente de magma agotada en elementos incompatibles.
- La fuente de magma contenía mínimo o ningún componente KREEP.
Conclusiones:
- La cuenca SPA experimentó volcanismo hace unos 2.830 millones de años.
- La fuente volcánica era un reservorio único del manto lunar, distinto de las regiones ricas en KREEP.
- Este hallazgo proporciona datos cruciales para comprender la heterogeneidad y la evolución del manto lunar.
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