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Restricciones isotópicas y de composición en la fuente de basalto recolectado en la cara oculta de la Luna

Xiaochao Che^1,2, Tao Long^1,2, Alexander Nemchin^1,3

¹Beijing Sensitive High Resolution Ion Micro Probe Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China.

Science (New York, N.Y.)

|February 27, 2025

Resumen

La misión Chang'e-6 analizó los basaltos lunares de la cuenca del Polo Sur-Aitken. Estos basaltos sugieren una etapa tardía de cristalización del océano de magma lunar (LMO) y una posible modificación del manto por el impacto del SPA.

Área de la Ciencia:

Geología lunar y vulcanismo
Ciencias planetarias
Geocronología

Sus antecedentes:

El vulcanismo lunar creó depósitos de basalto cruciales para comprender los procesos internos de la Luna.
La misión Chang'e-6 recuperó con éxito muestras del lado lejano de la Luna, la cuenca del Polo Sur-Aitken (SPA).

Objetivo del estudio:

Para analizar la composición y la edad de los fragmentos de basalto de la misión Chang'e-6.
Investigar las implicaciones de estos basaltos para los procesos interiores lunares y el modelo de océano de magma lunar (LMO).

Principales métodos:

Análisis de los fragmentos de basalto recogidos por la misión Chang'e-6.
Datamiento con uranio-plomo (U-Pb) para determinar la edad del basalto y las características de la fuente.

Principales resultados:

Los basaltos Chang'e-6 son composicionalmente similares a los basaltos Apollo con bajo contenido de titanio.
La datación U-Pb dio una edad de basalto de 2823,0 ± 5,9 millones de años.
Una fuente alta de U/Pb de 480 ± 56 sugiere una etapa tardía de cristalización de LMO.

Conclusiones:

Los hallazgos apoyan el modelo de océano de magma lunar (LMO), pero muestran una desviación de las tendencias de la muestra de Apolo.
Los datos de basalto de Chang'e-6 sugieren una modificación del manto posterior a LMO, potencialmente vinculada al impacto de la SPA.

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