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Volcanismo rico en KREEP de 2.2 mil millones de años en la Luna
Mu-Han Yang1, Qian W L Zhang2, Qiu-Li Li1
1State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Science bulletin
|September 3, 2025
Resumen
El meteorito lunar más joven revela un prolongado magmatismo KREEP (potasio, elementos de tierras raras, fósforo), que extiende su duración en 800 millones de años. Esto sugiere que los procesos episódicos del manto alimentaron el volcanismo lunar en etapa tardía.
Área de la Ciencia:
- Geología lunar
- Geoquímica de los isótopos
- Ciencias planetarias
Sus antecedentes:
- El componente KREEP de la Luna es una fuente de calor clave para el volcanismo.
- Los datos de la misión Chang'e pusieron en duda el papel de KREEP en la última etapa del volcanismo.
Objetivo del estudio:
- Investigar la duración y la fuente del magmatismo lunar relacionado con KREEP.
- Analice el meteorito lunar más joven conocido para entender el volcanismo en etapa tardía.
Principales métodos:
- Análisis geoquímico y geocronológico del meteorito lunar NWA 16286.
- Compilación y análisis de datos isotópicos de basaltos lunares.
Principales resultados:
- NWA 16286, fechado hace 2201 ± 13 millones de años, muestra una fuente de manto rica en KREEP.
- Esto extiende el magmatismo relacionado con KREEP en ~ 800 millones de años.
- Los basaltos lunares exhiben tres episodios volcánicos con un aumento de los isótopos de U/Pb y una disminución de Nd, lo que indica la convección del manto.
Conclusiones:
- El volcado episódico del manto o el surgimiento impulsado por plumas desencadenó el volcanismo lunar.
- Los componentes de KREEP se incorporaron cada vez más a las fuentes de basalto durante los episodios volcánicos más jóvenes.
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