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El núcleo interno sólido lunar y el revés del manto

Arthur Briaud1, Clément Ganino2, Agnès Fienga3,4

  • 1Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Géoazur, Valbonne, France. briaud@geoazur.unice.fr.

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Los científicos encontraron evidencia del núcleo interno sólido de la Luna y un vuelco del manto global. Este descubrimiento proporciona información sobre la historia temprana de la Luna y su evolución.

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Área de la Ciencia:

  • * Ciencias planetarias
  • * Geofísica
  • * Sismología

Sus antecedentes:

  • * Los datos sismológicos de Apolo revelaron la estructura interna lunar, observando que la velocidad de las ondas sísmicas disminuye en el límite núcleo-manto.
  • Los estudios anteriores carecían de la resolución para confirmar un núcleo interno lunar sólido o comprender completamente el vuelco del manto lunar.
  • La dinámica interna de la Luna y su historia temprana siguen siendo temas de discusión científica en curso.

Objetivo del estudio:

  • * Para investigar la estructura interna de la Luna, específicamente la existencia de un núcleo interno y el escenario de volcado del manto.
  • * Conciliar los datos geofísicos y geodésicos con las restricciones termodinámicas para los modelos del interior lunar.
  • * Para proporcionar una comprensión más definitiva de la formación de la Luna y la evolución temprana.

Principales métodos:

  • * Restricciones geofísicas y geodésicas combinadas.
  • * Utilizó la exploración de Monte Carlo y simulaciones termodinámicas para varias estructuras internas lunares.
  • * Velocidades y densidades de ondas sísmicas analizadas derivadas de datos termodinámicos y deformación de mareas.

Principales resultados:

  • * Modelos identificados con una zona de baja viscosidad enriquecida con ilmenita y un núcleo interno que coincide con las restricciones de densidad de deformación termodinámica y de marea.
  • * Demostró una fuerte evidencia que apoya el escenario de la reversión del manto lunar.
  • * Confirmó la existencia de un núcleo interno lunar con un radio de 258 ± 40 km y una densidad de 7,822 ± 1,615 kg / m3.

Conclusiones:

  • * El estudio proporciona fuertes indicios de un cambio global del manto lunar.
  • * Se demuestra la existencia del núcleo interno lunar, lo que afecta nuestra comprensión de la evolución del campo magnético de la Luna.
  • Estos hallazgos ofrecen una visión significativa de la línea de tiempo del bombardeo lunar en los primeros mil millones de años del Sistema Solar.