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La corteza de la Luna vista desde GRAIL
Mark A Wieczorek1, Gregory A Neumann, Francis Nimmo
1Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Case 7071, Lamarck A, 5, rue Thomas Mann, 75205 Paris Cedex 13, France. wieczor@ipgp.fr
Science (New York, N.Y.)
|December 11, 2012
Resumen
La Luna La Luna es la Luna.
Área de la Ciencia:
- Geología lunar geología lunar.
- La geofísica planetaria es una geofísica planetaria.
Sus antecedentes:
- Suposiciones anteriores sobre la densidad de la corteza de las tierras altas lunares.
- La necesidad de modelos precisos de la corteza terrestre.
Objetivo del estudio:
- Para determinar la densidad y porosidad de la corteza de las tierras altas de la Luna.
- Para correlacionar las variaciones de porosidad y densidad con las características geológicas y la composición.
- Desarrollar un modelo global de espesor de la corteza terrestre.
Principales métodos:
- Análisis de los datos de alta resolución de la gravedad de la nave espacial GRAIL (Gravity Recovery and Interior Laboratory). análisis de los datos de alta resolución de la gravedad de la nave espacial GRAIL (Gravity Recovery and Interior Laboratory).
- Integración de teledetección y datos de muestras lunares.
- Comparación con las restricciones sísmicas de Apolo.
Principales resultados:
- La densidad masiva de la corteza de las tierras altas de la Luna es de 2550 kg/m3, menor de lo que se suponía anteriormente.
- Esto implica una porosidad cortical promedio del 12% a varios kilómetros de profundidad.
- La porosidad se correlaciona con las cuencas de impacto; la densidad se correlaciona con la composición.
- Un modelo de espesor de la corteza global (3443 km) es consistente con estos hallazgos.
Conclusiones:
- La corteza de las tierras altas de la Luna es significativamente más porosa de lo que se pensaba anteriormente.
- La baja densidad de la corteza apoya un modelo de espesor global y sugiere que la composición lunar no está necesariamente enriquecida en elementos refractarios en comparación con la Tierra.
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