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Registro de cráteres de Mercurio visto desde el primer sobrevuelo de MESSENGER
Robert G Strom1, Clark R Chapman, William J Merline
1Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. rstrom@lpl.arizona.edu
Science (New York, N.Y.)
|July 5, 2008
Resumen
Mercurio Mercurio Mercurio Mercurio es Mercurio.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- El cráter de impacto es el cráter de impacto.
Sus antecedentes:
- La misión MESSENGER proporcionó nuevos datos sobre la superficie de Mercurio.
- La comprensión de la historia geológica de Mercurio requiere el análisis de cráteres de impacto.
Objetivo del estudio:
- Para dilucidar la historia geológica de Mercurio utilizando morfologías de cráteres de impacto y distribuciones tamaño-frecuencia.
- Para determinar la edad y el origen de las unidades de llanura en Mercurio.
Principales métodos:
- Análisis de las morfologías de los cráteres de impacto y las distribuciones de tamaño y frecuencia de los datos de sobrevuelo de MESSENGER.
- Comparación de densidades de cráteres y distribuciones de tamaño con datos lunares y marcianos.
Principales resultados:
- Las llanuras interiores de la cuenca de Caloris tienen edades similares.
- Las llanuras lisas exteriores son volcánicas, no eyectas de impacto, y se formaron después de hace 3.800 millones de años.
- Los cráteres secundarios dominan sobre los primarios en diámetros ≤ 810 km en Mercurio.
- La cuenca del anillo de picos Raditladi puede tener menos de mil millones de años.
Conclusiones:
- Las llanuras de Mercurio proporcionan información sobre su historia volcánica y de impacto.
- La prevalencia de cráteres secundarios en Mercurio sugiere un régimen de impacto diferente en comparación con la Luna y Marte.
- La edad de la cuenca de Raditladi indica una actividad geológica en curso.
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