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Evolución de la cuenca de impacto de Rembrandt en el mercurio
Thomas R Watters1, James W Head, Sean C Solomon
1Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA. watterst@si.edu
Science (New York, N.Y.)
|May 2, 2009
Resumen
El Mensajero de Dios.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- El cráter de impacto es el cráter de impacto.
Sus antecedentes:
- Mercurio posee numerosos cráteres de impacto, lo que indica una larga historia de bombardeos.
- Las grandes cuencas de impacto proporcionan información sobre la evolución térmica del planeta y los procesos geológicos.
Objetivo del estudio:
- Para caracterizar la cuenca de Rembrandt, la segunda mayor estructura de impacto bien conservada de Mercurio.
- Para analizar el llenado, la deformación y la relación de la cuenca con la evolución global de Mercurio.
Principales métodos:
- Análisis de imágenes de alta resolución y datos del segundo sobrevuelo de Mercurio de MESSENGER.
- Análisis estratigráfico para determinar la secuencia de eventos de relleno y deformación.
- Cartografía geológica de las características radiales de cuenca y las características concéntricas de cuenca.
Principales resultados:
- Descubrimiento y caracterización de la cuenca de Rembrandt de 715 km de diámetro.
- Identificación de un patrón único de "rueda y radios" de crestas de arrugas y graben.
- Evidencia de relleno y deformación en múltiples etapas, incluidas las llanuras volcánicas.
- Observación de una escarpa lobada de aproximadamente 1000 km de largo como el rasgo de deformación más joven.
Conclusiones:
- La cuenca de Rembrandt ofrece una ventana única a la compleja historia geológica de Mercurio.
- Sus características proporcionan evidencia tanto para la contracción interna como para los procesos de impacto externo.
- La evolución de la cuenca está relacionada con el enfriamiento global y la contracción de Mercurio.
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