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La evolución de la corteza de Mercurio: una perspectiva global desde MESSENGER
Brett W Denevi1, Mark S Robinson, Sean C Solomon
1School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85251, USA. bdenevi@ser.asu.edu
Science (New York, N.Y.)
|May 2, 2009
Resumen
La corteza de Mercurio muestra un terreno diverso, con llanuras volcánicas que cubren el 40% de su superficie. Un material azul de baja reflectancia, probablemente de capas más profundas, se encuentra en las eyecciones de impacto, revelando la composición de la corteza y el manto.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- La detección remota de detección remota.
Sus antecedentes:
- Comprender la composición y evolución de la corteza planetaria es crucial para limitar la formación e historia planetaria.
- Las observaciones anteriores de Mercurio proporcionaron una cobertura limitada, lo que impidió un análisis exhaustivo de sus características de superficie.
Objetivo del estudio:
- Mapear la distribución y extensión de los principales tipos de terreno en la superficie de Mercurio.
- Para revelar heterogeneidades laterales y verticales en la composición de la corteza de Mercurio utilizando variaciones de color.
Principales métodos:
- Análisis de datos combinados de las misiones MESSENGER y Mariner 10.
- Análisis espectroscópico de la reflectancia de la superficie para inferir la composición.
Principales resultados:
- Las llanuras lisas, indicativas de la actividad volcánica, cubren aproximadamente el 40% de la superficie de Mercurio.
- Un material distinto de baja reflectividad, de tonos azules, concentrado en las eyecciones de impacto, cubre al menos el 15% de la superficie.
- Las características espectrales sugieren que este material azul se origina en una corteza más profunda o capa superior del manto rica en óxidos de hierro y titanio.
Conclusiones:
- Una porción significativa de la corteza de Mercurio probablemente se originó por procesos volcánicos.
- La presencia y distribución del material azul proporcionan información sobre la estructura y composición interna de Mercurio, lo que sugiere la excavación desde la profundidad.
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