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Depositos del polo norte de Marte: estratigrafía, edad y respuesta geodinámica
Roger J Phillips1, Maria T Zuber, Suzanne E Smrekar
1Southwest Research Institute, Boulder, CO 80302, USA. roger@boulder.swri.edu
Science (New York, N.Y.)
|May 17, 2008
Resumen
Marte Marte es el planeta Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
- Radar de detección remota de radar.
Sus antecedentes:
- Los depósitos en capas del polo norte de Marte contienen pistas cruciales sobre la historia climática del planeta.
- Comprender la estructura del subsuelo es clave para descifrar las condiciones ambientales del pasado.
Objetivo del estudio:
- Para investigar la estratigrafía interna de los depósitos en capas del polo norte de Marte utilizando datos de radar.
- Para inferir los procesos geológicos y las propiedades litosféricas de Marte.
Principales métodos:
- Utilizando datos del instrumento de radar de poca profundidad (SHARAD) a bordo del orbitador de reconocimiento de Marte.
- Analizar los reflejos de radar para identificar las capas y las características estructurales dentro de los depósitos.
Principales resultados:
- SHARAD reveló capas laterales continuas compuestas por distintos paquetes de reflectores separados por regiones ricas en hielo.
- La estratigrafía observada sugiere ciclos de deposición vinculados a variaciones orbitales (oblicuidad o excentricidad) en escalas de tiempo de millones de años.
- El análisis de la deflexión del sustrato indica un espesor de la litosfera superior a 300 km o un estado reológico transitorio.
Conclusiones:
- Los depósitos en capas registran ciclos climáticos a largo plazo en Marte.
- El espesor litosférico inferido y la viscosidad potencial del manto apuntan a modelos específicos de evolución térmica para Marte.
- Marte probablemente posee una abundancia subcondrítica de elementos que producen calor.
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