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La evidencia de precipitación en Marte proviene de valles dendríticos en el área de Valles Marineris
Nicolas Mangold1, Cathy Quantin, Véronique Ansan
1Laboratoire IDES, UMR CNRS and Université Paris-Sud, Orsay Campus, 91405 Orsay, France. mangold@geol.u-psud.fr
Science (New York, N.Y.)
|July 3, 2004
Resumen
Marte Marte es el planeta Marte.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Geología Geología Geología.
- Hidrología Hidrología Hidrología.
Sus antecedentes:
- Los valles y cañones dendríticos en la región de Valles Marineris de Marte presentan características geológicas únicas.
- La comprensión previa sugería que Marte era frío durante el período tardío de Hesperio.
Objetivo del estudio:
- Para analizar las características geomórficas de los valles marcianos.
- Determinar los mecanismos de formación y la edad de las formas de relieve fluviales en Valles Marineris.
Principales métodos:
- Imágenes del Sistema de Imágenes de Emisión Térmica Utilizada (THEMIS) de la nave espacial Mars Odyssey.
- Características geomórficas analizadas, incluidas las ramificaciones del valle y los canales internos.
Principales resultados:
- Se han identificado valles dendríticos con altos grados de ramificación, indicativos de precipitación atmosférica.
- Se observaron redes maduras y ramificadas y canales internos que sugieren un flujo de fluidos sostenido.
- Dató estas formas de relieve fluviales a la época tardía de Hesperio (hace 2.9-3.4 mil millones de años).
Conclusiones:
- La geomorfología sugiere la formación por precipitación y actividad hidrológica sostenida.
- Estos hallazgos indican condiciones más cálidas y húmedas en Marte durante el Hesperiano Tardío de lo que se pensaba anteriormente.
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