Absolute dune ages and implications for the time of formation of gullies in Nirgal Vallis, Mars

Details Absolute dune ages and implications for the time of formation of gullies in Nirgal Vallis, Mars Absolute dune ages and implications for the time of formation of gullies in Nirgal Vallis, Mars

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgre..10906007r&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue E6, CiteID E06007

Physics

29

Planetology: Solid Surface Planets: Impact Phenomena (Includes Cratering), Planetology: Solid Surface Planets: Surface Materials And Properties, Planetology: Solid Surface Planets: Erosion And Weathering, Planetology: Solid Surface Planets: Atmospheres-Evolution

Scientific paper

Transverse dunes cover the valley floor of Nirgal Vallis, a 670 km long valley network at 318°E and 29°S. The dunes are superposed by small undeformed impact craters, which implies that the dunes are inactive under present atmospheric conditions. The last active phase of dune movement (absolute age) can be determined by crater size frequency distributions. The derived absolute ages from high-resolution Mars Global Surveyor Mars Orbiter Camera imagery range from approximately 300,000 years to 1.4 Myr B.P. (error of factor of 2). The dunes are also superposed by gully deposits (aprons), which implies a younger age of the gullies. These superposition relationships show that the gullies in this midlatitude region are at the most 3 Myr old but might be even younger than 300,000 years.

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