Shallow Fluvial valleys on Alba Patera, Mars from HRSC/MEX analysis: Limited snowmelt episode

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The distribution of valley networks on whole Alba Patera and their pattern suggest that they formed by runoff controlled by topographic slope and lithology. However, 3D characteristics of valleys do not suggest a sustained fluvial activity unlike what we could derive by their 2D properties such as the high drainage density. Episodic snowmelt following snow deposition could be at the origin of these shallow valleys. Melting can be due either to the volcano geothermal activity (valleys possibly formed coevally to volcanic activity), or to transient climatic episodes during the Late Hesperian/Early Amazonian periods that may have been recorded in other locations on Mars. Relationships with ice-rich mantling and age of valleys are not consistent with a melting of this mantling deposited during periods of high obliquity [7] in the recent history of Mars [8]. EPSC Abstracts Vol. 6, EPSC-DPS2011-1742, 2011 EPSC-DPS Joint Meeting 2011 c Author(s) 2011

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