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Reull Vallis - Evolution of a Fluvial System in Eastern Hellas Region, Mars

Introduction: The eastern Hellas region has been characterized and modified by apparent volatile rich activity. Still, the scales of these processes, their exact places in local geologic history, and even their forms are still very debatable [cfg., 1 and references therein]. In eastern Hellas, as also elsewhere on Mars, the large channels stand out and have been subject to extensive studies [e.g., 2-8]. One of the channels, Reull Vallis, begins in Hesperia Planum and runs from east to west across the Promethei Terra. We present a hypothesis for the evolution of Reull and its complimentary fluvial system. We suggest that this system consists of several parts that were formed during several distinct phases. Data and methods: We defined and analyzed the different parts of the fluvial system and correlated temporally the processes that led to their formation using available images and topographic data (VO MDIMs, MGS MOC, MO THEMIS (IR and VIS), MEX HRSC, and MGS MOLA-gridded topography (128 px/deg)). Crater counting served to derive relative and to model the absolute ages of different portions of the Reull Vallis system; measurements from MDIM and MOLA were used to estimate volumes and their balances for different parts of the system.