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PERIGLACIAL PROCESSES IN UTOPIA PLANITIA, EVOLUTION OF SCALLOPED TERRAINS: NEW INSIGHTS FROM HIRISE OBSERVATIONS

Introduction: In the last few years, evidence of Mars being an ice-rich planet has become increasingly abundant. The mid-latitudes of Mars show Earth-like periglacial landforms. These include polygonal networks [1], periglacial debris-flows [2], pingos-like mounds [3] and thermokarst-like scalloped terrains [4]. We have studied the western part of Utopia Planitia (80°-100°E, 40°-47°N) in order to understand the processes that have been acting to produce scalloped terrains and polygonal network. Indeed, scalloped terrains are assumed to be the result of thawing or sublimation of ice-rich regolith [4]. We focused on this region because there are numerous new high-resolution HiRISE images and climatic simulations [5].