Analysis of crater valleys, Noachis Terra, Mars: Evidence of fluvial and glacial processes

摘要: Abstract The precise mechanism for the formation and evolution of crater valley networks in Martian southern highlands remains under debate, with precipitation, groundwater flow, melting induced by impact being suggested. We studied within four craters Noachis Terra that were representative similar features where orbital data existed analysis order to characterise their morphology infer possible processes involved evolution. found evidence valleys carved liquid water ice-related processes. This included strong water-based through ice-rich deposits throughout our study area, suggesting an alternative previously suggested rainfall or groundwater-based scenarios. location these on steeply sloping walls, as opposed shallow slopes are typically found, ‘fluvial’ had not evolved a more structured fluvial plains. Our valleys' association material abundant erosion caused downslope flow consistent cold, wet Mars hypothesis accumulation, ice have been dominant factors eroding valleys. Additionally, slope aspect greater dependence local geology presence volatiles than larger networks, though consistently wider length assessed carved. conditions such climate, geology, availability played major role at site.