Geomorphic characteristics for Amazonian dike swarms emplaced in Utopia basin, Mars

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Scientific paper

Abstract Hundreds of narrow, linear ridge segments are found in the transition zone between Elysium Rise and Utopia basin. Five multiple ridge systems are identified having lengths ranging from 15-45km and being between 1-7 km wide, while the length of single ridges approximately are 30km and vary between 100-400m wide. The linear ridges are interpreted to be dikes and the multiple ridge systems are interpreted to be dike swarms. The finding of yardangs and different stages of inverted craters indicate that erosion of units has taken place in the area making it feasible that normal dikes have been exposed. However, evidence for möberg ridges has been reported within the area making subglacial intrusions plausible, too. The dikes are both modifying and constraining Early Amazonian flows suggesting intense dike emplacement in the transition zone between Utopia Basin and Elysium Rise in the Early Amazonian.

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