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Rapid megaflood-triggered base-level rise on Mars

Ahmed, Joshua; Peakall, Jeffrey; Balme, Matthew; Parsons, Daniel

Authors

Jeffrey Peakall

Matthew Balme

Daniel Parsons



Abstract

The existence of ancient fluvial systems on Mars is widely-accepted, but little is known about how quickly they formed, or what environmental conditions controlled their evolution. We analyzed a sequence of well-preserved inner-bank bar deposits within the meander bends of a multi-stacked sinuous fluvial ridge in Aeolis Dorsa, and compared them to similar features on Earth to establish the conditions required for their formation. Our results reveal that these Martian channels were highly aggradational, rising an order of magnitude higher than terrestrial rivers. This evolution occurred over very rapid timescales, with our estimates suggesting that some entire inner-bar set deposits, and therefore the aggradational channel, may have formed in less than a year, with upper bounds of a few decades. We suggest that this unique channel topography was created by a rapidly-rising downstream water body, triggered by a sequence of externally sourced megafloods (e.g., crater lake breaches).

Citation

Ahmed, J., Peakall, J., Balme, M., & Parsons, D. (2022). Rapid megaflood-triggered base-level rise on Mars. Geology, https://doi.org/10.1130/G50277.1

Journal Article Type Article
Acceptance Date Aug 12, 2022
Online Publication Date Nov 4, 2022
Publication Date Nov 4, 2022
Deposit Date Nov 6, 2022
Publicly Available Date Nov 7, 2022
Journal Geology
Print ISSN 0091-7613
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1130/G50277.1
Keywords Mars, Planetary science, sedimentology, geomorphology, fluvial geomorphology
Public URL https://hull-repository.worktribe.com/output/4051661
Publisher URL https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G50277.1/618748/Rapid-megaflood-triggered-base-level-rise-on-Mars

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