The Timing of Alluvial Fan Formation on Mars
Open Access
- 1 October 2021
- journal article
- research article
- Published by American Astronomical Society in The Planetary Science Journal
- Vol. 2 (5), 210
- https://doi.org/10.3847/psj/ac25ed
Abstract
The history of rivers on Mars is an important constraint on Martian climate evolution. The timing of relatively young, alluvial fan-forming rivers is especially important, as Mars's Amazonian atmosphere is thought to have been too thin to consistently support surface liquid water. Previous regional studies suggested that alluvial fans formed primarily between the Early Hesperian and the Early Amazonian. In this study, we describe how a combination of a global impact crater database, a global geologic map, a global alluvial fan database, and statistical models can be used to estimate the timing of alluvial fan formation across Mars. Using our global approach and improved statistical modeling, we find that alluvial fan formation likely persisted into the last similar to 2.5 Gyr, well into the Amazonian period. However, the data we analyzed were insufficient to place constraints on the duration of alluvial fan formation. Going forward, more crater data will enable tighter constraints on the parameters estimated in our models and thus further inform our understanding of Mars's climate evolution.Funding Information
- National Aeronautics and Space Administration (NNX16AJ38G)
- National Aeronautics and Space Administration (NNX15AM49G)
- National Aeronautics and Space Administration (80NSSC20K0144)
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