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Knickpoints in Martian channels indicate past ocean levels

Duran, Sergio; Coulthard, Tom J.; Baynes, Edwin R C; Baynes, Edwin R.C.

Authors

Sergio Duran

Edwin R C Baynes

Edwin R.C. Baynes



Abstract

On Mars, the presence of extensive networks of sinuous valleys and large channels provides evidence for a wetter and warmer environment where liquid water was more abundant than it is at present. We undertook an analysis of all major channel systems on Mars and detected sharp changes in elevation along the river long profiles associated with steep headwall theatre-like valleys and terraces left downstream by channel incision. These breaks in channel longitudinal slope, headwalls and terraces exhibit a striking resemblance with terrestrial fluvial features, commonly termed 'knickpoints'. On Earth, such knickpoints can be formed by more resistant bedrock or where changes in channel base-level have initiated erosion that migrates upstream (such as tectonic uplift or sea level change). We observed common elevations of Martian knickpoints in eleven separate channel systems draining into the Martian Northern lowlands. Numerical modeling showed that the common elevations of some of these knickpoints were not random. As the knickpoints are spread across the planet, we suggest that these Martian knickpoints were formed in response to a common base level or ocean level rather than local lithology. Thus, they potentially represent a record of past ocean levels and channel activity on Mars.

Journal Article Type Article
Publication Date Oct 22, 2019
Journal Scientific reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
Article Number 15153
APA6 Citation Baynes, E. R., Duran, S., Coulthard, T. J., & Baynes, E. R. C. (2019). Knickpoints in Martian channels indicate past ocean levels. Scientific reports, 9(1), https://doi.org/10.1038/s41598-019-51574-2
DOI https://doi.org/10.1038/s41598-019-51574-2
Keywords Geomorphology; Hydrology; Inner planets
Publisher URL https://www.nature.com/articles/s41598-019-51574-2

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