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The Kasei Valles, Mars: a unified record of episodic channel flows and ancient ocean levels

Duran, Sergio; Coulthard, Tom J.

Authors

Sergio Duran



Abstract

There is widespread evidence across Mars of past flows in major channel systems as well as more than one palaeo ocean level. However, evidence for the timing of channel flows and ocean levels is based on geographically diverse sources with a limited number of dates, making reconstructions of palaeo flows and ocean levels patchy. Here, based on high-resolution topography, image analysis and crater statistics, we have dated 35 different surfaces in Kasei Valles, that are predominantly found within erosional units enabling us to reconstruct a fascinating timeline of episodic flooding events (ranging from 3.7 to 3.6 Ga to ca. 2.0 Ga) interacting with changing ocean/base levels. The temporal correlation of the different surfaces indicates five periods of channel flows driving the evolution of Kasei Valles, in conjunction with the development of (at least) two ocean levels. Furthermore, our results imply that such ocean rose in elevation (ca. 1000 m) between ca. 3.6 Ga and 3.2 Ga and soon afterwards disappeared, thereby indicating a complex ancient Martian hydrosphere capable of supporting a vast ocean, with an active hydrological cycle stretching into the Amazonian.

Citation

Duran, S., & Coulthard, T. J. (2020). The Kasei Valles, Mars: a unified record of episodic channel flows and ancient ocean levels. Scientific reports, 10(1), https://doi.org/10.1038/s41598-020-75080-y

Journal Article Type Article
Acceptance Date Sep 30, 2020
Online Publication Date Oct 29, 2020
Publication Date 2020-12
Deposit Date Nov 2, 2020
Publicly Available Date Nov 2, 2020
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Article Number 18571
DOI https://doi.org/10.1038/s41598-020-75080-y
Keywords Geomorphology; Hydrology; Inner planets
Public URL https://hull-repository.worktribe.com/output/3651389
Publisher URL https://www.nature.com/articles/s41598-020-75080-y
Additional Information Received: 16 January 2020; Accepted: 30 September 2020; First Online: 29 October 2020; : The authors declare no competing interests.

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https://creativecommons.org/licenses/by/4.0/

Copyright Statement
© The Author(s) 2020
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.





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