Fluvial Regimes, Morphometry and Age of Jezero Crater Paleolake Inlet Valleys and their Exobiological Significance for the 2020 Rover Mission Landing Site - Université d'Angers Accéder directement au contenu
Article Dans Une Revue Astrobiology Année : 2020

Fluvial Regimes, Morphometry and Age of Jezero Crater Paleolake Inlet Valleys and their Exobiological Significance for the 2020 Rover Mission Landing Site

Résumé

Jezero crater has been selected as the landing site for the Mars 2020 Perseverance rover, because it contains apaleolake with two fan-deltas, inlet and outlet valleys. Using the data from the High Resolution Stereo Camera(HRSC) and the High Resolution Imaging Science Experiment (HiRISE), we conducted a quantitative geomorphological study of the inlet valleys of the Jezero paleolake. Results show that the strongest erosion is related to a network of deep valleys that cut into the highland bedrock well upstream of the Jezero crater and likely formed before the formation of the regional olivine-rich unit. In contrast, the lower sections of valleys display poorbedrock erosion and a lack of tributaries but are characterized by the presence of pristine landforms interpreted asfluvial bars from preserved channels, the discharge rates of which have been estimated at 10^3–10^4 m^3s^-1. The valleys’ lower sections postdate the olivine-rich unit, are linked directly to the fan-deltas, and are thus formed inan energetic, late stage of activity. Although a Late Noachian age for the fan-deltas’ formation is not excludedbased on crosscutting relationships and crater counts, this indicates evidence of a Hesperian age with significantimplications for exobiology.

Domaines

Planétologie
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Dates et versions

hal-02933200 , version 1 (08-09-2020)

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Citer

Nicolas Mangold, Gilles Dromart, V. Ansan, Francesco Salese, Maarten Kleinhans, et al.. Fluvial Regimes, Morphometry and Age of Jezero Crater Paleolake Inlet Valleys and their Exobiological Significance for the 2020 Rover Mission Landing Site. Astrobiology, 2020, 20 (8), pp.994-1013. ⟨10.1089/ast.2019.2132⟩. ⟨hal-02933200⟩
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