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La convection des fluides dans le sol de Mars et les échanges induits avec l'atmosphère et la paléo-hydrosphère de la planète

Abstract : Mars' geological record, with objects reflecting its internal activity and surface-atmosphere exchanges, extends for more than 4 Ga. It offers a unique situation for understanding planetary evolution. The topic of this thesis is the circulation of fluids in the crust, making part of these exchanges. First, the paradigm that condensation, sublimation and diffusion of volatiles within the regolith dominate the cold and dry Amazonian era (<3 Ga) is modified by the finding of the importance of air convection in porous soils (aerothermalism). This process was revealed from thermal imagery (Mars Odyssey/THEMIS) and morphology (e.g., Mars Express/HRSC) for Cerberus Fossae, and Arsia volcano. Second, the Hesperian era is characterised by the formation of chaotic terrains and outflow channels carved by massive release of water. In our views, the chaotic terrains may be formed by convection of clay deposits. This original hypothesis is supported by associated detections of phyllosilicates (CRISM and OMEGA data).
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https://tel.archives-ouvertes.fr/tel-00608618
Contributor : Williams Exbrayat <>
Submitted on : Wednesday, July 13, 2011 - 3:34:38 PM
Last modification on : Thursday, October 15, 2020 - 4:07:17 AM
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Téodolina Lopez Gonzalez. La convection des fluides dans le sol de Mars et les échanges induits avec l'atmosphère et la paléo-hydrosphère de la planète. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2011. Français. ⟨tel-00608618⟩

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