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Serpentinisation et carbonatation de la croûte Martienne

Abstract : Over the last 3 billion years liquid water has an extremely limited presence on Mars. However, the multiple data available on the planet show evidences of a significant presence of liquid water from the accretion of the planet until about 3.7 billion years. The prevailing hypothesis today is that Mars had a denser atmosphere (possibly rich in CO2) early in its history. Much of this atmosphere and water were lost in space. Another possibility for reducing the amount of liquid water available and the reduction of the atmosphere is the water storage of water and CO2 in the crust. The Martian crust is studied via CRISM spectro-imaging data to characterize the early hydrothermal alteration of the planet. Serpentine and carbonates of detections confirm that the storage of a portion of the water and the atmosphere of Mars occurred. Additional constraints are provided by the geochemical modeling of serpentinization and carbonation of the Martian crust through EQ3/6 programs. The importance of serpentinization and carbonation of the Martian crust is thus reassessed. The results allow to open the debate on the role of serpentinization and carbonation on the evolution of the liquid water available and the evolution of the atmosphere. In addition, the thermodynamic conditions help provide constraints on the exobiology potential of the Martian crust
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https://tel.archives-ouvertes.fr/tel-01359052
Contributor : Abes Star :  Contact
Submitted on : Thursday, September 1, 2016 - 4:29:07 PM
Last modification on : Tuesday, February 18, 2020 - 3:54:02 PM

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TH2016BultelBenjamin.pdf
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  • HAL Id : tel-01359052, version 1

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Benjamin Bultel. Serpentinisation et carbonatation de la croûte Martienne. Planétologie et astrophysique de la terre [astro-ph.EP]. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSE1004⟩. ⟨tel-01359052⟩

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