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Hydratation de la surface de Mars à partir des données du rover Curiosity

Abstract : The search for hydrated phases lying at the surface of Mars is essential to understand its habitable past and the fate of water on a planet disrupted by global climate changes. The MSL/Curiosity rover provides new tools to characterize surface hydration in situ. Among these, laser induced breakdown spectroscopy (LIBS) performed by the ChemCam instrument enables remote measurement of elementary abundance. However, measuring the LIBS emission peak of hydrogen at 656.6 nm (Balmer alpha) to quantify target water content is poorly documented in the literature. Using the instrument replica, large series of hydrated samples have been analyzed in the laboratory under Martian atmospheric conditions. Except for some samples on which effects specific to the hydrogen signal have been observed, these tests show that a linear calibration can be obtained with target water content. On Mars, at Gale crater, this calibration reveals the hydration of different phases: bassanite (CaSO4 × 0.5H2O) in the veins filling the bedrock fractures, magnesium sulfates, opaline and clay rich sediments discovered in situ. Measurement of water content performed to date have been limited to sparse and bulk pyrolysis experiments; this study shows that ChemCam provides a new technique to measurement hydrogen on the surface, at a submillimeter scale and sampling a very large number of rocks.
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https://tel.archives-ouvertes.fr/tel-01462123
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Submitted on : Wednesday, February 8, 2017 - 4:37:14 PM
Last modification on : Wednesday, April 8, 2020 - 1:49:30 AM

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  • HAL Id : tel-01462123, version 1

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William Rapin. Hydratation de la surface de Mars à partir des données du rover Curiosity . Planétologie. Université Toulouse 3 Paul Sabatier (UT3 Paul Sabatier), 2016. Français. ⟨tel-01462123⟩

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