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Geochemical Consequences of Widespread Clay Mineral Formation in Mars' Ancient Crust

Ehlmann, Bethany L.; Mangold, Nicolas; Chassefière, Eric +7 more

Clays form on Earth by near-surface weathering, precipitation in water bodies within basins, hydrothermal alteration (volcanic- or impact-induced), diagenesis, metamorphism, and magmatic precipitation. Diverse clay minerals have been detected from orbital investigation of terrains on Mars and are globally distributed, indicating geographically wid…

Quantitative Assessments of the Martian Hydrosphere

Mangold, Nicolas; Mousis, Olivier; Hauber, Ernst +6 more

In this paper, we review current estimates of the global water inventory of Mars, potential loss mechanisms, the thermophysical characteristics of the different reservoirs that water may be currently stored in, and assess how the planet's hydrosphere and cryosphere evolved with time. First, we summarize the water inventory quantified from geologic…