Aqueous alteration in liquid CO2 (M. Hecht, 12/10/2025)

Описание: Full title: Aqueous alteration in liquid CO2 -- it happens on Earth, could it have happened on Mars?


Abstract: Two liquids were plausible on early Mars, water and liquid CO2 (LCO2), though both pose challenges to climate models. Water needs higher temperature than we would expect (>273K), while CO2 needs higher pressure than we would expect (>5.18 bar). Nonetheless, the overwhelming geochemical and morphological evidence for water has made it a central premise of our understanding of present-day Mars. This talk asks whether similar things can be said for LCO2. Morphological arguments to that effect have been made in the past, but we now understand from studies in the carbon sequestration field that LCO2 can also provide a potent pathway to aqueous alteration.

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