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Mineral alteration in water-saturated liquid CO2 on early Mars

Abstract

Geomorphological and mineralogical evidence is consistent with aqueous activity on ancient Mars, yet explaining the presence of substantial liquid water on early Mars remains challenging. Another fluid, liquid CO2, was probably present during Martian history, at least in the subsurface, and could even have been stable at the surface under a sufficiently dense CO2-rich early atmosphere. Liquid CO2 flows have been proposed as an alternative to water to explain morphological features, but it is widely accepted that water is the fluid responsible for mineral alteration. Interestingly, however, experimental research on geologic sequestration on Earth has revealed a surprising degree of chemical reactivity between CO2 fluid and minerals if the fluid is water-saturated, as it would probably have been on Mars. The resulting alteration products — carbonates, phyllosilicates and possibly sulfates — are consistent with minerals found on Mars today. We therefore propose that the formation of some of the aqueous mineral alteration observed on the Martian surface may have been mediated by liquid CO2. Further laboratory investigations are needed to test this hypothesis.

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Fig. 1: Accelerated carbonate formation rates in water-saturated LCO2 compared to water alone.
Fig. 2: The phase diagram of CO2 constrains the minimum partial pressure \(p_{{\mathrm{CO}}_2}\) in both the present day and on early Mars.

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Acknowledgements

A portion of this work was conducted at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004).

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Contributions

M.H.H. conceived the study and led the writing effort. Specific author contributions include S. Krevor to the sequestration literature review, I.B.S. to the LCO2 scenario thermophysics, M.M. to the early climate considerations, M.C. and M.S. to the relevance to astrobiology and organics preservation, S. Kounaves to the geochemical considerations, A.S.Y. and D.F. to establishing the relevance to Martian mineralogy, N.R. to the writing and analysis, J.W.R. to implications for Martian geomorphology, and M.F. to understanding Martian volatile evolution. A.S., A.J.B. and several other authors contributed to writing and review of the manuscript.

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Correspondence to Michael H. Hecht.

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Nature Geoscience thanks Paul Niles and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor: Tamara Goldin, in collaboration with the Nature Geoscience team.

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Hecht, M.H., Krevor, S., Yen, A.S. et al. Mineral alteration in water-saturated liquid CO2 on early Mars. Nat. Geosci. 17, 1204–1208 (2024). https://doi.org/10.1038/s41561-024-01576-1

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