Abstract
By the time eukaryotic life or photosynthesis evolved on Earth, the martian surface had become extremely inhospitable, but the subsurface of Mars could potentially have contained a vast microbial biosphere. Crustal fluids may have welled up from the subsurface to alter and cement surface sediments, potentially preserving clues to subsurface habitability. Here we present a conceptual model of subsurface habitability of Mars and evaluate evidence for groundwater upwelling in deep basins. Many ancient, deep basins lack evidence for groundwater activity. However, McLaughlin Crater, one of the deepest craters on Mars, contains evidence for Mg–Fe-bearing clays and carbonates that probably formed in an alkaline, groundwater-fed lacustrine setting. This environment strongly contrasts with the acidic, water-limited environments implied by the presence of sulphate deposits that have previously been suggested to form owing to groundwater upwelling. Deposits formed as a result of groundwater upwelling on Mars, such as those in McLaughlin Crater, could preserve critical evidence of a deep biosphere on Mars. We suggest that groundwater upwelling on Mars may have occurred sporadically on local scales, rather than at regional or global scales.
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Acknowledgements
We thank S. Clifford and K. Lewis for comments that greatly improved the manuscript. We acknowledge NASA’s Mars Data Analysis Program and the European Commission Marie Curie Actions for funding of various portions of this research.
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J.R.M. conceived of project, processed most of the data, and wrote most of the manuscript. J.P., P.B.N. and J.C. wrote portions of the paper. A.D.R. contributed analyses of the thermal infrared data and S.P.W. contributed analyses of impact deposits.
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Michalski, J., Cuadros, J., Niles, P. et al. Groundwater activity on Mars and implications for a deep biosphere. Nature Geosci 6, 133–138 (2013). https://doi.org/10.1038/ngeo1706
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DOI: https://doi.org/10.1038/ngeo1706
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