Transport processes induced by metastable boiling water under Martian surface conditions

M. Massé, S. J. Conway, J. Gargani, M. R. Patel, K. Pasquon, A. McEwen, S. Carpy, V. Chevrier, M. R. Balme, L. Ojha, M. Vincendon, F. Poulet, F. Costard, G. Jouannic

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Abstract

Liquid water may exist on the Martian surface today, albeit transiently and in a metastable state under the low atmospheric surface pressure. However, the identification of liquid water on Mars from observed morphological changes is hampered by our limited understanding of how metastable liquids interact with sediments. Here, we present lab experiments in which a block of ice melts and seeps into underlying sediment, and the resulting downslope fluid propagation and sediment transport are tracked. In experiments at Martian surface pressure, we find that pure water boils as it percolates into the sediment, inducing grain saltation and leading to wholesale slope destabilization: a hybrid flow mechanism involving both wet and dry processes. For metastable brines, which are more stable under Martian conditions than pure water, saltation intensity and geomorphological impact are reduced; however, we observed channel formation in some briny flow experiments that may be analogous to morphologies observed on Mars. In contrast, under terrestrial-like experimental conditions, there is little morphological impact of seeping water or brine, which are both stable. We propose that the hybrid flow mechanism operating in our experiments under Martian surface pressure could explain observed Martian surface changes that were originally interpreted as the products of either dry or wet processes.

Original languageEnglish (US)
Pages (from-to)425-428
Number of pages4
JournalNature Geoscience
Volume9
Issue number6
DOIs
StatePublished - Jun 1 2016

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ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Massé, M., Conway, S. J., Gargani, J., Patel, M. R., Pasquon, K., McEwen, A., Carpy, S., Chevrier, V., Balme, M. R., Ojha, L., Vincendon, M., Poulet, F., Costard, F., & Jouannic, G. (2016). Transport processes induced by metastable boiling water under Martian surface conditions. Nature Geoscience, 9(6), 425-428. https://doi.org/10.1038/ngeo2706