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    Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water

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    Dundas_etal_GranularRSL_v17_fi ...
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    Description:
    Final Accepted Manuscript
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    GranularRSL_SOM_final.pdf
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    Supplemental File
    Citation
    Dundas, C. M., McEwen, A. S., Chojnacki, M., Milazzo, M. P., Byrne, S., McElwaine, J. N., & Urso, A. (2017). Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water. Nature Geoscience, 10(12), 903.
    Rights
    Copyright © 2017, Springer Nature.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae - seasonal flows that are darker than their surroundings - are candidate locations for seeping liquid water on Mars today, but their formation mechanism remains unclear. Topographical analysis shows that the terminal slopes of recurring slope lineae match the stopping angle for granular flows of cohesionless sand in active Martian aeolian dunes. In Eos Chasma, linea lengths vary widely and are longer where there are more extensive angle-of-repose slopes, inconsistent with models for water sources. These observations suggest that recurring slope lineae are granular flows. The preference for warm seasons and the detection of hydrated salts are consistent with some role for water in their initiation. However, liquid water volumes may be small or zero, alleviating planetary protection concerns about habitable environments.
    Note
    6 month embargo; published online: 20 November 2017
    ISSN
    1752-0894
    1752-0908
    Version
    Final accepted manuscript
    Sponsors
    MRO project; NASA [NNX13AK01G, NNX14AO21G]
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41561-017-0012-5
    Scopus Count

    entitlement

     

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