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    The rheological behavior of CO2 ice: application to glacial flow on Mars

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    Date
    2020-10-29
    Author
    Cross, Andrew J.  Concept link
    Goldsby, David L.  Concept link
    Hager, Travis F.  Concept link
    Smith, Isaac B.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/26703
    As published
    https://doi.org/10.1029/2020GL090431
    Related Material/Data
    https://hdl.handle.net/1912/26314
    DOI
    10.1029/2020GL090431
    Keyword
     SPLD; Mars; glacier; carbon dioxide; flow law; creep 
    Abstract
    Vast quantities of solid CO2 reside in topographic basins of the south polar layered deposits (SPLD) on Mars and exhibit morphological features indicative of glacial flow. Previous experimental studies showed that CO2 ice is 1–2 orders of magnitude weaker than water ice under Martian polar conditions. Here we present data from deformation experiments on pure, fine‐grained CO2 ice, over a broader range of temperatures than previously explored (158–213 K). The experiments confirm previous observations of highly nonlinear power law creep at larger stresses, but also show a transition to a previously unseen linear‐viscous creep regime at lower stresses. We examine the viscosity of CO2 within the SPLD and predict that the CO2‐rich deposits are modestly stronger than previously thought. Nevertheless, CO2 ice flows much more readily than H2O ice, particularly on the steep flanks of SPLD topographic basins, allowing the CO2 to pond as observed.
    Description
    Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 47(22), (2020): e2020GL090431, doi:10.1029/2020GL090431.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Cross, A. J., Goldsby, D. L., Hager, T. F., & Smith, I. B. (2020). The rheological behavior of CO2 ice: application to glacial flow on mars. Geophysical Research Letters, 47(22), e2020GL090431.
     
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