Journal of Sedimentary Research
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Journal of Sedimentary Research; August 2007; v. 77; no. 8; p. 607-614; DOI: 10.2110/jsr.2007.063
© 2007 SEPM Society for Sedimentary Geology
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Sand–Water Flows on Cold-Climate Eolian Dunes: Environmental Analogs for the Eolian Rock Record and Martian Sand Dunes

Chris H. Hugenholtz1, Stephen A. Wolfe2 and Brian J. Moorman3

1 Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, T2N 1N4, Canada; chhugenh{at}ucalgary.ca
2 Natural Resources Canada, Geological Survey of Canada, Ottawa, Ontario, K1A 0E8, Canada
3 Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, T2N 1N4, Canada; Department of Geography, University of Calgary, Calgary, Alberta, T2N 1N4, Canada

Sand–water flows were observed on the slopes of cold-climate eolian dunes in southwestern Saskatchewan, Canada, during episodes of intense thawing in the winters of 2004 and 2005. Meltwater produced flows with varying grain–water contents on slopes of active blowout hollows and parabolic dunes. The sand–water flows emplaced small, structureless, lobate- and tongue-shaped deposits and alluvial fans. The greatest concentration of deposits occurred on south-facing slopes, which frequently thaw in winter from intense insolation. Transport modes ranged from high-density, viscous slurry flows to lowdensity, hyperconcentrated flows. The triggering cause of these flows is high pore-water pressure that develops in thawed nearsurface sand due to impeded infiltration by frozen sand with pore ice at depth. These observations broaden the environmental context of sand–water flows on dunes and contribute to interpretations of these deposits in the eolian rock record and to recent alluvial features observed on Martian sand dunes.






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