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The role of thermal contraction crack polygons in cold-desert fluvial systems

Published online by Cambridge University Press:  02 June 2008

Joseph S. Levy ,
James W. Head  and
David R. Marchant
Joseph S. Levy*
Affiliation:
Brown University Department of Geological Sciences, 324 Brook Street, Geological Sciences Box 1846, Providence, RI 02912, USA
James W. Head
Affiliation:
Brown University Department of Geological Sciences, 324 Brook Street, Geological Sciences Box 1846, Providence, RI 02912, USA
David R. Marchant
Affiliation:
Department of Earth Sciences, Boston University, 675 Commonwealth Ave, Boston, MA 02215, USA
*
*joseph_levy@brown.edu
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Abstract

Thermal contraction crack polygons modify the generation, transport, and storage of water in Wright Valley gullies. Water generation is contributed to by trapping of windblown snow in polygon troughs. Water transport is modified by changes to the ice-cement table and active layer topography caused by polygon trough formation. Water storage is modified by sediment grain-size distribution within polygons in gully distal hyporheic zones. Patterned ground morphological variation can serve as an indicator of fluvial modification, ranging from nearly unmodified composite-wedge polygons to polygons forming in association with gully channels. Thermal contraction crack polygons may also constrain the gully formation sequence, suggesting the continuous presence of permafrost beneath the Wright Valley gullies during the entire period of gully emplacement. This analysis provides a framework for understanding the relationships between polygons and gullies observed on Mars. If comparable stratigraphic relationships can be documented, the presence of an analogous impermeable ice-cemented layer beneath the gullies can be inferred, suggesting an atmospheric source for Martian gully-carving fluids.

Keywords

hyporheic zoneMcMurdo Dry Valleysmicroclimatespatterned groundpermafrost

Information

Type
Earth Sciences
Information
Antarctic Science , Volume 20 , Issue 6 , December 2008 , pp. 565 - 579
Copyright
Copyright © Antarctic Science Ltd 2008

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