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

机译：热收缩裂纹多边形在冷沙漠河流系统中的作用

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AbstractThermal 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.
机译：摘要热收缩裂缝多边形改变了赖特谷沟壑区水的产生，运输和储存。通过将风吹雪困在多边形槽中来促进水的产生。多边形槽形成引起的冰水泥表和活动层形貌的变化改变了水的输送。储水量通过沟渠远端水流带中多边形内的沉积物粒度分布而改变。图案化的地面形态变化可以用作河流修饰的指示，从几乎未修饰的复合楔形多边形到与沟渠通道相关的多边形。热收缩裂缝的多边形也可能限制了沟壑的形成顺序，这表明在整个沟壑安置期间，赖特谷沟壑下面一直存在永久冻土。该分析提供了一个框架，用于了解在火星上观察到的多边形和沟壑之间的关系。如果可以记录可比较的地层关系，则可以推断出沟壑下存在类似的不可渗透的冰层水泥层，这表明火星沟壑流体的大气来源。

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