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File:Dunes in Abalos Undae, Mars.jpg

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English: The Abalos Undae dune field stretches westward, away from a portion (Abalos Colles) of the ice-rich north polar layered deposits that is separated from the main Planum Boreum dome by two large chasms. These dunes are special because their sands may have been derived from erosion of the Rupes Tenuis unit (the lowest stratigraphic unit in Planum Boreum, beneath the icier layers) during formation of the chasms. Some researchers have argued that these chasms were formed partially by melting of the polar ice.

The enhanced color data illuminate differences in composition. The dunes appear blueish because of their basaltic composition, while the reddish-white areas are probably covered in dust. Upon close inspection, tiny ripples and grooves are visible on the surface of the dunes; these features are formed by wind action, as are the dunes themselves.

It is possible that the dunes are no longer migrating (the process of dune formation forces dunes to move in the direction of the main winds) and that the tiny ripples are the only active parts of the dunes today.

Scale: [1]. Field of view is roughly 1.25 km x 2.2 km. Individual dunes are around 200 to 300 meters long.
日期
来源 http://www.boston.com/bigpicture/2009/11/martian_landscapes.html
作者 NASA HiRISE camera, Mars Reconnaissance Orbiter.
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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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其他版本 Geology: Dunes in Abalos Undae

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当前2014年1月26日 (日) 04:342014年1月26日 (日) 04:34版本的缩略图990 × 563(270 KB)Tillman{{Information |Description ={{en|1=The Abalos Undae dune field stretches westward, away from a portion (Abalos Colles) of the ice-rich north polar layered deposits that is separated from the main Planum Boreum dome by two large chasms. These dunes a...

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