File:Ius Chasma, Valles Marineris, Mars.jpg

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English: The Red Planet is home to Valles Marineris, the solar system's largest canyon. Within this canyon lies Ius Chasma. This image, which spans the floor of its southern trench, was taken by the Mars Reconnaissance Orbiter. The canyon is well-known for its fine stratigraphic layers modified by wind and water.

The outcrops contain interchanging layers of dark and bright rocks. The layered deposits consist of dark basalt lava flows and bright sedimentary layers. The sediments are likely to be from atmospheric dust, sand or alluvium from an ancient water source. The layers are visible on the gentle slopes above the canyon floor, in pitted areas, and in small mesa buttes. The floor of the canyon is littered with megaripples that are aligned in a north-south direction.

Ius Chasma is believed to have been shaped by a process called sapping when water seeped from the layers of the cliffs and evaporated before it reached the canyon floor. Ius Chasma also has several structural features such as east trending normal faults and grabens that deformed the canyons. Recent geomorphological events include avalanches and minor sapping from gullies that continued to erode the canyon walls.
日期
来源 NASA website; description,[1] high resolution image.[2]
作者 NASA/JPL-Caltech/Univ. of Arizona

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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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当前2008年10月5日 (日) 15:582008年10月5日 (日) 15:58版本的缩略图2,560 × 1,920(793 KB)Elipongo{{Information |Description={{en|1=The Red Planet is home to Valles Marineris, the solar system's largest canyon. Within this canyon lies Ius Chasma. This image, which spans the floor of its southern trench,m was taken by the Mars Reconnaissance Orbiter. T

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