Iani Chaos is a region ofchaos terrain at the south end of theoutflow channelAres Vallis, of theMargaritifer Sinus quadrangle (MC-19) region of the planetMars, centered at approximately ~342°E, 2°S. This is the source region of Ares Vallis. The chaotic terrain is widely believed to have formed via the removal of subsurfacewater orice, resulting in flooding at the surface, and the formation of Ares Vallis. Within Iani Chaos, deposited stratigraphically above the chaotic terrain, are smooth, low-slope, intermediate-to-light-toned deposits that are rich in a hydrated mineral that is most likelygypsum as well ashematite.[1]
Several sites in the Margaritifer Sinus quadrangle have been proposed as areas to send NASA's next major Mars rover, theMars Science Lab. Among the top 33 landing sites was Iani Chaos. A picture below shows a potential landing zone in Iani Chaos. Deposits ofhematite andgypsum have been found there.[2] Those minerals are usually formed in connection with water.
The aim of the Mars Science Laboratory is to search for signs of ancient life. It is hoped that a later mission could then return samples from sites identified as probably containing remains of life. To safely bring the craft down, a 12-mile-wide, smooth, flat circle is needed. Geologists hope to examine places where water once ponded.[2] They would like to examine sediment layers.
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