Hydrated Sulfate Landslides in Ophir Chasma
NASA/JPL/University of Arizona

Hydrated Sulfate Landslides in Ophir Chasma
PSP_007535_1755  Science Theme: Composition and Photometry
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Giant landslides in Ophir Chasma host a variety of geologic surfaces and mineralogies. Some possess a variety of hydrated sulfate minerals that formed in the presence of partially acidic liquid water.

This image of an ancient, approximately 3 billion year-old landslide shows two distinct surface albedos, which are proportions of reflected light. These different toned surfaces also mark a transition from one sulfate mineralogy to another and variations in surface evolution.

The upper slopes to the north are light-toned due to an abundance of hydrated sulfate minerals and bright surface dust. The surfaces that make up the southern portions of the landslide are darker in tone due to the greater frequency of dark sediment that form strings of sand drifts. Additionally, the underlying units of bedrock consist of darker minerals with less hydration then those to the north, implying a change in the ancient aqueous environments that formed them.

Written by: Matthew Chojnacki   (20 November 2013)



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Acquisition date:05 March 2008 Local Mars time: 2:52 PM
Latitude (centered):-4.328° Longitude (East):288.657°
Range to target site:271.0 km (169.4 miles)Original image scale range:27.1 cm/pixel (with 1 x 1 binning) so objects ~81 cm across are resolved
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Emission angle:6.3° Phase angle:52.7°
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