Sulfates in Aram Chaos
Sulfates in Aram Chaos
PSP_008311_1835  Science Theme: Composition and Photometry
This image is from Aram Chaos, a large crater connected to the Ares Vallis outflow channel. It is called “chaos” because of the rough floor topography, large slumped blocks and large fractures that may have been caused by removal of subsurface material.

The cutout is a false-color one, and the lighter-toned area is a heavily fluted and pitted capping unit. This surface tends to trap dark sand (which appears blue in false color) in the lows. We can also see the dark blue sand forming dunes below the cliff.

Sulfates have been detected in the cliff walls in some areas within Aram Chaos, as well as hematite. It has been suggested that these materials were deposited within a lake.

Written by: Joannah Metz  (11 June 2008)
Acquisition date
05 May 2008

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
274.1 km (170.4 miles)

Original image scale range
27.4 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
50°, with the Sun about 40° above the horizon

Solar longitude
67.6°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  32.7°
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IRB color
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IRB color
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Black and white
map-projected  (846MB)
non-map           (797MB)

IRB color
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non-map           (723MB)

Merged IRB
map projected  (363MB)

Merged RGB
map-projected  (373MB)

RGB color
non map           (687MB)
B&W label
Color label
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RGB: red-green-blue
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Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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NASA/JPL/University of Arizona

NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.