Fractured Mounds in Elysium Planitia
NASA/JPL/University of Arizona
Fractured Mounds in Elysium Planitia
PSP_003597_1765  Science Theme: Volcanic Processes
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This observation shows fractured mounds on the southern edge of Elysium Planitia.

The mounds are typically a few kilometers in diameter and about 200 feet tall. The fractures that crisscross their surfaces are dilational (extensional) in nature, suggesting that the mounds formed by localized uplift (i.e., they were pushed up from below).

The mounds are probably composed of solidified lava. They are contiguous with, and texturally similar to, the flood lavas that blanket much of Elysium Planitia, and, where dilation cracks provide cross-sectional exposure, the uplifted material is rocky.

Patches of mechanically weak and disrupted material overlie the rocky mound material. This is particularly conspicuous in the Northeast corner of the HiRISE image. These patches may be remnants of a layer that was once more continuous but has been extensively eroded. Smooth lava plains fill the low-lying areas between the mounds. They are riddled with sinuous pressure ridges. The entire area is covered by a relatively thin layer of dust and sand.

Written by: W. L. Jaeger  (8 December 2008)

This is a stereo pair with PSP_002542_1765.
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Acquisition date
03 May 2007

Local Mars time:
15:35

Latitude (centered)
-3.255°

Longitude (East)
167.902°

Range to target site
290.2 km (181.4 miles)

Original image scale range
29.0 cm/pixel (with 1 x 1 binning) so objects ~87 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
22.9°

Phase angle:
33.2°

Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
231.0°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  342.8°
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ADDITIONAL INFORMATION
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IRB: infrared-red-blue
RGB: red-green-blue
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Black & white is 5 km across; enhanced color about 1 km
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USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

POSTSCRIPT
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.