Dark Lava Flow in Tharsis
NASA/JPL/University of Arizona

Dark Lava Flow in Tharsis
PSP_008710_1710  Science Theme: Volcanic Processes
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This image shows a relatively dark lava flow on the Tharsis volcanic plains, east of Arsia Mons.

The entire region is composed of a thick stack of volcanic flows. The lava flow in the northern part of the image is distinctly darker than its surroundings, which are buried under a layer of dust.

Most of the image has a fluffy, blurry texture. This is the mantle of dust or volcanic ash that commonly coats volcanic regions on Mars. The dark flow is buried by this material along its southeastern boundary; it appears that the mantle is being stripped off of the flow surface. Perhaps this flow is somewhat smooth at a fine scale and traps relatively little dust.

This flow is probably young. The Western edge of the dark region does appear to be the edge of the lava flow, indicating that this flow is relatively high-standing. This could make it more exposed to the wind and allow the mantle to be stripped.

Written by: Colin Dundas   (14 August 2008)



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Acquisition date:05 June 2008 Local Mars time: 3:21 PM
Latitude (centered):-8.7 degrees Longitude (East):244.5 degrees
Range to target site:257.1 km (160.7 miles)Original image scale range:25.7 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:EQUIRECTANGULAR
Emission angle:6.7 degrees Phase angle:54.7 degrees
Solar incidence angle:59 degrees, with the Sun about 31 degrees above the horizon Solar longitude:81.2 degrees, Northern Spring
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North azimuth:97 degrees Sub-solar azimuth:41.4 degrees
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North azimuth:270 degreesSub solar azimuth:215.5 degrees

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