Braided Channels West of Hecates Tholus
NASA/JPL/UArizona
Braided Channels West of Hecates Tholus
PSP_010678_2135  Science Theme: Fluvial Processes
This image shows the distal end of a set of braided channels west of Hecates Tholus. Hecates Tholus, a volcano, is located in the northern hemisphere of Mars and is the northernmost of three volcanoes within Elysium Planitia.

The Elysium volcanoes are believed to have experienced a more diverse volcanic history than that of the Tharsis volcanoes. In addition to numerous lava flow units, several observed channels have been interpreted as both volcanic and fluvial in origin.

The braided channels in this image appear to have carved into young lava flows. Like braided rivers on Earth, they consist of a network of small channels, often separated by small streamlined islands. The morphology of the channels and the fact that they are braided and have streamlined islands has led to interpretations of a fluvial rather than a volcanic origin. Although the channels are heavily mantled by fine sediments, some appear to vary in depth. This, along with the presence of multiple channels, suggests that they may represent more than one episode of fluvial activity.

The water that potentially formed the braided channels may have been released due to igneous intrusions into ground ice or to the emplacement of lava flows on ice-rich terrain. Altogether, morphologies and landforms in the surrounding area indicate extensive volcano-ground ice interactions in the past.



Written by: Maria Banks  (7 January 2009)
 
Acquisition date
05 November 2008

Local Mars time
15:38

Latitude (centered)
33.239°

Longitude (East)
148.313°

Spacecraft altitude
294.5 km (183.1 miles)

Original image scale range
59.5 cm/pixel (with 2 x 2 binning) so objects ~178 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
7.6°

Phase angle
46.9°

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
152.9°, Northern Summer

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North azimuth:  96°
Sub-solar azimuth:  354.9°
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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.