Possible Sulfate Deposits in West Melas Chasma
NASA/JPL/University of Arizona
Possible Sulfate Deposits in West Melas Chasma
ESP_044892_1695  Science Theme: Composition and Photometry
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Melas Chasma is the widest segment of Valles Marineris, the largest canyon in the Solar System. In this region, hydrated sulfate salts have been detected, and are found extensively throughout the canyon. These salt-bearing deposits likely indicate that water was present in the past.

This image shows many interesting features that are common to Melas Chasma. At the north end, we can see typical “spur and gully” (or, ridge and trough) features that also mark the rim of the Valles Marineris throughout the canyon system. Emanating from the troughs we see debris flowing towards the bottom of the slope. The floor of the valley shows sparse exposures of bedrock, which is otherwise covered in dark rippled dunes.

Slopes in the north and south reveal layered sulfates that that were deposited into the canyon system, and subsequently eroded to reveal the layered sulfate-bearing rock. As you can see from these two images, distinguishing the various layers within the deposit would be rather difficult without high resolution color.

Written by: Eric Pilles, Livio Tornabene, Christy Caudill and Ian Pritchard (audio: Tre Gibbs)  (4 May 2016)
 
Acquisition date
23 February 2016

Local Mars time
15:08

Latitude (centered)
-10.224°

Longitude (East)
284.980°

Spacecraft altitude
260.8 km (162.1 miles)

Original image scale range
26.6 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved

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25 cm/pixel and North is up

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Equirectangular

Emission angle
7.9°

Phase angle
62.9°

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
113.1°, Northern Summer

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North azimuth:  97°
Sub-solar azimuth:  42.5°
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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.